Entries |
Document | Title | Date |
20080219620 | Achieving Gaussian Outputs from Large-Mode-Area-Higher-Order Mode Fibers - A mode conversion technique to convert higher-order-mode into a nearly fundamental Gaussian shape by using a beam expander is developed and is particularly useful in high-power lasers and amplifiers. By using a beam expander between a transmitted fiber and a conventional mode conversion system, the strict lateral tolerance requirement can be overcome with high conversion efficiency. | 09-11-2008 |
20080240653 | OPTICAL COUPLER INCLUDING MODE-MIXING - A mode-mixer is used to introduce mode-mixing to an input in an optical coupler. As a result, modal noise effects are minimized in an output of the optical coupler. An example of a mode-mixer implemented includes a step index optical fiber which may or may not be coupled to a graded index optical fiber via a splice within an optical coupler. The splice may be a mechanical splice using connectors or a fused splice in some embodiments. The optical coupler may be included in a system for monitoring and/or analyzing a network. | 10-02-2008 |
20080267559 | Mode Converter - An in-fiber mode converter comprises fiber portions ( | 10-30-2008 |
20080267560 | Mode-field resizing in optical fibers - An all-fiber mode-field resizer comprises a first optical fiber configured to propagate signal light in a predetermined transverse mode along a longitudinal axis from a first input/output (I/O) port to a second I/O port. The first fiber is configured to have a first effective mode-field area and a first core V-parameter proximate the first I/O port and to have a second effective mode-field area and a second core V-parameter proximate the second I/O port. The second mode-field area is greater than the first mode-field area, and the second V-parameter is less than the first V-parameter. In one embodiment, the second V-parameter is less than approximately 1.3, and preferably less than 1.0. In another embodiment, the first V-parameter is greater than approximately 1.8. In yet another embodiment, our mode-field resizer is incorporated into a tapered fiber bundle. | 10-30-2008 |
20080267561 | Light Application and Method for Producing a Diffuser - A light applicator ( | 10-30-2008 |
20090034907 | Optical Wavelength Coupler Using Multi-Mode Interference - Provided is an optical wavelength coupler using a multi-mode interference. The optical wavelength coupler is a planar waveguide type optical device that can distribute or couple two optical signals having different wavelengths by using the multi-mode interference. The optical wavelength coupler is suitable for integration and is small-sized. Also, the optical wavelength coupler has a low manufacturing tolerance and a low loss, and is insensitive to TE/TM polarization. | 02-05-2009 |
20090041410 | Suppresson of Undesirable Signal Propagation Mode(S) Downstream of Mode Converter - An optical device (D) is dedicated to the transformation of the propagation mode of optical signals. This device comprises at least a first mode converter ( | 02-12-2009 |
20090080833 | APPARATUS AND METHODS FOR REMAKEABLE CONNECTIONS TO OPTICAL WAVEGUIDES - A single-mode optical waveguide with a core, surrounded by a cladding consisting of an inner soft layer and an outer harder layer is described. The outer layer has a grating structure on its inner surface, whose spatial frequency is the same as that of the guided mode. The thickness of the inner cladding is sufficient to keep the grating outside the mode field in undeformed regions of the waveguide, so that normally no out-coupling of the light results. Connections are made by crossing two such waveguides at an angle and pressing them together. This results in deformation of the two waveguides such that the gratings are brought into proximity with the cores. Light is coupled out of one waveguide and into the other in the deformed region, resulting in a self-aligning optical connection. The out-coupled light propagates normal to the waveguide axis, so errors in the crossing angle cause little change in efficiency. Because the cladding system is sufficiently resilient to recover after deformation, the connection is remakeable. | 03-26-2009 |
20090142019 | Low-loss bloch wave guiding in open structures and highly compact efficient waveguide-crossing arrays - Low-loss waveguide structures may comprise a multimode waveguide supporting a periodic light intensity pattern, and attachments disposed at the waveguide adjacent low-intensity regions of the light intensity pattern. | 06-04-2009 |
20090175575 | MULTIMODE OPTICAL COUPLER - A multi-mode optical coupler which includes an integrated section in which two optical fibers are fused and integrated together, at least one of these optical fibers being a multi-mode fiber, the multi-mode optical coupler coupling multi-mode light carried in the one of the multi-mode fibers to the other of the optical fibers, wherein: assuming that an outline of the integrated section in a plane view of the optical coupler is a function of a position along the longitudinal direction of the fibers, the multi-mode optical coupler has a plurality of inflection points along the outline; the multi-mode optical coupler satisfies: in an area between the farthermost inflection points includes: the length of the area between the inflection points is not more than 2 mm and an outer diameter h | 07-09-2009 |
20090208170 | OPTICAL BEAM FLATTENING USING MULTI-MODE FIBER - The present invention includes a device and method to create a light beam having substantially uniform far-field intensity. Light from a laser source is directed to at least one multimode optical fiber configured produce an intensity profile approximated by a Bessel function. | 08-20-2009 |
20090245728 | Optical coupling device - An optical mode converter has a coupling waveguide and a receiving waveguide. The coupling waveguide has at an input end a first effective refractive index and includes a tapered core of a substantially constant refractive index with a substantially square cross section at the input end, which has a size that tapers down moving away from the input end. The coupling waveguide also has a cladding at least partially surrounding the tapered core. The receiving waveguide has a second effective refractive index at an output end and includes a core of a substantially constant refractive index greater than the refractive index of the tapered core of the coupling waveguide and a cladding at least partially surrounding the core. A side surface of the tapered core of the coupling waveguide is optically in contact, in a coupling portion, with the receiving waveguide so as to allow optical coupling between the coupling waveguide and the receiving waveguide. The refractive index of the tapered core of the coupling waveguide is selected so that the first effective refractive index and the second effective refractive index differ from each other in absolute value less than 30% of the difference between the core refractive index and the effective refractive index of the receiving waveguide. | 10-01-2009 |
20090257711 | Systems and Techniques for Generating Bessel Beams - A technique is described for generating a Bessel beam. An input optical fiber is provided that supports propagation in the fundamental mode. The input fiber is connected to a fiber mode converting device that provides phase matching, at a predetermined excitation wavelength, between the fundamental mode and a selected azimuthally symmetric higher-order mode. As an input to the fiber mode converting device, a coherent light beam is fed through the input optical fiber to provide a fundamental mode input at the excitation wavelength. The fiber mode converting device resonantly excites the selected azimuthally symmetric mode. The azimuthally symmetric mode is provided as a beam output from an endface of the fiber mode converting device to approximate a Bessel beam. | 10-15-2009 |
20090274417 | Optical fiber systems for delivering short high power pulses - Described is an optical fiber system for delivering ultrashort pulses with minimal distortions due to nonlinearity. The system is based on delivering the optical pulses in a higher order mode (HOM) of a few-moded fiber. The fiber is designed so that the dispersion for the HOM is very large. This results in a dispersion length L | 11-05-2009 |
20090310913 | SEGMENTED WAVEGUIDE STRUCTURE - Segmented waveguide structures provide mode matching in planar lightwave circuits between waveguides and other waveguiding structures, e.g. slab waveguides and optical fibers. The present invention eliminates back reflections from the core segments by etching the leading and trailing faces of the core segments with a plurality of parallel facet sections, which are rearwardly offset in the transmission direction by an odd number of quarter wavelengths. | 12-17-2009 |
20090324168 | FIBER STRUCTURE AND A METHOD FOR DISCRIMINATING HIGH ORDER MODES IN THE FIBER STRUCTURE - The invention relates to a fiber structure ( | 12-31-2009 |
20100034500 | Sequentially Increasing Effective Area In Higher-Order Mode (HOM) Signal Propagation - Disclosed are multi-stage optical amplifiers that propagate higher-order mode (HOM) signals. One embodiment, among others, comprises a first segment of optical fiber in which a first HOM signal propagates, a second segment of optical fiber in which a second HOM signal propagates, and a mode converter that converts the first HOM signal into the second HOM signal. | 02-11-2010 |
20100040327 | OPTICAL WAVEGUIDE AND SPOT SIZE CONVERTER USING THE SAME - An optical waveguide includes a substrate in the shape of a flat plate; lower clad that is disposed on the substrate; and a core that is disposed on the lower clad and transmits light. The optical waveguide includes a first optical waveguide and a second optical waveguide. The first optical waveguide includes a first core on the lower clad, and is disposed so as to extend along a direction in which the light travels to a first position. The second optical waveguide includes a second core on the lower clad, is disposed so as to extend along a direction in which the light travels to a second position, and has a lower relative refractive index difference than the first optical waveguide. The first optical waveguide and the second optical waveguide form, between the first position and the second position, a layer structure where the first core and the second core are disposed such that the first core is positioned a predetermined distance away from the second core in a direction perpendicular to the substrate. At least either the first optical waveguide or the second optical waveguide includes a mode coupling section and a mode conversion section. The mode coupling section includes a directional coupler to conduct the mode coupling of the first core and the second core between the first position and the second position. The mode conversion section is connected to the mode coupling section, and has a tapered core structure to adjust the mode diameter of the first core to the mode diameter of the second core. | 02-18-2010 |
20100046887 | Optical Fibre Transmission - Optical radiation is applied to a multimode optical fibre, either from another fibre or from a laser, in such a way as to control the mode distribution in the multimode optical fibre. The mode distribution is selected in such a way as to improve performance, for example to avoid transmission nulls or to reduce noise due to reflections back to a laser. | 02-25-2010 |
20100054661 | Production of optical pulses at a desired wavelength utilizing higher-order-mode (HOM) fiber - An apparatus and method for producing optical pulses of a desired wavelength utilizes a section of higher-order-mode (HOM) fiber to receive input optical pulses at a first wavelength, and thereafter produce output optical pulses at the desired wavelength through soliton self-frequency shifting (SSFS) or Cherenkov radiation. The HOM fiber is configured to exhibit a large positive dispersion and effective area at wavelengths less than 1300 nm. | 03-04-2010 |
20100098377 | LIGHT CONFINEMENT USING DIFFUSERS - An illumination structure includes a waveguide, a discrete light source embedded within the waveguide, and a mode-conversion reflector. The mode-conversion reflector converts at least some unconfined modes from the light source into confined modes that propagate fully within the waveguide. | 04-22-2010 |
20100129029 | Optical fiber mode couplers - Described are optical devices and related methods wherein a multiple mode input in a Higher Order Mode (an HOM) optical fiber is converted by a complex mode transformer to produce a fundamental mode output in an optical medium with an E-field that is substantially different than that exiting the HOM optical fiber. The medium is preferably a Large Mode Area (LMA) optical fiber, or free space. The mode transformer may be a series of refractive index perturbations created either by photo-induced gratings or by gratings formed by physical deformations of the optical fiber. | 05-27-2010 |
20100142890 | +Cylindrical Polarization Beams - Generation of a cylindrically polarized light beam, and in particular, a hybrid-azimuthal-radial polarization beams, called HARP modes, generated from an input linearly polarized Gaussian beam using a spun optical waveguide device is taught. The HARP modes are comprised of hybrid-azimuthal polarization (HAP) and hybrid-radial polarization (HRP) superposition modes. These beams possess a non-zero local angular momentum density that is spatially varying and a zero total angular momentum. | 06-10-2010 |
20100158438 | Fiber Optic Diffraction Grating - The present invention is directed to an optical fiber grating having a core, that is capable of controlling the light signal transmission therethrough by causing at least one of: at least one spectral peak, and/or at least one spectral dip in its core light transmission spectrum, corresponding to at least one predetermined wavelength. The inventive optical fiber diffraction grating comprises at least one longitudinally positioned structural element of a predetermined geometric profile and that is configured for diffracting a portion of the transmitted light signal at at least one predefined wavelength thereof, from at least one core mode into at least one of: at least one cladding mode and/or at least one radiating mode. Various embodiments of a number of novel techniques for fabrication of the inventive optical fiber diffraction grating are provided, inclusive of a novel technique for fabricating the inventive grating from a single material. Advantageously, such novel fabrication techniques rely on configuration of a desired geometric profile for the at least one structural element portion of the novel grating, each profile comprising a number of readily configurable parameters that can be selected and/or adjusted during fabrication, to produce a variety of novel fiber diffraction gratings, each having a corresponding specific desirable core transmission spectrum having at least one of: least one spectral peak, and/or at least one spectral dip therein, corresponding to at least one specific desired wavelength, dependent on the configuration of the applicable geometric profile. | 06-24-2010 |
20100158439 | OPTICAL MICRORESONATOR - An optical device and a sensor system incorporating same are disclosed. The optical device includes a microresonator that has a core with input and output ports. The output port is different than the input port. The optical device further includes first and second optical waveguides. Each optical waveguide has a core with input and output faces. The output face of the core of the first optical waveguide physically contacts the input port of the core of the microresonator. The input face of the core of the second optical waveguide physically contacts the output port of the core of the microresonator. | 06-24-2010 |
20100189391 | MULTIMODE OPTICAL COMBINER AND PROCESS FOR PRODUCING THE SAME - A multimode optical combiner constituted by first and second multimode optical waveguides. The first multimode optical waveguide includes optical waveguide portions and a near-end portion having a single core and an output end. The optical waveguide portions are arranged in a bundle so that none of the at least six optical waveguide portions is located in the center of the bundle. The second multimode optical waveguide has an input end connected to the output end of the first multimode optical waveguide. The numerical aperture NA | 07-29-2010 |
20100189392 | MONOLITHIC SIGNAL COUPLER FOR HIGH-ASPECT RATIO SOLID-STATE GAIN MEDIA - A coupler and method of coupling a signal beam between from a circular-core fiber to a rectangular-core cross section fiber includes providing an optical coupler having an optical core with a high-aspect ratio cross section at one end and a circular cross section at an opposite end to receive a signal beam having a circular cross section. The signal beam is propagated from the circular fiber to the rectangular-core cross section fiber in a narrow, fast-axis direction while maintaining the size and divergence of the signal beam as it propagates. The signal beam is expanded in size while producing a collimated beam from the circular cross section end to the rectangular-core cross section end in a wide, slow-axis direction. | 07-29-2010 |
20100209044 | Adiabatic coupler for coiled optical fiber devices - An optical fiber coupler is formed of a section of optical fiber that is positioned between a conventional input fiber (for example, a single mode fiber) or waveguide and a coiled optical fiber device. The adiabatic coupler is coiled (or, at least, curved) to assist in transforming a conventional fundamental mode optical signal propagating along the longitudinal axis of the input fiber to an optical signal that is shifted into a peripheral region of the coiled optical fiber. Moreover, the pitch of an inventive coiled optical fiber coupler can be controlled to assist in the adiabatic transformation process. | 08-19-2010 |
20100226608 | MULTIMODE INTERFERENCE COUPLER FOR USE WITH SLOT PHOTONIC CRYSTAL WAVEGUIDES - The present invention provides an optical apparatus having a multimode interference coupler configured to optically couple a strip waveguide to a slot photonic crystal waveguide. The multimode interference coupler has a coupling efficiency to the slot photonic crystal waveguide greater than or equal to 90%, a width that is approximately equal to a defect width of the slot photonic crystal waveguide, a length that is equal to or less than 1.5 μm, and interfaces with the slot photonic crystal waveguide at an edge of a period that gives a termination parameter of approximately zero. The optical apparatus may also include an insulation gap disposed between the multimode interference coupler and the slot photonic crystal waveguide, wherein the length of the multimode interference coupler is reduced by approximately one half of a width of the insulation gap. | 09-09-2010 |
20100232745 | IMPROVEMENTS RELATING TO WAVEGUIDES - A waveguide comprising photonic crystal fibre terminated by a re-imaging device. The re-imaging device may, for example, be a length of multimode fibre. Connectors for such waveguides are also disclosed. A method of attaching a connector to a photonic crystal fibre is also disclosed. The method comprises terminating the photonic crystal fibre by splicing multimode fibre onto an end of the photonic crystal fibre to form a terminated photonic crystal fibre end, locating a ferrule on the terminated photonic crystal fibre such that there is a predetermined length of multimode fibre between the splice and the output end of the ferrule, and locating the ferrule within a connector body. | 09-16-2010 |
20100247036 | FLAT-TOP RESPONSE ARRAYED WAVEGUIDE GRATING - An optical system is disclosed. The optical system includes first and second waveguides, a first dispersive element, and a coupler. The first waveguide is configured to support a first mode and a second mode of an optical input signal. The second mode being of a higher order than the first mode. The second waveguide has an input and an output and is configured to receive a portion of the optical input signal. The first dispersive element is disposed along a length of one of the first or second waveguides. The first dispersive element including a waveguide segment configured to induce a frequency-dependent phase shift in one of the portions of the optical input signal. The coupler is configured to couple the portion of the optical input signal in the second waveguide and the portion optical input signal in the first waveguide into the first waveguide. The coupling excites the second mode of the first waveguide to create a multimode optical signal. | 09-30-2010 |
20100247037 | OPTICAL MODE COUPLER - An optical coupler includes a first waveguide configured to supply a first optical signal having a wavelength and a second waveguide. The first optical signal having a first mode. The first waveguide has a tapered portion being spaced from the second waveguide by a distance sufficient to facilitate evanescent coupling of the first optical signal from the first waveguide to the second waveguide. A first effective refractive index of the first waveguide at a location in the tapered portion being equal to a second effective refractive index at a location in the second waveguide. The first effective refractive index being associated with the first mode and the second effective refractive index being associated with a second mode of a second optical signal having the wavelength. The second mode having a different order than the first mode, and the second waveguide being configured to supply the second optical signal. | 09-30-2010 |
20100254653 | Multimode Fiber - A multimode optical fiber comprises a central core having an alpha profile, a depressed cladding having a portion in continuity with the alpha profile of the central core and a stepped portion, and an outer cladding. The alpha profile is obtained by co-doping at least two dopants. The variation in concentration of each dopant and its derivative in relation to the fiber radius are continuous. A multimode fiber for Ethernet optical system with an improved bandwidth is thus obtained. | 10-07-2010 |
20100290738 | Mode Scrambling Apparatus for Multimode Fiber - Apparatus and methods for scrambling optical modes in multimode fibers to achieve uniform light distribution in guided multi-mode light for various applications. | 11-18-2010 |
20100296774 | Method and Device For Suppressing High-Order Modes In MM Fibers - A laser system includes a multimode fiber (MMF) having a permanent perturbation region which is provided at the predetermined distance from the upstream end of the MMF. The perturbation region is configured so that propagating fundamental and at least one high-order mode (HOM) originated upstream from the perturbation region are split into multiple HOMs which are substantially in counterphase. Hence, the HOMs destructively interfere with and substantially cancel one another. | 11-25-2010 |
20100322555 | Grating Structures for Simultaneous Coupling to TE and TM Waveguide Modes - Disclosed are an integrated optical coupler, and a method of optically coupling light, between an optical element and at least one integrated optical waveguide. The optical coupler includes a grating structure and is adapted for coupling light to waveguide modes with different polarization with low polarization dependent loss. For example, polarization dependent loss may be smaller than 0.5 dB. The waveguide modes may include a Transverse Electric (TE) waveguide mode and a Transverse Magnetic (TM) waveguide mode. The optical coupler may further include a two-dimensional grating structure adapted for providing polarization splitting for a first optical signal of a first predetermined wavelength and for coupling both polarizations forward or backward. | 12-23-2010 |
20100322556 | WAVEGUIDE TYPE OPTICAL DEVICE - An arrayed waveguide grating optical multiplexer/demultiplexer according to the present invention including an input channel waveguide, an input slab waveguide, an arrayed waveguide, a polarization dependence eliminating means, an output slab waveguide, a temperature compensating means, and an output channel waveguide is characterized in that the temperature compensating means compensates for the temperature dependence of the optical path lengths in the channel waveguides of the arrayed waveguide, and the polarization dependence eliminating means eliminates the temperature dependence and the polarization dependence of the arrayed waveguide grating optical multiplexer/demultiplexer at the same time. | 12-23-2010 |
20110026879 | FABRICATION-TOLERANT WAVEGUIDES AND RESONATORS - An optical waveguide having a core region with a substantially rectangular cross-section with a selected aspect ratio of width to height. Embodiments include devices incorporating the optical waveguide and methods for using the optical waveguide. | 02-03-2011 |
20110026880 | OPTICAL MODE TRANSFORMER, IN PARTICULAR FOR COUPLING AN OPTICAL FIBER AND A HIGH-INDEX CONTRAST WAVEGUIDE - A semiconductor-based optical mode transformer ( | 02-03-2011 |
20110044580 | METHOD AND APPARATUS FOR PROVIDING A LINEAR PHASE MODE-MATCHED LAUNCH OF LIGHT INTO AN END OF A MULTIMODE OPTICAL FIBER - A method and an apparatus are provided for launching light into an entrance facet of a multimode optical fiber (MMF) of an optical link in a way that excites one or more higher-order Hermite Gaussian (HMG) mode groups in the MMF. Exciting higher-order HMG mode groups in the MMF increases the bandwidth of the link while also providing reduced modal noise. In addition, selectively exciting one or more higher-order HMG mode groups in the MMF ensures that the launch will provide desirable results even in cases where the connector that connects the end of the MMF to the optical transceiver or transmitter is offset with respect to the receptacle of the optical transceiver or transmitter. This feature allows for greater manufacturing tolerances when manufacturing the connectors and receptacles because precise alignment between them is not critical to achieving a successful launch. | 02-24-2011 |
20110058769 | All-Fiber Module for Femtosecond Pulse Compression And Supercontinuum Generation - An all-fiber optical pulse compression arrangement comprises a concatenated arrangement of a section of input fiber (e.g., a single mode fiber), a graded-index (GRIN) fiber lens and a section of pulse-compressing fiber (e.g., LMA fiber). The GRIN fiber lens is used to provide mode matching between the input fiber (supporting the propagation of chirped optical pulses) and the pulse-compressing fiber, with efficient pulse compression occurring along the length of the LMA fiber. The dispersion and length of the LMA fiber section are selected to provide the desired degree of pulse compression; for example, capable of reconstituting a femtosecond pulse as is used in supercontinuum generation systems. | 03-10-2011 |
20110075969 | Apparatus and Methods for Attenuating and Measuring Light Passed Through a Launch Multimode Fiber - An exemplary apparatus includes ferrule offset assemblies each having opposing ferrules with respective ends and respective fiber channels maintained in general relative and adjustable alignment. Offset adjusting devices adjust the relative alignment of the fiber channels to create at least one select fiber channel alignment offset. Respective multimode fibers are disposed in the fiber channels and have a fiber alignment corresponding to the fiber channel alignment. One of the multimode fibers has an end configured to optically couple to a launch multimode fiber, which is connected to a device having a light source. The multimode fiber receives light from the launch multimode fiber so that at least some of the light passes through to the other multimode fiber and then to a power meter. Power measurements for different fiber offsets are then compared to established attenuation values. | 03-31-2011 |
20110091154 | Connecting structure and method able to make the signals transmit between multi-mode and single-mode fibers - A connection structure and a method are provided for being able to make the signal of multi-mode fiber accepted by the single-mode fiber or to make the signal of single-mode fiber accepted by the multi-mode fiber. The present invention uses the core of the cladding of the single-mode fiber corresponding to that of multi-mode fiber in end-to-end relationship or uses the cladding of the single-mode fiber connects with that of multi-mode fiber in side-to-side relationship. Therefore, for users, it will not be necessary to use light-electricity converter between single-mode fiber and multi-mode fiber. In this way, the present invention can help to save the material cost and simplify the arrangement of the transmission line. | 04-21-2011 |
20110116741 | OPTICAL MODE TRANSFORMER, IN PARTICULAR FOR COUPLING AN OPTICAL FIBER AND A HIGH-INDEX CONTRAST WAVEGUIDE - An optical mode transformer comprises a first waveguide including a first core, a first cladding and an end facet configured to be coupled to an optical fiber. The transformer further includes a second waveguide comprising a second core, a second cladding and an end directly coupled to an end of the first waveguide. A third waveguide comprises a third core and a third cladding, and is arranged with respect to the second waveguide so as to realize an evanescent optical coupling with the second waveguide. The third core includes a tapered region wherein evanescent coupling takes place, and wherein a refractive index contrast of the first waveguide is less than a refractive index contrast of the second waveguide, the refractive index contrast of the second waveguide is less than a refractive index contrast of the third waveguide, and the refractive index contrast of the third waveguide is not less than 18%. | 05-19-2011 |
20110116742 | COUPLED WAVEGUIDE PHOTO DETECTOR - An embodiment of the invention provides a coupled waveguide photo detector device. Optically, the device includes an input waveguide. An output waveguide is coupled to the input waveguide with a nonuniform coupling coefficient in a coupling section. An absorber is included in the coupling section to convert an absorbed portion of optical radiation into photo current. The location of absorber and the optical radiation intensity pattern in the coupling section are set to control the maximum intensity of output power absorbed by the output waveguide to be within a predetermined limit that avoids saturation. The absorber is also part of a transmission line collector which has a phase and group velocity to match those of the optical wave in the coupling section such that currents collected by the transmission line collector add in phase as the optical wave propagates in the output waveguide. | 05-19-2011 |
20110158584 | LOW-LOSS BLOCH WAVE GUIDING IN OPEN STRUCTURES AND HIGHLY COMPACT EFFICIENT WAVEGUIDE-CROSSING ARRAYS - Low-loss waveguide structures may comprise a multimode waveguide supporting a periodic light intensity pattern, and attachments disposed at the waveguide adjacent low-intensity regions of the light intensity pattern. | 06-30-2011 |
20110164847 | MULTIMODE INTERFERENCE COUPLER AND METHOD FOR THE STRUCTURAL CONFIGURATION THEREOF - A multimode interference coupler includes at least one supply waveguide and at least one output waveguide, wherein the coupler has along its longitudinal extent in the direction of the supply waveguide at least one longitudinal section in which the refractive index has a locally oscillating profile in a direction running substantially at right angles to the direction of the supply waveguide. A method for the structural configuration of such a multimode interference coupler. | 07-07-2011 |
20110194813 | BEND INSENSITIVITY IN SINGLE MODE OPTICAL FIBERS - An optical fiber that is relatively insensitive to bend loss comprises a core region and a cladding region configured to support and guide the propagation of light in a fundamental transverse mode, the cladding region including (i) an outer cladding region having a refractive index less than that of the core region, (ii) an annular cladding pedestal region having a refractive index higher than that of the outer cladding region and comparable to that of the core region, and (iii) an annular cladding inner trench region disposed between the core region and the pedestal region, the inner trench region having a refractive index less than that of the outer cladding region. In one embodiment, the fiber also includes a (iv) an annular cladding outer trench region disposed between the pedestal region and the outer cladding region, the outer trench region having a refractive index less than that of the outer cladding region. In addition, to suppress HOMs the pedestal region is configured to resonantly couple at least one other transverse mode of the core region to at least one transverse mode of the pedestal region. Such fiber is advantageously used as access fiber, but may have other applications, such as sensor fiber. | 08-11-2011 |
20110194814 | BEND INSENSITIVITY IN SINGLE MODE OPTICAL FIBERS - An optical fiber that is relatively insensitive to bend loss comprises a core region and a cladding region configured to support and guide the propagation of light in a fundamental transverse mode, the cladding region including (i) an outer cladding region having a refractive index less than that of the core region, (ii) an annular cladding pedestal region having a refractive index higher than that of the outer cladding region and comparable to that of the core region, and (iii) an annular cladding inner trench region disposed between the core region and the pedestal region, the inner trench region having a refractive index less than that of the outer cladding region. In one embodiment, the fiber also includes a(iv) an annular cladding outer trench region disposed between the pedestal region and the outer cladding region, the outer trench region having a refractive index less than that of the outer cladding region. In addition, to suppress HOMs the pedestal region is configured to resonantly couple at least one other transverse mode of the core region to at least one transverse mode of the pedestal region. Such fiber is advantageously used as access fiber, but may have other applications, such as sensor fiber. | 08-11-2011 |
20110211788 | OPTICAL FIBER AND OPTICAL COMMUNICATION SYSTEM INCLUDING SAME - The invention relates to an optical fiber employable in an optical communication system using Raman amplification and adapted to improve OSNR and suppress bending loss at the same time, and the like. The optical fiber is a silica-based optical fiber having a depressed refractive index profile constituted by at least a core, an inner cladding having a low refractive index, and an outer cladding, an effective area A | 09-01-2011 |
20110217001 | HIGHLY NONLINEAR OPTICAL WAVEGUIDE STRUCTURE WITH ENHANCED NONLINEARITY AND MECHANICAL ROBUSTNESS - There is described an optical waveguide structure exhibiting nonlinear properties, a method of fabricating such, and an optical coupling device made of two of such optical waveguide structures. The optical waveguide structure comprises an optical waveguide portion made of a light transmitting material for supporting a light mode traveling therein. The light transmitting material has an intrinsic nonlinearity parameter suitable for inducing a nonlinearity on the light mode, and the optical waveguide portion having a diameter sized to securely confine the light mode therein and to increase the nonlinearity on the light mode. The optical waveguide structure also has a coating surrounding the optical waveguide portion to mechanically support or to protect the optical waveguide portion from surface damage. | 09-08-2011 |
20110217002 | Method and System for Waveguide Mode Filters - A method and system for waveguide mode filters are disclosed and may include processing optical signals of a fundamental mode and higher-order modes by filtering the higher-order modes in rib waveguides in a photonic chip. The higher-order modes may be filtered utilizing doped regions and/or patterns in one or more slab sections in the rib waveguides. The patterns may be periodic or aperiodic along the rib waveguides. The higher-order modes may be filtered utilizing varying widths of slab sections, or doped, patterned, and/or salicided ridges on the slab sections in the rib waveguides. The higher-order modes may be attenuated by scattering and/or absorbing the modes. The chip may comprise a CMOS photonic chip. | 09-08-2011 |
20110229074 | OPTICAL WAVEGUIDE DEVICE AND OPTICAL RECEIVER WITH SUCH OPTICAL WAVE GUIDE DEVICE - An optical waveguide device includes two input channels, a plurality of output channels, and a multi-mode interference coupler having one end part coupled to the two input channels and the other end part coupled to the plurality of output channels, the multi-mode interference coupler has a pair of opposite side parts, the multi-mode interference coupler has a width defined by the pair of opposite side parts and the width gradually increases from one end part to the other end part, and the two input channels are asymmetrically coupled to the one end part with respect to the center axis in the width direction. | 09-22-2011 |
20110235968 | MULTIMODE OPTICAL COUPLER INTERFACES - Optical interfaces that may be employed between large-core optical fibers and chip-scale optoelectronic devices. Described herein are couplers that improve the tolerance of misalignment when a single mode (SM) fiber is used as waveguide input. This enables the possibility of passive/automatic alignment and therefore reduces the production cost. The coupler also serves as a spot-size converter that reduces the spot size and is suitable for applications where a waveguide mode with small cross-section area is of particular importance. One such example can be a waveguide-based SiGe or III-V semiconductor photodetector in which the vertical size of its waveguide mode should be as small as few microns. | 09-29-2011 |
20110235969 | OPTICAL FIBER-TYPE OPTICAL FILTER - An optical fiber-type optical filter includes: two fiber regions, namely, the first and second PBGF regions, each of which includes: a core section extending in a waveguide direction of incident light; and a clad section extending in the waveguide direction and surrounding the core section, wherein the clad section includes a plurality of high rods which have a refractive index higher than that of a base material of the clad section, extend in the waveguide direction, and are arranged periodically in a cross section perpendicular to the waveguide direction, and a light loss region between mutually-facing end surfaces of the first and second fiber regions, for coupling a radiation mode with a waveguide mode in which light intensity is observed in the high refractive-index sections in the clad section. | 09-29-2011 |
20110235970 | QUAD OPTICAL TIME DOMAIN REFLECTOMETER (OTDR) - An optical device that includes a first laser source, a multimode coupler optically connected to the first laser source, a first test port optically connected to the multimode coupler, a second laser source, a singlemode coupler optically connected to the second laser source, a second test port optically connected to the singlemode coupler, a photodetector, and a multimode/singlemode combiner optically connected to the multimode coupler, singlemode coupler and photodetector. | 09-29-2011 |
20110243498 | System and Method for Generating an Optical Vector Vortex Beam - Optical vector vortex beams may be generated from few-mode or multi-mode optical fiber by introducing linearly or circularly polarized light into the fiber. By adjusting at least one of the polarization of the light, the incident angle of the light coupled into the fiber, and the length of the fiber, one or more vector modes supported by the fiber may be selected. The resulting output from the fiber may be a vortex beam that can be collimated and used for precise manipulation of objects on order of a micrometer or a nanometer in diameter. | 10-06-2011 |
20110305416 | METHOD AND SYSTEM FOR MULTI-MODE INTEGRATED RECEIVERS - A method and system for multi-mode integrated receivers are disclosed and may include receiving an optical signal from an optical fiber coupled to a chip comprising a photonic circuit. The photonic circuit may comprise an optical coupler, one or more multi-mode optical waveguides, and a detector. The received optical signal may be coupled to a plurality of optical modes in the one or more multi-mode optical waveguides, which are communicated to a detector to generate an electrical signal from the communicated modes. The optical coupler may comprise a grating coupler. The chip may comprise a CMOS chip, and the optical fiber may comprise a single-mode or a multi-mode fiber. The detector may comprise a germanium or silicon-germanium photodiode, and/or a waveguide detector. The optical fiber may be coupled to a top surface of the chip and the multi-mode optical waveguides may comprise rib waveguides. | 12-15-2011 |
20120033914 | ANGLED COUPLING FOR OPTICAL FIBERS - An angled coupling for optical fibers can comprise a body ( | 02-09-2012 |
20120039566 | POLARISATION ROTATOR WITH MULTIPLE BOWTIE-SHAPED SECTIONS - Polarisation rotator by β° between an input and an output waveguide formed by interposing between the input and output waveguides at least to parallepiped-shaped sections in which a bowtie-shaped cut-out has been made, presenting two axes of symmetry, one along a longitudinal axis and another along a transverse axis, that is defined by a series of precise constructive parameters and has its longitudinal axis at an angle with respect to the axis of one of the input and output waveguides, wherein the sections are constructively identical by twos. | 02-16-2012 |
20120063720 | OPTICAL FIBER ASSEMBLY AND METHODS OF MAKING THE SAME - In some embodiments, an optical fiber assembly apparatus includes a signal fiber having a substantially constant outer diameter, a proximal portion, and a distal portion. The proximal portion has a waveguide structure configured to propagate an optical signal having a first mode field diameter and the distal portion has a waveguide structure configured to propagate the optical signal having the first mode field diameter at a proximal end of the distal portion and has an expanded waveguide structure configured to propagate the optical signal having a second mode field diameter at a distal end of the distal portion. The optical fiber assembly includes a lens fiber having a proximal end. The proximal end of the lens fiber is fused to the distal end of the distal portion of the signal fiber. The lens fiber is configured to propagate an optical signal through a nominally homogenous region. | 03-15-2012 |
20120093461 | Production of Optical Pulses At A Desired Wavelength Utilizing Higher-Order-Mode (HOM) Fiber - An apparatus and method for producing optical pulses of a desired wavelength utilizes a section of higher-order-mode (HOM) fiber to receive input optical pulses at a first wavelength, and thereafter produce output optical pulses at the desired wavelength through soliton self-frequency shifting (SSFS) or Cherenkov radiation. The HOM fiber is configured to exhibit a large positive dispersion and effective area at wavelengths less than 1300 nm. | 04-19-2012 |
20120121220 | METHOD AND DEVICE FOR TRANSMISSION OF OPTICAL DATA BETWEEN TRANSMITTER STATION AND RECEIVER STATION VIA OF A MULTI-MODE LIGHT WAVE GUIDE - The invention relates to a method for transmitting optical information between an emitter station ( | 05-17-2012 |
20120128299 | Optical Apparatus Having Improved Resistance To Thermal Damage - An optical assembly is provided that can mitigate thermal damage that could otherwise occur in the region near where the optical fiber emerges from a high-power optical device package. The optical assembly includes an optical medium to guide stray light, along the fiber axis but substantially outside of the fiber core, from the interior to the exterior of a housing. The assembly further includes a transition region external to the housing, where at least one optical mode guided by the optical medium transitions to at least one optical mode confined by a polymer coating as a guided mode of the cladding. In embodiments, the optical medium is provided by the fiber cladding together with overlying materials of relatively low refractive index that help to confine the stray light within the cladding. | 05-24-2012 |
20120134623 | RIDGE WAVEGUIDE SERIAL INTERFEROMETERS - In a ridge waveguide serial interferometer mode conversion is induced by a first mode conversion section, a phase difference between modes is introduced by propagation over a length of waveguide and optical interference is produced following further mode conversion induced in a second mode conversion section. The first mode conversion section has a first radius of curvature, which is equal to a second radius of curvature of the second mode conversion section. The ridge waveguide interferometer advantageously provides an equal phase dependency as a function of temperature. | 05-31-2012 |
20120170889 | Mode Converter - Provided is a mode converter capable of efficiently coupling or emitting light having a single-peaked spot, and has high flexibility of the shape to be easily manufactured. The mode converter is formed of multiple single-mode waveguides optically coupling areas | 07-05-2012 |
20120195549 | Broad-Bandwidth Optical Fiber - The present invention embraces an optical fiber that includes a central core having an alpha refractive index profile with respect to an outer optical cladding. The optical fiber also includes an inner cladding and a buried trench. The central core includes a core matrix doped with at least fluorine and a dopant element that increases refractive index. The optical fiber typically has reduced bending losses and cladding effect as well as a high bandwidth at the wavelengths of 850 nanometers and 1300 nanometers for high-data-rate applications. | 08-02-2012 |
20120201495 | High Power Fiber Laser System with High Quality Beam - A high power fiber laser system has a combiner configured of a plurality of single mode (SM) fibers which are fused together so as to define an output end of the fiber combiner. The fused SM fibers radiate respective fiber outputs, which collectively define a multimode (MM) combiner output. The SM fibers each are configured with such an optimally small numerical apertures (NA) that the MM combiner output is characterized by a minimally possible beam quality factor (M | 08-09-2012 |
20120224806 | MULTI-MODE INTERFEROMETER TECHNIQUES - Technologies are generally described for techniques useful in an interferometer system. In some examples, a system may include a first waveguide effective to propagate a first wave in a first mode. In some examples, the system may include a second waveguide effective to, in response to the first wave, propagate second and third waves in second and third modes, respectively. In some examples, the second waveguide may be effective to reflect the second and third waves off a reflection surface to produce first, second, third and fourth reflected waves. In some examples, the second waveguide may be effective to propagate the first and third reflected waves in the second mode and propagate the second and fourth reflected waves in the third mode. | 09-06-2012 |
20120224807 | INTRA-LINK SPATIAL-MODE MIXING IN AN UNDER-ADDRESSED OPTICAL MIMO SYSTEM - The outage probability in an under-addressed optical MIMO system may be reduced by configuring an intra-link optical mode mixer to dynamically change the spatial-mode mixing characteristics of the link on a time scale that is faster than the channel coherence time. Provided that the MIMO system employs an FEC code that has a sufficient error-correcting capacity for correcting the amount of errors corresponding to an average state of the MIMO channel, this relatively fast dynamic change tends to reduce the frequency of events during which the number of errors per FEC-encoded block of data exceeds the error-correcting capacity of the FEC code. | 09-06-2012 |
20120281947 | System And Method For Coupling A Multi-Mode Optical Fiber To A Single Mode Optical Fiber - A multi-mode to single mode optical interface device includes an optically pumped edge emitting semiconductor laser device and a lens. The optically pumped edge emitting semiconductor laser device includes (1) a gain area, and (2) an edge located single mode output. The lens focuses a multi-mode optical fiber output beam into a substantially line shaped output beam focused onto the gain area of the optically pumped edge emitting semiconductor laser device. A method for converting a multi-mode optical signal into a single mode optical signal includes (1) focusing the multi-mode optical signal onto a gain area of an optically pumped edge emitting semiconductor laser using at least a line focusing lens, and (2) converting the multi-mode optical signal into the single mode optical signal using the semiconductor laser. | 11-08-2012 |
20120281948 | ALL-FIBER LOW MODE BEAM COMBINER FOR HIGH POWER AND HIGH BEAM QUALITY - A low mode beam combiner ( | 11-08-2012 |
20120301075 | Photonic crystal band-shifiting device for dynamic control of light transmission - An active device for dynamic control of lightwave transmission properties has at least one photonic crystal waveguide that has anti-reflection photonic crystal waveguides with gradually changed group refractive indices at both input and output side. An alternating voltage or current signal applied to two electrically conductive regions changes the refractive indices of the photonic crystal materials, introducing a certain degree of blue-shift or red-shift of the transmission spectrum of the photonic crystal waveguide. The output lightwave with frequency close to the band-edge of the photonic crystal waveguide is controlled by the input electric signal. Devices having one or more such active photonic crystal waveguides may be utilized as an electro-optic modulator, an optical switch, or a tunable optical filter. | 11-29-2012 |
20120308180 | Quad Small Form Factor Plus Pluggable Module for Medium Range Single Mode Fiber Applications - An apparatus is provided comprising a small form factor pluggable module having an optical connector configured to be coupled to a plurality of transmit and receive single mode optical fibers and an optical transmitter comprising a plurality of uncooled laser diodes configured to transmit optical signals to a plurality of transmit single mode optical fibers via the optical connector. The small form factor pluggable module is a quad small form factor pluggable plus (QSFP+) 40GBASE-SR4 module that has been converted for use with single mode fibers by substituting their vertical-cavity surface emitting laser diodes (VCSEL) with longer range uncooled laser diodes. Example replacement lasers may include uncooled Fabry-Perot (FP) laser diodes or Distributed Feedback (DFB) laser diodes. To connect the module to lower grade fibers, a single mode-to-multimode mode conditioning patch cord is provided with a plurality of inline physical offsets, one for each pair of fibers. | 12-06-2012 |
20130028557 | PRACTICAL SILICON PHOTONIC MULTI-FUNCTION INTEGRATED-OPTIC CHIP FOR FIBER SENSOR APPLICATIONS - This patent disclosure is based on silicon instead of LiNbO | 01-31-2013 |
20130034326 | Single Mode High Power Fiber Laser System - A monolithic fiber has a double bottleneck-shaped core configured with opposite uniformly configured end regions, frustoconical transformer regions which run inwards from the respective end regions, and a central uniformly-dimensioned region which bridges the transformer regions. The core is configured as a multimode core or single-mode core and capable of guiding a single transverse mode between the end regions without splice losses. | 02-07-2013 |
20130094806 | OPTICAL SIGNAL CONVERSION METHOD AND APPARATUS - An optical adapter includes an optical coupler, a plurality of fiber optic cables and an optical wavelength conversion device. The optical coupler is operable to receive a plurality of multi-mode single-wavelength optical signals having the same frequency. The plurality of fiber optic cables are arranged in parallel and each have a first end connected to the optical coupler and the other end is coupled to the optical wavelength conversion device. The optical wavelength conversion device is operable to optically convert between the plurality of multi-mode single-wavelength optical signals at the same frequency and a plurality of single-mode optical signals at different frequencies and multiplex the plurality of single-mode optical signals at the different frequencies onto a single-mode multi-wavelength optical waveguide. A corresponding optical adapter is provided for the receive side. | 04-18-2013 |
20130188910 | OPTICAL CONVERSION ELEMENT AND OPTICAL CONVERSION ELEMENT MANUFACTURING METHOD - Disclosed is an optical conversion element capable of highly efficient optical coupling between a silicon waveguide and a general single-mode optical fiber only by butt-coupling without requiring anti-reflective coating. One embodiment is an optical conversion element that includes a waveguide structure and converts a mode field of guided light and is characterized in that at least a dual core is included, an innermost core of the dual core is a silicon inverse tapered thin wire core, a first outer core is a forward tapered ridge core having a ridge structure formed of an oxide film with only width of the ridge core changing. The first outer core is positioned on a narrow width side of the innermost core. | 07-25-2013 |
20130209033 | Coupling between optical devices - A base device has a first waveguide positioned on a first base. The waveguide is at least partially defined by a ridge extending away from the first base. An auxiliary optical device has a second waveguide positioned on a second base. The second optical device is immobilized on the base device such that the second waveguide is between the first base of the first optical device and the second base of the auxiliary device. The first waveguide is optically aligned with the second waveguide such that the first waveguide and second waveguides can exchange optical signals. | 08-15-2013 |
20130216181 | MODE DELAY MANAGED FEW MODED OPTICAL FIBER LINK - An optical fiber link suitable for use in a mode division multiplexing (MDM) optical transmission system is disclosed. The link has a first optical fiber having a core which supports the propagation and transmission of an optical signal with X LP modes at a wavelength of 1550 nm, wherein X is an integer greater than 1 and less than or equal to 20, the first fiber having a positive differential mode group delay between the LP01 and LP11 modes at a wavelength between 1530-1570. The link also has a second optical fiber having a core which supports the propagation and transmission of an optical signal with Y LP modes at a wavelength of 1550 nm, wherein Y is an integer greater than 1 and less than or equal to 20, said optical fiber having a negative differential mode group delay between the LP01 and LP11 modes at a wavelength between 1530-1570. | 08-22-2013 |
20130230279 | LIGHT DELIVERY WAVEGUIDE - A light source and a waveguide are mounted on a recording head slider. Light rays are emitted from the light source into the waveguide. The waveguide may include two core layers for light ray transmission. The first core layer enhances light coupling efficiency from the light source to the second core layer. The second core layer transforms a profile of the light. The waveguide may include a tapered portion with a narrow opening near the light source and a wider opening near the tapered portion exit. The light rays passing through the waveguide may be directed toward a collimating mirror. The collimating mirror makes the light rays parallel or nearly parallel and re-directs the light rays to a focusing mirror. The focusing mirror focuses the collimated light rays to a spot on a magnetic media disc. | 09-05-2013 |
20130315532 | OPTICAL TIME DOMAIN REFLECTOMETRY FOR MULTIPLE SPATIAL MODE FIBERS - An apparatus includes an N×1 spatial mode multiplexer, an optical source and an optical receiver. The spatial mode multiplexer has N input ports and an output port end-couplable to a multimode optical fiber. The multiplexer is configured to preferentially couple light between individual ones of the input ports and corresponding spatial optical modes of the multimode optical fiber. The optical source is connected to a first one of the input ports to launch an optical probe pulse into the fiber. The optical receiver is connected to electrically analyze an optical signal backscattered from the multimode optical fiber and output by a second one of the input ports in response to the launch of the optical probe pulse into the fiber. | 11-28-2013 |
20130330036 | EXCITING A SELECTED MODE IN AN OPTICAL WAVEGUIDE - A method of exciting a selected light propagation mode in a device is disclosed. At least two light beams are propagated proximate a waveguide of the device substantially parallel to a selected surface of the waveguide. Light is transferred from the at least two beams of light into the waveguide through the selected surface to excite the selected light propagation mode in the waveguide. | 12-12-2013 |
20130330037 | EXCITING A SELECTED MODE IN AN OPTICAL WAVEGUIDE - A method of exciting a selected light propagation mode in a device is disclosed. At least two light beams are propagated proximate a waveguide of the device substantially parallel to a selected surface of the waveguide. Light is transferred from the at least two beams of light into the waveguide through the selected surface to excite the selected light propagation mode in the waveguide. | 12-12-2013 |
20140010497 | Generating Broadband Spectral Power In Multimode Optical Fibers - A broadband spectral power generator in a multimode optical fiber utilizes a standard multimode fiber that is coiled. A plate is placed on the coiled fiber and a force is applied to compresses the coiled fiber and thereby increase the interactions between the compressed windings and induce modal mixing and birefringence in the fiber. In addition, the compression causes additional non-linear processes to be excited and occur in the compressed fiber coil to generate more broadband light. This allows for better “mixing” of the spatial beam in the multimode fiber coil and allows for the various modes to overlap. The multimode fiber coil is made of silica, silicate, germinate, phosphate, fluoride, chalcogenide, or telluride. The compressed coiled fiber may be driven by a laser providing more than one wavelength output and this greatly increases the amount of nonlinear mixing in the fiber for a greatly enhanced spectral coverage. | 01-09-2014 |
20140037244 | OPTICAL TRANSMISSION MEDIA TO INDEPENDENTLY SUPPORT SINGLE-MODE AND MULTIMODE SIGNALS - A computing system includes an optical transmission media to propagate a single-mode signal and a multimode signal, and support mode matching with the single-mode signal and multimode signal. A lowest-order mode of the optical transmission media is to couple the single-mode signal, and at least one higher-order mode of the optical transmission media is to couple the multimode signal. The optical transmission media is to enable extraction of the single-mode signal from the optical transmission media independently of the multimode signal. | 02-06-2014 |
20140140659 | ADIABATIC PLANAR WAVEGUIDE COUPLER TRANSFORMER - Methods of depositing materials to provide for efficient coupling of light from a first device to a second device are disclosed. In general, these methods include mounting one or more wafers on a rotating table that is continuously rotated under one or more source targets. A process gas can be provided and one or more of the source targets powered while the wafers are biased to deposit optical dielectric films on the one or more wafers. In some embodiments, a shadow mask can be laterally translated across the one or more wafers during deposition. In some embodiments, deposited films can have lateral and/or horizontal variation in index of refraction and/or lateral variation in thickness. | 05-22-2014 |
20140161390 | INTRA-LINK SPATIAL-MODE MIXING IN AN UNDER-ADDRESSED OPTICAL MIMO SYSTEM - The outage probability in an under-addressed optical MIMO system may be reduced by configuring an intra-link optical mode mixer to dynamically change the spatial-mode mixing characteristics of the link on a time scale that is faster than the channel coherence time. Provided that the MIMO system employs an FEC code that has a sufficient error-correcting capacity for correcting the amount of errors corresponding to an average state of the MIMO channel, this relatively fast dynamic change tends to reduce the frequency of events during which the number of errors per FEC-encoded block of data exceeds the error-correcting capacity of the FEC code. | 06-12-2014 |
20140185982 | WAVE VECTOR MATCHED RESONATOR AND BUS WAVEGUIDE SYSTEM - An optical device including: a waveguide of refractive index n | 07-03-2014 |
20140205234 | VERTICAL OPTICAL COUPLER FOR PLANAR PHOTONIC CIRCUITS - Described herein are an apparatus, system, and method for providing a vertical optical coupler (VOC) for planar photonics circuits such as photonics circuits fabricated on silicon-on-insulator (SOI) wafers. In one embodiment, the VOC comprises a waveguide made from a material having refractive index in a range of 1.45 to 3.45, the waveguide comprising: a first end configured to reflect light nearly vertical by total internal reflection between the waveguide and another medium, a second end to receive the light for reflection, and a third end to output the reflected light. The VOC couples with a Si waveguide having a first region including: a first end to receive light; and an inverted tapered end in the direction of light propagation to output the received light, wherein the inverted tapered end of the Si waveguide is positioned inside the waveguide. | 07-24-2014 |
20140241663 | Ultra-High Power Multimode Combiner - An ultra-high power fiber laser system includes a multimode combiner which is configured with a plurality of low mode fibers bundled together and tapering toward its downstream end. The system further includes a clad mode absorber extending along the tapered downstream end of the combiner and extending over a portion of the combiner's output fiber. The absorber is configured with sequentially located zones which are provided with respective refractive indices. In a forward propagating direction of light signal, the upstream zone includes polymeric material with the refractive index higher than that of the cladding of the combiner end fiber. This zone is configured to remove the back reflected core guided light bled into the cladding of the combiner through a splice between combiner end and output fibers. The intermediate zone includes polymeric material configured with a refractive index lower than that of the cladding of the combiner output fiber so it can prevent clad guided signal light from decoupling the cladding under the material. The downstream zone is configured with polymeric material having a refractive index lower than that of the cladding of the combiner output fiber. The polymeric material of the downstream zone is impregnated with a plurality of light diffusers scattering high numerical aperture rays of the clad-guided signal light. | 08-28-2014 |
20140314372 | SUPPRESSION OF STIMULATED BRILLOUIN SCATTERING IN HIGHER-ORDER- MODE OPTICAL FIBER AMPLIFIERS - An HOM-based optical fiber amplifier is selectively doped within its core region to minimize the presence of dopants in those portions of the core where the unwanted lower-order modes (particularly, the fundamental mode) of the signal reside. The reduction (elimination) of the gain medium from these portions of the core minimizes (perhaps to the point of elimination) limits the amount of amplification impressed upon the backward-propagating Stokes wave. This minimization of amplification will, in turn, lead to a reduction in the growth of the Stokes power that is generated by the Brillouin gain, which results in increasing the amount of power present in the desired, forward-propagating HOM amplified optical signal output. | 10-23-2014 |
20150055914 | ACTIVE OPTICAL CONNECTOR AND SYSTEMS COMPRISING - Simple yet robust active optical connectors are provided comprising: (a) a first connecting module configured to be joined to a first fiber optic cable, the first connecting module being configured to receive a first transmission signal from a signal carrying fiber of the first fiber optic cable and to actively convert the first transmission signal into an optical connection signal; and (b) a second connecting module configured to be joined to a second fiber optic cable, the second connecting module being configured to receive the optical connection signal and to propagate a second transmission signal within a signal carrying fiber of the second fiber optic cable; wherein the first connecting module comprises at least one optical amplifier, and wherein the first and second connecting modules are configured to couple such that the optical connection signal is transmitted and received across a light transmissive interface. | 02-26-2015 |
20150063748 | Dual Band Color Filter - A dual hand color filter includes a periodic arrangement of metallic dots in a middle transparent medium, having index of refraction, interposed between a first and a second transparent medium, each having an index of refraction greater than the middle transparent medium index of refraction. The filter accepts visible spectrum light. In response to the periodic arrangement of metallic dots, a surface plasmon mode is generated. In response to a diameter common to all the metallic dots, a local mode is generated, and in response to the combination of the middle, first, and second transparent medium indices of refraction, a waveguide mode is generated. As a result, two distinct wavelength hands of visible spectrum light are transmitted through the bottom surface of the dual band color filter, while attenuating one wavelength band of visible spectrum light. | 03-05-2015 |
20150086157 | Photonic Lantern Spatial Multiplexers with mode selectivity - A photonic lantern spatial multiplexer that provides mode selectivity includes a multimode optical waveguide and a plurality of single mode optical waveguides. The single mode cores of the single mode optical waveguides merge with the multimode core of the multimode optical waveguide. At least two of the single mode cores have different respective single mode effective refractive indexes. | 03-26-2015 |
20150086158 | Multi-Mode Phase-Shifting Interference Device - A multi-mode interference (MMI) device includes a substrate layer, a core layer deposited on the substrate layer for propagating an optical signal, and a cladding layer deposited on the core layer for guiding the optical signal. The core layer includes a core section suitable for propagating multiple optical signals having different wavelengths. The core section includes a shifting segment for uniquely shifting phases of the multiple optical signals. The shifting segment includes at least one or a combination of sections having different effective refractive index, a tilted segment, a curved section, and waveguides with variations in width, thickness or effective refractive index. | 03-26-2015 |
20150086159 | FIBER OPTIC MODE SCRAMBLER AND A METHOD OF MANUFACTURING THEREOF - A fiber optic mode scrambler includes a multi-mode optical fiber formed with a core and a cladding around the core and a non-adiabatic cross-sectional shape change zone in the optical fiber. The fiber further has a bending region extending over a length of the optical fiber. The optical fiber has a non-zero curvature at the bending region and a device for maintaining the curvature of the optical fiber at the bending region. Mode scramblers can be provided that are accurately adjusted to match with different desired optical characteristics. A well-controlled manufacturing method for the mode scrambler is also described. | 03-26-2015 |
20150104130 | OPTICAL POWER SPLITTER - Embodiments of the present disclosure include devices that split a light beam into two separate paths, with reduced sensitivity to fabrication variation. The devices can operate as 3-dB splitters that divide the input optical energy equally between two output waveguides. Similarly, the devices can also function to combine two light beams into a single path (coupler). The designs make use of adiabatic modal evolution and do not require physical symmetry along the entire device length. | 04-16-2015 |
20150293299 | Suspended Ridge Oxide Waveguide - A waveguide comprising a single-mode optical core configured to carry an optical signal between an inversely tapered waveguide and an optical fiber, wherein the core extends longitudinally along an axis of optical signal propagation between the inversely tapered waveguide and the optical fiber, and an air cladding disposed adjacent to the core along the axis of optical signal propagation. | 10-15-2015 |
20150331189 | MODE SIZE CONVERTERS AND METHODS OF FABRICATING THE SAME - One aspect of the invention provides a method of fabricating a mode size converter. The method includes: exposing a photoresist-coated substrate to varying doses of light exposure to produce a profile in the photoresist of a beam mode size converter; and etching the photoresist-coated substrate to remove an equal thickness of the photoresist and substrate. The beam mode sized converter includes: a first surface having a first surface height and a first surface width; a second surface opposite the first surface, the second surface having a second surface height different than the first surface height and a second surface width different than the first surface width; and one or more boundary surfaces connecting the first surface and second surfaces. | 11-19-2015 |
20150346430 | WAVEGUIDE MODE EXPANDER HAVING AN AMORPHOUS-SILICON SHOULDER - A waveguide mode expander couples a smaller optical mode in a semiconductor waveguide to a larger optical mode in an optical fiber. The waveguide mode expander comprises a shoulder and a ridge. In some embodiments, the ridge of the waveguide mode expander has a plurality of stages, the plurality of stages having different widths at a given cross section. | 12-03-2015 |
20160041338 | OPTICAL END COUPLING TYPE SILICON OPTICAL INTEGRATED CIRCUIT - An optical end coupling type silicon optical integrated circuit is provided using an SOI substrate. This optical integrated circuit is constituted so as to connect with an external optical circuit at an end coupling part and have signal light incident to an optical circuit that includes a curved part. In the plane of the optical integrated circuit, the position of one end coupling part selected from among any thereof and the position of any multimode optical waveguide element to which a respective optical waveguide is connected via a respective curved part satisfy a positional relationship defined on the basis of a beam divergence angle [theta] of stray light. | 02-11-2016 |
20160124148 | OPTICAL WAVEGUIDE, SPOT SIZE CONVERTER AND OPTICAL APPARATUS - An optical waveguide includes a waveguide core including a first region, a second region having a step at which a thickness varies, and a third region having a thickness smaller than that of the first region. The second region has thick film regions continuing with the first region and positioned at both sides in a widthwise direction. The thick film regions have a thickness that is equal to that of the first region and have a gradually reducing width from the first region side to the third region side. The second region further has a thin film region sandwiched by the thick film regions and continuing with the third region. The thin film region has a thickness equal to that of the third region. | 05-05-2016 |
20160124149 | CONDITIONED LAUNCH OF A SINGLE MODE LIGHT SOURCE INTO A MULTIMODE OPTICAL FIBER - An optical coupling system and method are provided for coupling light from a single mode laser (SML) light source into an MMF that reduce back reflection of laser light into the SML light source and provide controlled launch conditions that allow the light to avoid defective areas in the MMF as the light travels in the MMF. The launch conditions are controlled to cause preselected spatial intensity distribution patterns to be launched into the MMF that result in the laser light avoiding defective areas in the MMF as the laser light passes through the MMF. The combination of all of these features allows greater link bandwidth and link length to be achieved with an MMF without increasing transceiver packaging complexity. In addition, because the preselected spatial intensity distributions allow the light to avoid particular areas in the fiber that are likely to contain defects, fiber manufacturers can focus less on reducing defects in those areas and focus more on optimization of performance parameters. | 05-05-2016 |
20160131846 | MODE SIZE CONVERTERS FOR REDUCING A MODAL PROFILE OF INCOMING LIGHT - Mode size converter including an overlay waveguide having an input end configured to receive light from an optical element. The overlay waveguide has a first refractive index. The mode size converter also includes a signal waveguide that is embedded within the overlay waveguide and has a second refractive index that is greater than the first refractive index. The signal waveguide includes first and second arm segments and a stem segment that form a Y-junction. The first and second arm segments are configured to reduce a modal profile of the light propagating toward the stem segment from the input end of the overlay waveguide. Each of the first and second arm segments has a distal end and a pair of opposite side edges, wherein the pair of side edges extend parallel to each other between the corresponding distal end and the stem segment. | 05-12-2016 |
20160170142 | INTEGRATED PHOTONICS MODE EXPANDER | 06-16-2016 |
20160170147 | Optical Coupler Provided With a Structuration | 06-16-2016 |
20160178851 | FIBER OPTIC CABLE CONNECTOR ASSEMBLY INCLUDING INTEGRATED ENHANCED FUNCTIONALITY | 06-23-2016 |
20160377809 | Optical Edge Coupling With A Separate Trimmed Taper - A method includes forming a first optical structure with an inverse taper and a separate optical structure on a semiconductor chip. The illustrative method also includes applying a protective structure over the optical structures and patterning the protective structure to expose the separate optical structure. The method further includes removing a portion of the separate optical structure to form a separate trimmed taper separate from, but adjacent to, the first optical structure. The protective structure is then removed from the first optical structure. Apparatuses are also disclosed. | 12-29-2016 |
20160377821 | OPTICAL CONNECTION OF OPTICAL FIBERS TO GRATING COUPLERS - To couple light between an optical fiber and a grating coupler of a photonic integrated circuits, a mirror is provided to turn light to/from the optical fiber to allow the axis of the optical fiber to be oriented at small angles or parallel to the surface of the PIC, and lowered close to the surface of the PIC. The mirror is further configured to reshape light from a flat polished optical fiber to produce a mode field resembling the mode field of an angled polished optical fiber, to match the design angle of existing grating couplers that are designed to work with angled polished optical fibers. The mirror and optical fiber alignment structure in the optical connector are integrally/simultaneous formed by precision stamping. | 12-29-2016 |
20180024299 | Multi-port optical probe for photonic IC characterization and packaging | 01-25-2018 |