Entries |
Document | Title | Date |
20080260319 | OPTICAL FIBER DELIVERY SYSTEM FOR DELIVERING ULTRASHORT OPTICAL PULSES AND OPTICAL SYSTEM INCLUDING THE SAME - An optical fiber delivery system for delivering ultrashort optical pulses that can efficiently transmit high peak power, ultrashort optical pulses from an optical pulse source to a desired position in an optical apparatus is provided. An optical system including such an optical fiber delivery system is also provided. The optical fiber delivery system includes light waveguide means | 10-23-2008 |
20090003753 | METHOD FOR GENERATING A LINEAR SINGLE POLARIZATION OUTPUT BEAM - A method for generating a linear single-polarization output beam comprises providing an optically active linearly birefringent and linearly dichroic fiber for propagating light and having a single polarization wavelength range and a gain bandwidth; optically pumping the optically active linearly birefringent and linearly dichroic fiber for obtaining fluorescence within the gain bandwidth; and aligning the single-polarization wavelength range to overlap a desired spectral region of the gain profile. | 01-01-2009 |
20090003754 | SILICON STRUCTURE AND METHOD OF MANUFACTURING THE SAME - A silicon structure includes a silicon substrate; and an on-substrate structure including a silicon compound film and formed on said silicon substrate. At least one removal section removed through anisotropic etching and at least one supporting column left through the anisotropic etching to support said on-substrate structure are provided for a direct lower portion of said silicon substrate directly beneath said on-substrate structure. | 01-01-2009 |
20090022443 | Thermo-Optic Devices Providing Thermal Recirculation - Thermo-optical devices providing heater recirculation in an integrated optical device are described. The thermo-optical devices include at least one waveguide having a non-linear path length in thermal communication with a thermal device. Methods of fabrication and use are also disclosed. | 01-22-2009 |
20090022444 | THERMO-OPTIC DEVICES PROVIDING THERMAL RECIRCULATION - Thermo-optical devices providing heater recirculation in an integrated optical device are described. The thermo-optical devices include at least one waveguide having a non-linear path length in thermal communication with a thermal device. Methods of fabrication and use are also disclosed. | 01-22-2009 |
20090123107 | TUNABLE OPTICAL GROUP DELAY BASED ON MICRORESONATOR STRUCTURES - This invention provides a tunable delay of an optical signal having multiple frequency components. The delay comprises at least a first and a second integrated resonators coupled sequentially to a waveguide; the resonators have angular resonant frequencies ω | 05-14-2009 |
20090169147 | APPARATUS, METHOD, AND COMPUTER PROGRAM PRODUCT FOR INTEGRATED INFLUENCER ELEMENT - An apparatus and method for an influencer structure. The apparatus includes a conductive element disposed in one or more radiation-propagating dielectric structures of a waveguide having a guiding region and one or more bounding regions, the conductive element responsive to an influencer signal to influence an amplitude-controlling property of the waveguide; and a coupling system for communicating the influencer signal to the conductive element. A method of operating an influencer includes: a) communicating an influencer signal to a conductive element disposed in one or more radiation-propagating dielectric structures of a waveguide having a guiding region and one or more bounding regions; and b) influencing, responsive to the influencer signal, an amplitude-controlling property of the waveguide. | 07-02-2009 |
20090202189 | Optical control element - There is provided an optical control element in which non-guided light is prevented from entering into an optical waveguide and which is excellent in optical properties, such as optical modulation properties. | 08-13-2009 |
20090232438 | LOW-SPECKLE LIGHT SOURCE DEVICE - A laser light source device which can inexpensively achieve a visually recognizable level of speckle reduction is disclosed. The laser light source device includes: a laser module including a light source and a first optical waveguide, wherein light emitted from the light source is outputted from an output end of the first optical waveguide; a second optical waveguide connected to the first optical waveguide, wherein the light outputted from the output end of the first optical waveguide is inputted to an input end of the second optical waveguide and guided through the second optical waveguide; and an intensity modulation unit disposed in the vicinity of the second optical waveguide, the intensity modulation unit applying intensity modulation to the second optical waveguide, wherein a core diameter at the input end of the second optical waveguide is larger than a core diameter at the output end of the first optical waveguide. | 09-17-2009 |
20090290827 | NONLINEAR OPTICAL LOOP MIRRORS - There are disclosed a nonlinear optical loop mirror. The nonlinear optical loop mirror comprises: an optical coupler which includes a first optical path and a second optical path coupled to each other; and a loop optical path configured to connect the first and second optical paths, wherein the loop optical path is provided with a nonlinear element configured to vary a wavelength of an optical signal and a linear element configured to produce a wavelength dependent time delay for an optical signal. The nonlinear optical loop mirror may function as a delay interferometer for demodulating a differential phase-shift-keying (DPSK) signal. | 11-26-2009 |
20100008616 | CHIRAL FIBER POLARIZER - An chiral optical fiber polarizer is provided that is capable of being fabricated in-line along a conventional polarization maintaining fiber, preferably one which includes at least one structure element that is external, and parallel, to the fiber's core. The novel chiral fiber polarizer is preferably positioned between two unmodified optical fiber portions, and includes a modified central portion with altered fiber cladding interface elements on each side thereof. The modified central portion is of a non-circular cross section, and comprises at least one diameter reduced sub-section operable to allow a light signal of said predefined operation wavelength to propagate substantially in the core and in the at least one external structure element, at least one diameter expanded sub-section operable to allow a light signal to propagate substantially in the core, each sub-section being produced in accordance with a corresponding predefined diameter reduction and expansion profile, where the modified central portion is further configured in accordance with at least one helical pitch profile that is operable to, upon receiving a light signal with a first and second linear polarization components: convert the first linear polarization component to a first elliptical polarization component while scattering the first elliptical polarization component, and convert the second linear polarization component to a second elliptical polarization component, transmit therethrough, and convert back to the second linear polarization component prior to exit therefrom. The inventive polarizer also substantially eliminates the possibility of an undesirable SBS effect. | 01-14-2010 |
20100014799 | Optical structures including nanocrystals - An optical structure can include a nanocrystal on a surface of an optical waveguide in a manner to couple the nanocrystal to the optical field of light propagating through the optical waveguide to generate an emission from the nanocrystal. | 01-21-2010 |
20100021103 | WAVELENGTH BLOCKER - An object of the present invention is to provide a wavelength blocker having the function of adjusting or cutting off the light intensity of a wavelength division multiplexed (WDM) optical signal of a given wavelength. The wavelength blocker provided by the present invention has the following features. Specifically, the wavelength blocker has a structure configured to cut off light of any diffraction order other than required diffraction order, contained in an optical signal diffracted by an arrayed waveguide grating that demultiplexes a wavelength, and thus, the wavelength blocker has crosstalk characteristics or an extinction ratio superior to those of a conventional wavelength blocker and thus has optimum packaging design. Further, the wavelength blocker can become smaller in size than the conventional wavelength blocker, and enables achieving polarization independence and cost reduction. | 01-28-2010 |
20100054653 | SALICIDE STRUCTURES FOR HEAT-INFLUENCED SEMICONDUCTOR APPLICATIONS - A salicide heater structure for use in thermo-optic and other heat-influenced semiconductor devices is disclosed. In one example embodiment, a system is provided that includes a silicon substrate, and a salicide heating element formed on the substrate, for delivering heat radiation to a heat-influenced semiconductor device. Another example embodiment is a salicide semiconductor system that includes a silicon substrate and a salicide structure formed on the substrate, wherein the salicide structure is for delivering heat radiation to a heat-influenced semiconductor device. | 03-04-2010 |
20100074570 | OPTICAL CIRCUIT - According to an aspect of an embodiment, an optical circuit comprising: at least two pairs of two input waveguides; a slab waveguide with one end coupled to two pairs or more of the two input waveguides; and four output waveguides coupled to another end of the slab waveguide; wherein a distance between two pairs of adjacent two input waveguides among two pairs or more of the two input waveguides is approximately four times as long as a distance between the two input waveguides. | 03-25-2010 |
20100080499 | CHANNELIZED DISPERSION COMPENSATION MODULE - There is disclosed an optical device for dispersion compensation of channels within a predetermined wavelength band, comprising: a waveguiding structure; and a grating structure formed in said waveguiding structure; characterized in that said grating structure has a Bragg frequency profile that is divided into contiguous periods, wherein the Bragg frequencies within each period vary between a lower Bragg frequency and an upper Bragg frequency, said lower and upper Bragg frequencies for each period both corresponding to wavelengths outside of said predetermined wavelength band. | 04-01-2010 |
20100086251 | PRODUCTION OF OPTICAL PULSES AT A DESIRED WAVELENGTH USING SOLITION SELF-FREQUENCY SHIFT IN HIGHER-ORDER-MODE FIBER - The present invention relates to an apparatus for producing optical pulses of a desired wavelength. The apparatus includes an optical pulse source operable to generate input optical pulses at a first wavelength. The apparatus further includes a higher-order-mode (HOM) fiber module operable to receive the input optical pulses at the first wavelength, and thereafter to produce output optical pulses at the desired wavelength by soliton self-frequency shift (SSFS). The present invention also relates to a method of producing optical pulses having a desired wavelength. This method includes generating input optical pulses using an optical pulse source, where the input optical pulses have a first wavelength and a first spatial mode. The input optical pulses are delivered into an HOM fiber module to alter the wavelength of the input optical pulses from the first wavelength to a desired wavelength by soliton self-frequency shift (SSFS) within the HOM fiber module, thereby producing output optical pulses having the desired wavelength. | 04-08-2010 |
20100111461 | THERMO-OPTICAL PHASE SHIFTER - Provided is a thermo-optical phase shifter including a composite body having an optical waveguide formed by a core and a clad and having a ratio Δ of a difference between a core refractivity and a clad refractivity against the core refractivity which is 4% or above and a heater attached to the optical waveguide. The composite body has: a bridge structure portion arranged along a substrate surface and separate from the substrate surface via a void; and a fixed portion which supports the bridge structure portion with respect to the substrate and is continuous to the both ends of the bridge structure portion. The bridge structure has a half-circle-arc shape in the plane along the surface of the substrate. | 05-06-2010 |
20100119189 | OPTICAL DELAY LINE INTERFEROMETER - A demodulator is provided for a multilevel differential phase shift keyed signal, capable of eliminating polarization dependence due to birefringence and polarization coupling-induced light resulting from a waveguide structure, and also, polarization dependence due to dynamic birefringence produced at the time of driving a variable phase adjuster. The demodulator is configured of an optical delay line interferometer of a waveguide interference type. The S/N ratio of a demodulated signal in the demodulator formed by the optical delay line interferometer can be also improved. Further, both the polarization dependence and the temperature dependence of the optical delay line interferometer can be reduced. The disposition of a polarization converter and groves filled with a temperature compensation material makes it possible to provide a circuit configuration suitable for eliminating the polarization dependence and the temperature dependence of the optical delay line interferometer. | 05-13-2010 |
20100209038 | HITLESS TUNING AND SWITCHING OF OPTICAL RESONATOR AMPLITUDE AND PHASE RESPONSES - A hitless tunable filter may include a ring resonator, a Mach-Zehnder coupler, and first and second phase shifters. The Mach-Zehnder coupler may include a switching arm that is coupled to the ring resonator at first and second coupling points. The first phase shifter may be used to introduce a first phase shift to light propagating through the ring resonator, while the second phase shifter may be used to introduce a second phase shift to light propagating through the Mach-Zehnder coupler. The Mach-Zehnder coupler may have a free spectral range substantially equal to a free spectral range of the ring resonator divided by a non-negative integer. | 08-19-2010 |
20100209039 | METHOD AND APPARATUS FOR COMPENSATING POLARIZATION-DEPENDENT FREQUENCY SHIFTS IN OPTICAL WAVEGUIDES - The invention relates to a method and to an apparatus for compensating the polarization-dependent shift of the center frequency in an optical filter comprising an interferometer by way of compensating the birefringence in at least one waveguide of the interferometer, wherein at least one half-wave plate is arranged into the optical path of the interferometer and at least a section of the waveguide ( | 08-19-2010 |
20100247021 | OPTICAL DEVICE WITH LARGE THERMAL IMPEDANCE - Embodiments of an optical device, an array of optical devices, and a technique for fabricating the optical device or the array are described. This optical device is implemented on a substrate (such as silicon), and includes a thermally tunable optical waveguide that has good thermal isolation from its surroundings. In particular, a portion of a semiconductor in the optical device, which includes the optical waveguide, is free standing above a gap between the semiconductor layer and the substrate. By reducing the thermal coupling between the optical waveguide and the external environment, the optical device can be thermally tuned with significantly less power consumption. | 09-30-2010 |
20100247022 | DUAL-LAYER THERMALLY TUNED OPTICAL DEVICE - Embodiments of an optical device, an array of optical devices, and a technique for fabricating the optical device or the array are described. This optical device is implemented using two semiconductor layers (such as silicon), one of which includes a heater and the other includes a thermally tunable optical waveguide. Spatially separating these two functions in the optical device results in more efficient heat transfer between the heater and the optical waveguide, reduced heat transfer to the surroundings, and reduced optical losses in the optical waveguide relative to existing silicon-based optical devices. | 09-30-2010 |
20100260452 | OPTICAL CIRCUIT DEVICE AND METHOD - Techniques are generally disclosed for optical devices that may be used to implement a variety of logic devices or other circuits by optical means. Example optical devices use a photodiode to alter the charge carrier concentration in a waveguide, thereby altering the index of refraction of the waveguide. The photodiode may be driven by an optical signal, which may be coupled to the photodiode through an optical waveguide. The optical signal may be configured to control the phase of coherent light coupled through the waveguide. A variety of logic devices and other circuits may be implemented by allowing the light coupled through the waveguide to constructively or destructively interfere with other coherent light. | 10-14-2010 |
20100266232 | ELECTRO-OPTIC MODULATION - A silicon electro-optic waveguide modulator is formed using a metal-oxide-semiconductor (MOS) configuration. Various embodiments are described using different modes of operation of the MOS diode and gate oxide thicknesses. In one example, a high-speed submicron waveguide active device is formed using silicon-on-insulator. A micro-ring resonator intensity-modulator exhibits switching times on the order of tens of pS with modulation depth of 73% with a bias voltage of 5 volts. | 10-21-2010 |
20100296765 | Method and Device For Suppressing Cross-Coupling Component in Multimode Fibers - A laser system includes a multimode fiber (MMF) receiving a single-mode input beam and a mechanical oscillator coupled to the MMF. The oscillator is operative to modulate a phase of interference wave by periodically extending the fiber total length at such a frequency that a cross-coupling coefficient between fundamental and at least one high-order modes is substantially minimized. | 11-25-2010 |
20110019955 | TUNABLE OPTICAL GROUP DELAY - This invention provides a balanced thermal approach to the tuning of an optical time delay device in order to eliminate any long-term time response of the device performance due to thermal time constants of the device, its mount, packaging or electronic temperature control circuits. The invention provides multiple ways to improve the thermal tuning speed of the balanced thermal approach. Additionally, the invention overcomes an issue of microresonator non-uniformity by operating a large group of microresonators as a ‘super-ring’ by tuning the large group together to provide a controllable group delay with large bandwidth. | 01-27-2011 |
20110103733 | NANOMECHANICAL PHOTONIC DEVICES - The present invention relates to devices which operate on gradient optical forces, in particular, nanoscale mechanical devices which are actuable by gradient optical forces. Such a device comprises a waveguide and a dielectric body, with at least a portion of the waveguide separated from the dielectric body at a distance which permits evanescent coupling of an optical mode within the waveguide to the dielectric body. This results in an optical force which acts on the waveguide and which can be exploited in a variety of devices on a nano scale, including all-optical switches, photonic transistors, tuneable couplers, optical attenuators and tuneable phase shifters. The waveguide can also comprise a gap such that two cantilever bridges are formed. | 05-05-2011 |
20110222812 | Dopant Profile Control For High Speed Silicon-Based Optical Modulators - A high speed silicon-based optical modulator with control of the dopant profiles in the body and gate regions of the device reduces the series resistance of the structure without incurring substantial optical power loss. That is, the use of increased dopant values in areas beyond the active region will allow for the series resistance to be reduced (and thus increase the modulating speed of the device) without incurring too large a penalty in signal loss. The dopant profiles within the gate and body regions are tailored to exhibit an intermediate value between the high dopant concentration in the contact areas and the low dopant concentration in the carrier integration window area. | 09-15-2011 |
20110243490 | WAVEGUIDE COUPLER FOR OPTICAL TRANSVERSE-MODE MULTIPLEXING - An optical coupler for coupling a multimode waveguide and two or more other waveguides. In one embodiment, the optical coupler has an optical phase mask disposed between the multimode waveguide and two or more other waveguides. The optical phase mask imposes on the light passing therethrough a spatial phase pattern that causes selective mode-to-waveguide coupling between the multimode waveguide and the other waveguides. The optical coupler can be used, e.g., in transmitters and receivers of optical transverse-mode-multiplexed signals. | 10-06-2011 |
20110249932 | SILICON INTEGRATED PHOTONIC OPTICAL PARAMETRIC AMPLIFIER OSCILLATOR AND WAVELENGTH CONVERTER - The present invention is directed towards systems and methods for adjusting intensity, wavelength and higher and lower frequency components of an optical signal. Photonic apparatus receives a first and a second optical signal. A waveguide provides an anomalous group velocity dispersion the first optical signal or the second optical signal and adjusts intensity or wavelength of the first optical signal or the second optical signal, in response to the anomalous group velocity dispersion. In some embodiments photonic apparatus receives an optical signal comprising a lower frequency component received an amount of time prior to a higher frequency component of the optical signal. A waveguide provides an anomalous group velocity dispersion for the optical signal and adjusts the amount of time between the higher frequency component and the lower frequency component in response to the anomalous group velocity dispersion. | 10-13-2011 |
20110293215 | LOW LOSS LASER TRANSMISSION THROUGH TELESCOPES WITH MIRROR OBSCURATIONS - The invention provides micro-optical and fiber based solutions to the problem of reflective telescopes with secondary or tertiary obscurations, and further, it ameliorates secondary or tertiary obscurations in compact reflective fiber-coupled telescopes configured as optical transmitters. One solution uses a custom hollow optical fiber and lens system to generate an annular beam that would not be obscured by the telescope secondary obscuration. Another solution uses a fiber coupled micro-axicon lens assembly to achieve the same result. | 12-01-2011 |
20120014636 | WAVEGUIDE-TYPE OPTICAL CIRCUIT - A waveguide-type optical circuit comprises an optical coupler being an optical branch coupler constructed from waveguide cores which are closely arranged each other, and dummy patterns that lay along sides of the waveguide cores in the optical coupler for preventing optical major axes of the waveguide cores from inclining. | 01-19-2012 |
20120020607 | Optical waveguide device - An optical waveguide device having multiple functions or high performance, to improve the productivity of products, and to provide an optical waveguide device capable of suppressing deterioration of an operating characteristic of the optical waveguide device, including a thin plate | 01-26-2012 |
20120020608 | Plasmonic Element With Waveguide Trapping - Various plasmonic elements with waveguide trapping are provided. In one embodiment, a plasmonic element includes a waveguide layer including a first surface through which incident light enters the waveguide layer. The waveguide layer includes a medium and an array of plasmonic structures disposed within the medium. The medium has dielectric properties. The resonant frequency of the plasmonic structures is responsive to the dielectric properties of the medium. The plasmonic element is configured to trap incident light scattered by the plasmonic structures in a waveguide mode. | 01-26-2012 |
20120045160 | DISPERSION MEASUREMENT APPARATUS - A dispersion measurement apparatus includes: a pulse generator to output optical pulses including an optical pulse with a first wavelength and an optical pulse with a second wavelength to an optical transmission path, the second wavelength being different from the first wavelength; a reception pulse analyzer including an optical receiver that receives the optical pulses output by the pulse generator, and an analyzer that performs a wavelet transform on an electrical pulse output through the reception performed by the optical receiver; and a calculator to detect, based on a result of the wavelet transform, a time difference between the optical pulse with the first wavelength and the optical pulse with the second wavelength, and to determine dispersion in the optical transmission path. | 02-23-2012 |
20120045161 | SEMICONDUCTOR OPTICAL MODULATION DEVICE - A temperature control module and a support block are mounted on a metal stem. A dielectric substrate is mounted on a side surface of the support block. A support block is mounted on a cooling surface of the temperature control module. A dielectric substrate is mounted on a side surface of the support block. A semiconductor optical modulation element is mounted on the dielectric substrate. A lead pin and a signal line are connected through a bonding wire. The signal line and a signal conductor are connected through a bonding wire. The signal conductor and the semiconductor optical modulation element are connected through a bonding wire. | 02-23-2012 |
20120087613 | THERMALLY CONTROLLED SEMICONDUCTOR OPTICAL WAVEGUIDE - An apparatus includes a conductive or semiconductive substrate and a dielectric layer located directly thereon. A semiconductor layer is located directly on the dielectric layer. The semiconductor layer includes a ridge waveguide and a heater strip extending parallel to the ridge waveguide. The heater strip is electrically isolated from the ridge waveguide and is doped to carry a current therein about parallel to the ridge waveguide. | 04-12-2012 |
20120093454 | Planar waveguide faraday rotator - A planar core and a cladding disposed on opposite sides of thereof. In the best mode, the rotator includes a very low Numerical Aperture (NA) planar waveguide. The cladding is birefringent and the refractive index and birefringence thereof are optimized to provide equal mode propagation velocities for both TE and TM modes for at least one transverse mode. The refractive index and birefringence of the cladding are optimized to provide equal mode propagation velocities for both TE and TM modes for a wide range of transverse modes. | 04-19-2012 |
20120121216 | Polymer Optical Waveguide Current Sensor - Provided is an integrated optical current sensor for measuring the magnitude of current. The integrated optical current sensor is fabricated by integrating optical elements, such as a thermo-optic phase modulator, a waveguide polarizer and an optical coupler, on a single substrate. As compared to the known current sensors using optical fibers, the integrated optical current sensor is more compact and enables measurement of current with higher reliability. Provided also is a method for producing current sensor chips in a large scale by using a process for fabricating integrated optical elements. | 05-17-2012 |
20120148182 | POLARIZATION MODULATION DEVICE AND LASER SYSTEM FOR WIDEBAND LASER - A polarization modulation device for wideband laser comprises a first polarization maintaining optical fiber, a second polarization maintaining optical fiber, and a non-polarization maintaining optical fiber. The non-polarization maintaining optical fiber includes a first polarization controller coupled with the first polarization maintaining optical fiber, and a second polarization controller coupled with the second polarization maintaining optical fiber. | 06-14-2012 |
20120177318 | WAVEGUIDE ELECTRO-ABSORPTION MODULATOR - During operation of an electro-absorption modulator, an optical signal is conveyed, using an optical waveguide in the electro-absorption modulator, to a semiconductor layer that substantially fills a gap between two portions of the optical waveguide. Then, the optical signal is electro-absorption modulated by selectively applying a voltage to electrodes that produces an electric field, approximately perpendicular to the midline of the optical waveguide, in the semiconductor layer. These electrodes are coupled to the edges of the semiconductor layer at the periphery along the width of the semiconductor layer by intervening layers. Furthermore, the intervening layers include a material that has a lower index of refraction than the semiconductor layer, and a lower optical absorption than the electrodes. | 07-12-2012 |
20120189238 | UNBALANCED MACH-ZEHNDER INTERFEROMETER AND MODULATOR BASED THEREUPON - There are provided an unbalanced Mach-Zehnder interferometer and a modulator based thereupon. The interferometer comprises a loop comprising a plurality of cascaded segments of polarization-maintaining fibers, into which an input signal is split such that two light portions of the split signal propagate concurrently in mutually opposite directions along the loop; and a first optical arrangement between a first and a second segment of the loop for rearranging the axes of propagation of the two light portions such that, on at least a one segment, the two light portions propagate along mutually orthogonal polarization axes of the polarization-maintaining fiber. The light portions are then recombined to mutually interfere. Birefringence of the segment(s) where the light portions propagate on mutually orthogonal polarization axes then provides a differential path length of the interferometer. An unbalanced Mach-Zehnder modulator is obtained by inserting a phase modulator within the loop. | 07-26-2012 |
20120195543 | FIBER-OPTIC MODULATORS - This disclosure is directed to fiber-optic modulators that can be integrated in optical fibers to encode data in optical signals. In one aspect, a fiber-optic modulator includes a weak planar, sub-wavelength grating disposed between an end of a first optical fiber and an end of a second optical fiber. A first electrode is disposed on an edge of the grating and connected to an electronic signal source, and a second electrode is disposed on the edge of the grating opposite the first electrode and connected to the electronic signal source. The grating includes a grating pattern to reflect a channel input to the first optical fiber when a low or no current portion of an electronic signal to be generated by the electronic signal source is applied to the grating and to transmit the channel when a high current portion of the electronic signal is applied to the grating. | 08-02-2012 |
20120237153 | MONOLITHIC PHOTONIC INTEGRATED CIRCUIT - An optical device includes a waveguide slab, first and second input port couplers, and first and second output port couplers located over a planar optical substrate. The waveguide slab has a plane of symmetry. The first and second input port couplers extend from the waveguide slab and have an input coupler pair axis located about midway between the first and second input port couplers. The input coupler pair axis is offset at a nonzero first distance from the plane of symmetry. The first and second output port couplers extend from the waveguide slab and have an output coupler pair axis located about midway between the first and second output port couplers. The output coupler pair axis is offset at a different nonzero second distance from the plane of symmetry. | 09-20-2012 |
20120237154 | OPTICAL HYBRID CIRCUIT AND OPTICAL RECEIVER - An optical hybrid circuit includes: a first optical coupler including a first input channel, a second input channel, a first output channel, and a second output channel; a second optical coupler including a third input channel, a fourth input channel, a third output channel, and a fourth output channel; a third optical coupler including a fifth input channel, a sixth input channel, a fifth output channel, and a sixth output channel; a fourth optical coupler including a seventh input channel, an eighth input channel, a seventh output channel, and an eighth output channel; a fifth optical coupler including a ninth input channel, a tenth input channel, a ninth output channel, and a tenth output channel, the ninth input channel coupled to the first output channel; and a sixth optical coupler including an eleventh input channel, a twelfth input channel, an eleventh output channel, and a twelfth output channel. | 09-20-2012 |
20120251028 | Polarization-Alternating Optical Signal Generation using CSRZ Modulation - A method for optical chirp-free optical polarization modulation includes dividing a data modulated optical signal into a first optical path and a second optical path, using a Mach-Zehnder intensity modulator in the first optical path for imparting a π phase difference between adjacent symbols of the data modulated optical signal in the first optical path, adjusting a delay and amplitude of symbols of the data modulated optical signal in the second path so that the symbols in the first path and the symbols in the second path are synchronized and have substantially equal power levels, and combining the first and second optical paths so that symbols from the first and second optical paths are in orthogonal polarizations. | 10-04-2012 |
20120281942 | PLANAR LIGHTWAVE CIRCUIT AND PRODUCTION METHOD FOR PLANAR LIGHTWAVE CIRCUIT - A planar lightwave circuit according to the present invention includes at least two interferometers each of which includes a plurality of optical waveguides, and dummy patterns that are provided on both sides of each of the optical waveguides of an interferometer, having an optical waveguide density lower than the highest optical waveguide density, of the interferometers. The optical waveguide density of an interferometer A | 11-08-2012 |
20130094796 | APPARATUS AND METHODS FOR PRODUCING AND/OR PROVIDING RECIRCULATING OPTICAL DELAY(S) - Exemplary apparatus and method can be availed for providing at least one electromagnetic radiation. For example, it is possible to provide at least one first electromagnetic radiation having a frequency that changes over time with a first characteristic period. Further, with at least one hardware arrangement, it is possible to receive and modify the first electromagnetic radiation(s) into at least one second electromagnetic radiation having a frequency that changes over time with a second characteristic period. The second characteristic period can be smaller than the first characteristic period. The hardware arrangement(s) can include a resonant cavity having a round-trip propagation time for the first electromagnetic radiation(s) that can be approximately the same as the first characteristic period. | 04-18-2013 |
20130101247 | OPTICAL MODULATOR INCLUDING GRAPHENE - An optical modulator includes a first graphene and a second graphene on an upper surface of a semiconductor layer, a first electrode on the first graphene, and a second electrode on the second graphene. Respective side surfaces of the first graphene and the second graphene are separated from each other. A first ridge portion of the semiconductor layer and a second ridge portion on the second graphene constitute an optical waveguide, and the first and second graphenes are on a center portion of the optical waveguide in a vertical direction to the semiconductor. | 04-25-2013 |
20130216175 | DUAL POLARIZATION QUADRATURE PHASE SHIFT KEYING OPTICAL MODULATOR - A DP QPSK optical modulator includes an input port; an optical branching unit; an optical modulation unit having first through fourth Mach-Zehnder interferometers; a first phase-change unit connected to the third Mach-Zehnder interferometer; a second phase-change unit connected to the fourth Mach-Zehnder interferometer; an optical multiplexer; and a multimode interference coupler including a multimode interference waveguide, first through third input ports, and an output port having a taper-shaped waveguide. The first Mach-Zehnder interferometer is connected to the first input port. One end of the optical multiplexer is connected to the second Mach-Zehnder interferometer and the third Mach-Zehnder interferometer via the first phase change unit. The other end of the optical multiplexer is connected to the second input port. The fourth Mach-Zehnder interferometer is connected to the third input port via the second phase-change unit. | 08-22-2013 |
20130243362 | TUNABLE REFLECTORS BASED ON MULTI-CAVITY INTERFERENCE - A reflective structure includes an input/output port and an optical splitter coupled to the input/output port. The optical splitter has a first branch and a second branch. The reflective structure also includes a first resonant cavity optically coupled to the first branch of the optical splitter. The first resonant cavity comprises a first set of reflectors and a first waveguide region disposed between the first set of reflectors. The reflective structures further includes a second resonant cavity optically coupled to the second branch of the optical splitter. The second resonant cavity comprises a second set of reflectors and a second waveguide region disposed between the second set of reflectors. | 09-19-2013 |
20130251299 | MULTI-PORT OPTICAL CIRCULATOR SYSTEM - An optical circulator includes a first optical isolator including a first port and a second port and a plurality of optical isolators coupled to the second port of the first optical isolator. Each of the plurality of optical isolators comprise a first port and a second port. | 09-26-2013 |
20130294719 | Nonlinear Frequency Conversion in Nanoslab Optical Waveguides - A waveguide device for frequency mixing or conversion through birefringent phase matching, having a horizontal waveguide suspended above a substrate. The waveguide is formed of a zinc blende type III-V semiconductor material with a high nonlinear susceptibility. | 11-07-2013 |
20140133793 | POLARIZATION BEAM SPLITTER - An optical system may include: a polarization beam splitter having: a first end having an input configured to receive multiple optical signals; a second end having a first output and a second output, where the first output may provide first components, having a first polarization of the multiple optical signals, and the second output may provide second components, having a second polarization, of the multiple optical signals; and a first waveguide having a first width and a second waveguide having a second width, where the first waveguide and the second waveguide may each have a length corresponding to a difference between the first width and the second width, where the first waveguide and the second waveguide may be configured to induce a phase shift of the plurality of optical signals based on the first width, the second width, and the length of the first waveguide and the second waveguide. | 05-15-2014 |
20140161384 | Integrated Photonic Devices with Reduced Sensitivity to External Influences - One aspect of the invention relates to a photonic device having a wavelength-dependent transmission or filter characteristic, comprising: a Splitter Polarization Rotator receiving polarized light and providing a first resp. second wave; a first resp. second waveguide arm connected to the SPR for propagating a first resp. second polarization mode (TM, TE) of the first resp. second wave, the second polarization mode being different from the first polarization mode; and a Polarization Rotator and Combiner for combining the propagated first resp. second waves; wherein the dimensions of the first and second arm are selected to cancel the influence of an external effect on the wavelength-dependent characteristic. Another aspect of the invention relates to a method for reducing the sensitivity of said integrated photonic device, comprising splitting a polarized light beam, propagating light waves of different polarity through two waveguide arms of specific dimensions, and recombining them. | 06-12-2014 |
20140286603 | METHOD AND DEVICE FOR CONTROLLING A PHYSICAL PARAMETER OF AN OPTICAL SIGNAL - The invention relates to a method and device for controlling a physical parameter of an optical signal. According to the invention, a portion of the initial optical signal (SE) having passed through an optical waveguide from the input ( | 09-25-2014 |
20140301693 | Optical Modulator Using Waveguides - In accordance with an optical modulator using waveguides of the present invention, the reflection phenomenon of light is used, so that the optical modulator is neither sensitive to the wavelength, mode, polarization, intensity, beam size, etc. of light, nor sensitive to the temperature, the waveguide size, the uniformity of a refractive index, carrier doping concentration, changes in control voltage/current, etc., thus obtaining stable optical modulation characteristics. An optical modulator using waveguides includes a first waveguide ( | 10-09-2014 |
20140328556 | Integrated System for Active Equalization of Chromatic Dispersion - A system for chromatic dispersion compensation is presented. The system includes an optical splitting element, a plurality of optical elements, and a plurality of waveguides. The optical splitting element is configured to generate at least a first beam of radiation and a second beam of radiation. The plurality of optical elements is configured to identify one or more optical paths amongst a plurality of optical paths for the first beam of radiation to travel. One of the plurality of waveguides disposed in one of the plurality of optical paths has group delay and dispersion coefficient properties per unit length that are different from group delay and dispersion coefficient properties per unit length of another one of the plurality of waveguides disposed in another one of the plurality of optical paths. The group delay and dispersion coefficient properties per unit length compensate for a chromatic dispersion associated with the second beam of radiation. | 11-06-2014 |
20140334763 | METHOD AND LIGHT PULSE SOURCE FOR GENERATING SOLITON LIGHT PULSES - A method of generating light pulses including pumping laser pulses with a pump laser source, coupling the laser pulses into a pulse guiding medium having an anomalous group-velocity dispersion and a Kerr nonlinearity, and propagating the laser pulses along the pulse guiding medium, wherein soliton-shaped light pulses are formed from the laser pulses within the pulse guiding medium and, resulting from a photoionization of the pulse guiding medium by the light pulses, the light pulses are subjected to a frequency, wherein the method further includes setting the pump laser source and the pulse guiding medium such that the light pulses are fundamental soliton light pulses propagating in the pulse guiding medium, wherein the group-velocity dispersion of the pulse guiding medium being selected such that a ratio of the dispersion and the Kerr nonlinearity decreases with increasing frequency and the fundamental soliton light pulses are compressed with the frequency shift. | 11-13-2014 |
20140341496 | OPTICAL MODULATOR AND OPTICAL MODULE INCLUDING THE SAME - Provided are an optical modulator modulating optical signals and an optical module including the same. The optical modulator includes a lower clad layer, an optical transmission line extended in a first direction on the lower clad layer, and an upper clad layer on the optical transmission line and the lower clad layer. The optical transmission line may include graphene. | 11-20-2014 |
20150063739 | Actively Tunable Polar-Dielectric Optical Devices - Optical devices that include one or more structures fabricated from polar-dielectric materials that exhibit surface phonon polaritons (SPhPs), where the SPhPs alter the optical properties of the structure. The optical properties lent to these structures by the SPhPs are altered by introducing charge carriers directly into the structures. The carriers can be introduced into these structures, and the carrier concentration thereby controlled, through optical pumping or the application of an appropriate electrical bias. | 03-05-2015 |
20150086148 | HIGH HARMONIC OPTICAL GENERATOR - A high harmonic optical generator comprising a laser arrangement for emitting a beam of polarized radiation at a fundamental frequency and an optical waveguide having a hollow core for a gaseous harmonic generation medium for the generation of high harmonics of the fundamental frequency, the optical waveguide having an optical propagation axis along the hollow core, the laser arrangement is configured to couple the beam of polarized radiation along the propagation axis of the hollow core optical waveguide to provide a beam of optical driving radiation for the high harmonic generation, the optical driving radiation having a plane of polarization that rotates about the propagation axis. | 03-26-2015 |
20150316830 | OPTICAL LOGIC CIRCUIT OPERATING BY CONTROLLING REFLECTION OF LIGHT AND COMPUTING DEVICE USING SAID OPTICAL LOGIC CIRCUIT - The disclosed optical logic circuit operating by controlling the reflection of light comprises: a first waveguide, at least a portion of which is formed into the shape of a straight line; a second waveguide branched at a predetermined angle from the first waveguide; and a first reflector having a refractive index that varies based on a first input signal, the first reflector selecting either the first waveguide or the second waveguide as a pathway of light. The value of the signal of a first output terminal provided through the first waveguide and the value of the signal of a second output terminal provided through the second waveguide can be adjusted using the first input signal. | 11-05-2015 |
20150331184 | TUNABLE REFLECTORS BASED ON MULTI-CAVITY INTERFERENCE - A reflective structure includes an input/output port and an optical splitter coupled to the input/output port. The optical splitter has a first branch and a second branch. The reflective structure also includes a first resonant cavity optically coupled to the first branch of the optical splitter. The first resonant cavity comprises a first set of reflectors and a first waveguide region disposed between the first set of reflectors. The reflective structures further includes a second resonant cavity optically coupled to the second branch of the optical splitter. The second resonant cavity comprises a second set of reflectors and a second waveguide region disposed between the second set of reflectors. | 11-19-2015 |
20150370076 | Photostructured Optical Devices and Methods For Making Same - A photostructurable ceramic is processed using photostructuring process steps for embedding devices within a photostructurable ceramic volume, the devices including chemical, mechanical, electronic, electromagnetic, optical, and acoustic devices, all made in part by creating device material within the ceramic or by disposing a device material through surface ports of the ceramic volume, with the devices being interconnected using internal connections and surface interfaces. | 12-24-2015 |
20150377603 | METHOD FOR REDUCING INTERFERENCE FROM SCATTERED LIGHT/REFLECTED LIGHT OF INTERFERENCE PATH BY GENERATING CARRIER THROUGH PHASE - A method for reducing interference from scattered light/reflected light of an interference path by generating carrier through phase. Phase modulation is applied on the terminal of a fiber path, and a target signal is separated from an interference signal by selecting a specific working point, to obtain a purer target signal, thereby lengthening the measurement distance. The signal demodulation manner used in this method is different from the traditional manner of modulation performed by generating a carrier through the phase, and does not need to use the modulation frequency as the reference signal during demodulation, so this manner is easily implemented. The method is applicable to long-distance pipeline monitoring and wide-range fiber perimeter security, and especially to an application environment in which the modulation end is far away from the signal demodulation end. The method can also be applied in an application in which measurement is implemented by modulating an optical transmission phase in a feedback device. | 12-31-2015 |
20150378183 | NANOPHOTONIC SPATIAL LIGHT MODULATOR - A nanophotonic device includes at least two waveguides located on top of a transparent substrate, which form an intersection point at which a part of a first waveguide simultaneously constitutes a part of a second waveguide. A nanoscale element located on top of the intersection point so that it partially or completely covers the intersection point is switchable between two different states, which differ by a refractive index value. The nanophotonic device is operated by injecting at least two optical pulses into the waveguides. Intensity of the optical pulses is selected so that a superposition of the optical pulses switches the nanoscale element into a desired state. Also disclosed is a nanophotonic matrix array in which parallel waveguides form nanophotonic devices. The nanophotonic matrix array may be used as a spatial light modulator (SLM), as an optical mirror, as an optical absorber, or as a tunable optical grating array. | 12-31-2015 |
20160062038 | PLANAR OPTICAL WAVEGUIDE ELEMENT, DUAL POLARIZATION QUADRATURE PHASE SHIFT KEYING MODULATOR, COHERENT RECEIVER, AND POLARIZATION DIVERSITY - A planar optical waveguide element includes: a substrate; and an optical waveguide comprising a core and a cladding, the core being provided on the substrate so as to include first and second core regions arranged in parallel, the cladding having a smaller refractive index than the core. Also, the core forms a preceding-stage mode conversion portion that converts a mode of input light and a subsequent-stage mode conversion portion that converts a mode of light output from the preceding-stage mode conversion portion, and the first and second core regions are spaced apart from each other at an input end of the subsequent-stage mode conversion portion, and a gap between the first and second core regions is continuously decreased along the light waveguide direction such that the first and second core regions are in contact with each other at an output end of the subsequent-stage mode conversion portion. | 03-03-2016 |
20160062208 | FLAT-TOP TUNABLE FILTER - A tunable PLC optical filter having sequentially connected thermally tunable Mach-Zehnder (MZ) interferometers is described. The cascade of MZ interferometers, each having a free spectral ranges matching ITU frequency grid spacing, are tuned so as to have a common passband centered on the frequency of the signal being selected, while having at least one of the stopbands centered on any other ITU frequency. Any other optical channel that may be present at any other ITU frequency is suppressed as a result. Another MZ interferometer in series with the cascade of interferometers including an asymmetric or variable coupler, is tuned to have low transmission at the center frequency of the selected optical channel. | 03-03-2016 |
20160091666 | OPTOELECTRONIC SWITCH - An optoelectronic switch comprising: N switch modules, where N is an integer; and an optical full-mesh interconnect; each switch module comprising: M client facing input ports, and M output facing ports, M being an integer which is either equal to or not equal to N; a pre-mesh AWG, the pre-mesh AWG having M inputs and N outputs, each of the N outputs connected to a respective input on the optical full-mesh interconnect; a post-mesh AWG, the post-mesh AWG having N inputs and M outputs, each of the N inputs connected to a respective output of the optical full-mesh interconnect and each of the M outputs for communicating a signal to one or more of the M outputs of the switch module; and a first array of Detector Remodulators (DRMs) located before the pre-mesh AWG, each DRM of the first array configured to receive a signal from an input of the switch module and to regenerate and/or change the wavelength of the received signal to produce a DRM output, the DRM output forming an input at a respective port of the pre-mesh AWG. | 03-31-2016 |
20160109736 | SYSTEM AND METHOD FOR BRILLOUIN SCATTERING INDUCED TRANSPARENCY - A system and method includes a laser to create a control laser signal and a laser to create a probe laser signal. A resonator creates an acoustic signal adjacent the control laser signal and the probe laser signal. A resulting coherent interaction between the control laser signal and the probe laser signal creates a Brillouin scattering induced transparency in one direction and maintains opacity in an opposite direction. | 04-21-2016 |
20160116678 | SYSTEMS AND METHODS FOR LASER FREQUENCY STABILIZATION USING AN ARBITRARILY BIREFRINGENT RESONATOR - Systems and methods to stabilize a laser frequency include a birefringent resonator that introduces an arbitrary phase difference between two polarization components of the laser beam, a polarizing beam splitter to separate the two polarization components after the birefringent resonator, and a differential detector to monitor the separated two polarizations, based on which an error signal can be produced to control a servo to adjust the laser frequency or resonator resonance frequency accordingly. The birefringent resonator can comprise a fiber ring, a whispering gallery mode (WGM) resonator, or any other birefringent ring resonator. A servo can be included in the systems and methods to lock the laser frequency to the resonant frequency of the birefringent resonator or to lock the resonator resonant frequency to the laser frequency. One or more polarization controllers can also be employed to adjust the polarization state of the laser beam. | 04-28-2016 |
20160116680 | LIGHT COUPLING STRUCTURE AND OPTICAL DEVICE INCLUDING A GRATING COUPLER - Light-coupling structure including a grating coupler that is configured to optically couple with an optical element. The grating coupler has a diffraction grating that extends parallel to a grating plane. The grating coupler is configured to diffract a light beam into first and second diffracted portions when the light beam is effectively normal to the grating plane. The first and second diffracted portions propagate away from each other. The light-coupling structure also includes first and second intermediate waveguides that are optically coupled to the grating coupler and configured to receive the first and second diffracted portions, respectively. The light-coupling structure also includes a common waveguide that is coupled to the first and second intermediate waveguides at a waveguide junction. The first and second diffracted portions propagate within the first and second intermediate waveguides, respectively, and are combined in-phase at the waveguide junction. | 04-28-2016 |
20160131845 | Fiber-based multi-resonator optical filters - Optical filters comprising one or more optically-coupled Fabry-Perot resonators are disclosed. In some embodiments, the one or more optically coupled Fabry-Perot resonators include a graded index fiber. In some embodiments, the one or more optically coupled Fabry-Perot resonators are coupled end-to-end, whereas in other embodiments the one or more optically coupled Fabry-Perot resonators are side-coupled through evanescence. One or more implementations of an optical filter allow a spectral response of an input light beam to be controlled, through various approaches, e.g., by exposing a component fiber to ultra-violet radiation. | 05-12-2016 |
20160131862 | ELECTRONIC/PHOTONIC CHIP INTEGRATION AND BONDING - An optical waveguide device comprising: one or more photonic chips, the one or more photonic chips including: a first portion of a photonic chip comprising an array of first components, each of the first components having an optical input and an electrical output; and a second portion of a photonic chip comprising an array of second components, each of the second components configured to receive an electrical input; the optical waveguide device further comprising: an integrated circuit; the integrated circuit forming an electrical bridge between the electrical outputs of the first components and respective electrical inputs of the second components; wherein the integrated circuit is directly mounted onto the one or more photonic chips; and/or wherein the integrated circuit is located between the first portion of a photonic chip and the second portion of a photonic chip. | 05-12-2016 |
20160139437 | Nonreciprocal Three-Way Divider Based on a Magneto-Optical Resonator - The present invention is based on a two-dimensional photonic crystal in which defects are inserted in a controlled manner, has the main function of division of the power of an input signal, excited in one of its six waveguides, among other three waveguides (output ones), while keeping isolation of the input port by means of two other waveguides. The operating principle of the device is based on the alignment of a dipole mode excited in the resonant cavity, in such a way that the nodes of this mode are oriented in the direction of two waveguides, so that these waveguides are not excited. Due to this alignment, each of the three output waveguides receive about one third of the power of input signal. The orientation of dipole mode is controlled by the applied DC magnetic field and the physical and geometrical parameters of the resonator. | 05-19-2016 |
20160170238 | Apparatus and Method for Differential Thermal Optical Switch Control | 06-16-2016 |
20160178845 | FREE SPACE FIBRE-TO-FIBRE COUPLING USING OPTICAL FIBRES BELOW CUT-OFF | 06-23-2016 |