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With graded index core or cladding

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385 - Optical waveguides

385123000 - OPTICAL FIBER WAVEGUIDE WITH CLADDING

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DocumentTitleDate
20110002590GRADED INDEX MULTIMODE OPTICAL FIBER - A graded index multimode optical fiber (01-06-2011
20130028564Trench-Assisted Multimode Optical Fiber - A trench-assisted, multimode optical fiber includes a central core having an alpha refractive index profile with respect to an outer cladding. The optical fiber also includes an inner cladding, a depressed trench, and an outer cladding. The optical fiber achieves reduced bending losses and a high bandwidth.01-31-2013
20110194827DMD PERFORMANCE IN BEND OPTIMIZED MULTIMODE FIBER - Optical fiber refractive index profile designs having an alpha core profile and a negative index trench to control bend loss, are modified by truncating the edge of the alpha core profile and adding a ledge to the truncated core. The result is low bend loss and preservation of low differential mode delay and high bandwidth.08-11-2011
20090123121RARE EARTH DOPED AND LARGE EFFECTIVE AREA OPTICAL FIBERS FOR FIBER LASERS AND AMPLIFIERS - Various embodiments described herein include rare earth doped glass compositions that may be used in optical fiber and rods having large core sizes. Such optical fibers and rods may be employed in fiber lasers and amplifiers. The index of refraction of the glass may be substantially uniform and may be close to that of silica in some embodiments. Possible advantages to such features include reduction of formation of additional waveguides within the core, which becomes increasingly a problem with larger core sizes.05-14-2009
20100046899Low Bend Loss Single Mode Optical Fiber - Optical waveguide fiber that is bend resistant and single mode at 1260 nm and at higher wavelengths. The optical fiber includes a core of radius R02-25-2010
20130077926MULTIMODE OPTICAL FIBER AND SYSTEM INCORPORATING SUCH - According to some embodiments, a multimode optical fiber comprises a graded index glass core with refractive index Δ1, a maximum refractive index delta Δ103-28-2013
20130039626MULTIMODE OPTICAL FIBER AND OPTICAL BACKPLANE USING MULTIMODE OPTICAL FIBER - An optical backplane system is provided. The optical backplane system includes at least one transceiver, at least one optical connector, and a plurality of multimode optical fibers coupled to the at least one optical connector. Each multimode optical fiber includes a graded index glass core having a diameter in the range of 24 microns to 40 microns, a graded index having an alpha less than 2.12 and a maximum relative refractive index in the range between 0.6 percent and 1.9 percent. The optical backplane further includes a cladding surrounding and in contact with the core. The cladding includes a depressed-index annular portion. The fiber has an overfilled bandwidth greater than 2.0 GHz-km at 1310 nm.02-14-2013
20090154888Bend Resistant Multimode Optical Fiber - Bend resistant multimode optical fibers are disclosed herein. Multimode optical fibers disclosed herein comprise a core region and a cladding region surrounding and directly adjacent to the core region, the cladding region comprising a depressed-index annular portion comprising a depressed relative refractive index which is spaced from the core at least 0.5 microns and less than 4 microns.06-18-2009
20100040336Multimode Fiber With At Least Dual Cladding - Multimode optical fiber is disclosed herein having a core surrounded by first and second annular cladding regions. The second annular cladding region has a maximum relative refractive index that is at least 0.05% higher than the minimum relative refractive index of the first annular cladding region.02-18-2010
20130084048MULTI-MODE OPTICAL FIBER - The present invention relates to a multi-mode optical fiber having a structure to reduce the numerical aperture at the emission end of the multi-mode optical fiber having a length for which practical use is assumed. The multi-mode optical fiber comprises a core portion, a trench portion, and a cladding portion. The multi-mode optical fiber is designed such that the numerical aperture at the emission end thereof is reduced as the fiber length increases, and moreover such that the numerical aperture of the multi-mode optical fiber having a length for which practical use is assumed satisfies a specific condition. By this means, the numerical aperture at the emission end of the multi-mode optical fiber can be kept small, and coupling efficiency of the multi-mode optical fiber with other optical components is drastically improved.04-04-2013
20100067859Single Mode Optical Fiber - An optical transmission fiber comprises a central core having an index difference Δn03-18-2010
20130051747METHOD OF MAKING MULTIMODE OPTICAL FIBERS - A multimode optical fiber is drawn form an optical fiber preform, and during said drawing step, a series of perturbations are imparted to the fiber along the length of the optical fiber, said perturbations exhibiting a non-constant amplitude or repeat period.02-28-2013
20120219260OPTICAL FIBER AND METHOD FOR MANUFACTURING SILICA GLASS - A method for manufacturing deuterium-treated silica glass includes exposing silica glass to a deuterium-containing atmosphere for a predetermined period of time to diffuse deuterium molecules within the silica glass, maintaining the silica glass at 40° C. or higher, and cooling the silica glass to room temperature. The silica glass is a silica glass-based optical fiber having a core made of silica glass, where the core is positioned at a center of the optical fiber and contains at least germanium, and a clad made of silica glass, where the clad surrounds the core and has a lower refractive index than the core. A surface of the silica glass is covered with a resin coating.08-30-2012
20130071082HIGH BIREFRINGENCE POLARIZATION-MAINTAINING OPTICAL FIBER BASED ON MULTI COMPONENT SILICA GLASS - The polarization maintaining optical fiber, or preform therefore, can be of the panda type with a pedestal based on a multi-component silica glass doped with a thermal-expansion-coefficient-reducing dopant which can counteracts the thermal-expansion-coefficient-increasing side-effect of the refractive index-increasing dopant, such that when the preform is drilled to make the stress member channel in a heterogeneous region having both a pedestal portion and a cladding portion, the thermal expansion coefficients are sufficiently close to manage damage which could otherwise be caused by uneven thermal expansion caused by drilling heat.03-21-2013
20130071080Optimized Ultra Large Area Optical Fibers - Certain embodiments of the invention may include optimized trench-assisted ultra large area (ULA) optical fibers. According to an example embodiment of the invention, a trench-assisted optical fiber, optimized for figure-of-merit (FOM) performance is provided. The optical fiber includes a core region having a longitudinal axis, a shelf region surrounding said core region, a cladding region surrounding said shelf region, said core and shelf and cladding regions configured to support and guide the propagation of signal light in a fundamental transverse mode in said core and shelf regions in the direction of said axis. The optical fiber further includes a core effective area (Aeff) of between 135 μm03-21-2013
20130071079Optimized Ultra Large Area Optical Fibers - Certain embodiments of the invention may include optimized trench-assisted ultra large area (ULA) optical fibers. According to an example embodiment of the invention, a trench-assisted optical fiber, optimized for microbending and figure-of-merit (FOM) performance is provided. The optical fiber includes a core region having a longitudinal axis, a shelf region surrounding said core region, a cladding region surrounding said shelf region, said core and shelf and cladding regions configured to support and guide the propagation of signal light in a fundamental transverse mode in said core and shelf regions in the direction of said axis, the cladding region including an inner trench and an outer trench. The optical fiber further includes a core effective area (Aeff) of between 135 μm03-21-2013
20130071081Optimized Ultra Large Area Optical Fibers - Certain embodiments of the invention may include optimized trench-assisted ultra large area (ULA) optical fibers. According to an example embodiment of the invention, a trench-assisted optical fiber, optimized for figure-of-merit (FOM) performance, is provided. The optical fiber includes a core region having a longitudinal axis, a shelf region surrounding said core region, a cladding region surrounding said shelf region, said core and shelf and cladding regions configured to support and guide the propagation of signal light in a fundamental transverse mode in said core and shelf regions in the direction of said axis.. The optical fiber further includes a core effective area (Aeff) of between 135 μm03-21-2013
20120294576LARGE EFFECTIVE AREA OPTICAL FIBERS - Large effective area optical fibers are disclosed. In one embodiment, an optical fiber includes a glass core and a glass cladding surrounding and in direct contact with the glass core. The glass core may include a radius R11-22-2012
20090092365LOW BENDING LOSS MULTIMODE FIBER TRANSMISSION SYSTEM - A bend-loss tolerant multimode fiber transmission system is provided. The system includes: a transmission fiber having a core and a cladding, and a mode-launching system for selectively exciting only a useful portion of the transmission modes, that portion corresponding to high effective refractive indices relative to a refractive index of the cladding the useful portion corresponding to a substantial number of modes. The mode-launching system may include a lead-in fiber, coupled to the transmission fiber, supporting a number of lead-in modes substantially corresponding to the number of transmission modes in the useful portion. The transmission fiber may have a refractive index profile, within a region of its core that is aligned with the lead-in fiber core, which has a shape that matches a refractive index profile shape in the lead-in fiber core. The transmission fiber core may have a graded refractive index profile that is parabolic or nearly parabolic or truncated.04-09-2009
20130064514Gradient Index Optical Waveguide Coupler - A light source is coupled to an input facet that directs light from the light source to a core layer of a waveguide and a gradient index material layer disposed beside the core layer along a portion of a propagation length of the waveguide. Light is launched from the light source into the input facet. In response, the gradient index material layer directs light to the core layer at least along the portion of the propagation length.03-14-2013
20120114292MULTI-CORE OPTICAL FIBER RIBBONS AND METHODS FOR MAKING THE SAME - Multi-core optical fiber ribbons and methods for making multi-core optical fiber ribbons are described herein. In one embodiment, a multi-core optical fiber ribbon includes at least two core members formed from silica-based glass and oriented in parallel with one another in a single plane. Adjacent core members have a center-to-center spacing ≧15 microns and a cross-talk between adjacent core members is ≦−25 dB. In this embodiment each core member is single-moded with an index of refraction n05-10-2012
20110033161RESIN COMPOSITION FOR PRODUCTION OF CLAD LAYER, RESIN FILM FOR PRODUCTION OF CLAD LAYER UTILIZING THE RESIN COMPOSITION, AND OPTICAL WAVEGUIDE AND OPTICAL MODULE EACH UTILIZING THE RESIN COMPOSITION OR THE RESIN FILM - The present invention provides a resin composition and film for forming a cladding layer of an optical waveguide, which composition contains (A) a (meth)acrylic polymer having a weight average molecular weight more than 100,000, (B) a urethane (meth)acrylate, and (D) a radical polymerization initiator; and an optical waveguide and an optical module produced by use of the composition or film. There can be provided a resin composition for forming a cladding layer and a resin film for forming a cladding layer, which exhibit excellent bending durability and twisting durability, and an optical waveguide and an optical module each produced therefrom.02-10-2011
20100272406Bend Resistant Multimode Optical Fiber - Bend resistant multimode optical fibers are disclosed herein. Multimode optical fibers disclosed herein comprise a core region and a cladding region surrounding and directly adjacent to the core region, the cladding region comprising a depressed-index annular portion comprising a depressed relative refractive index.10-28-2010
20110081123MULTI-CLADDING FIBER - Multi-cladding optical fibers to be used in the context of fiber amplifiers and fiber lasers are described herein. Embodiments of optical fibers include a rare-earth doped core into which the signal field is to be amplified. The doped core is surrounded by multiple claddings that guide the pump field to be absorbed by the reactive core material. The first cladding has a depressed refractive index to improve high-order mode bending losses without incurring significant fundamental mode bending losses.04-07-2011
20110286710Single Mode Optical Fiber - An optical transmission fiber comprises a central core having an index difference Δn11-24-2011
20120183267BANDWIDTH-MAINTAINING MULTIMODE OPTICAL FIBERS - The specification describes multimode optical fibers with specific design parameters, i.e., controlled refractive index design ratios and dimensions, which render the optical fibers largely immune to moderately severe bends. The modal structure in the optical fibers is also largely unaffected by bending, thus leaving the optical fiber bandwidth essentially unimpaired. Bend performance results were established by DMD measurements of fibers wound on mandrels vs. measurements of fibers with no severe bends. Additional embodiments of the present invention describe an improved optical link when the inventive multimode fiber is connected to standard or conventional multimode fibers.07-19-2012
20120183268Single-Mode Optical Fiber Having Reduced Bending Losses - A single-mode optical fiber includes a central core, an intermediate cladding, a depressed trench, and an external optical cladding. The central core has a radius r07-19-2012
20100220966Reliability Multimode Optical Fiber - Bend resistant multimode optical fibers are disclosed herein. Multimode optical fibers disclosed herein comprise a core region having a radius greater than 25 microns and a polymer coating applied to the outside of the fiber, the coating spaced from the core no more than 15 microns. The fiber exhibits an overfilled bandwidth at 850 nm greater than 400 MHz-km.09-02-2010
20100266250DISPERSION SHIFT OPTICAL FIBER - A 1.55 μm band dispersion shifted optical fiber is provided which has a low loss and low dispersion slope. A core region “a” is heavily doped with GeO10-21-2010
20080279517Large effective area fiber - An optical fiber according to an embodiment of the present invention comprises: a glass core extending from a centerline to a radius R11-13-2008
20120294577OPTICAL FIBER - According to one example of the invention an optical fiber comprises: (i) a core comprising Al doped silica but essentially no Er or Yb, and having a first index of refraction n1; (ii) at least one F doped silica based cladding surrounding the core and having a second index of refraction n11-22-2012
20080279516Low bend loss coated optical fiber - An optical fiber includes a core and a cladding, said cladding having a refractive index n11-13-2008
20090129736Plastic optical medium and production method thereof - A first polymerizable composition is poured into a pipe (05-21-2009
20090052851Multimode optical fiber with low differential mode delay - An optical multimode fiber including a graded index core and an extended gradient core which has a negative refractive index difference with respect to the cladding. The fiber improves the bandwidth, reliability and complexity of the telecommunication systems that are based on multimode fibers. The fiber reduces the differential mode delay among modes. The fiber thereby allows achieving large bandwidth even in the case when the highest order modes are excited. This has positive effects to the conditions that need to be fulfilled by the components such as optical sources, connectors, fiber couplers, other optical components, cables, etc. The fiber eliminates negative impact of the cladding that allows for reduction of fiber core size and the difference between the cladding and the core and thereby allows for achieving the larger bandwidth of optical fiber at lower fiber production cost.02-26-2009
20090080844OPTICAL COMMUNICATION SYSTEM - A photonic bandgap fiber includes a core formed by a hole at its center, an outer cladding formed around the core, and an inner cladding formed between the core and the outer cladding, in which a two-dimensional Bragg grating is formed by periodically arranging a medium having a different refractive index. An optical fiber is connected to the photonic bandgap fiber, which has wavelength dispersion equal to or larger than 0 ps/nm/km and smaller than wavelength dispersion of the photonic bandgap fiber and D/S value, which is obtained by dividing the wavelength dispersion by dispersion slope, larger than D/S value of the photonic bandgap fiber.03-26-2009
20110229101Single-Mode Optical Fiber - The present invention embraces a single-mode optical fiber typically having reduced bending losses. The optical fiber includes a central core, an intermediate cladding, a buried trench, and an outer cladding. The optical fiber typically has (i), at a wavelength of 1310 nanometers, a mode field diameter with a nominal value of between about 8.6 microns and 9.5 microns (and a tolerance of ±0.4 micron), (ii) a cable cut-off wavelength of no more than 1260 nanometers, and (iii), for a bending radius of 15 millimeters at a wavelength of 1550 nanometers, bending losses of no more than 0.03 dB/turn.09-22-2011
20120195561Multimode Optical Fiber - A multimode optical fiber includes a central core having a graded-index profile with a delta value of about 1.9 percent or greater. The graded-index core profile has at least two different alpha parameter values along the core radius, namely a first value in an inner zone of the central core and a second value in an outer zone of the central core. The second alpha parameter value is typically less than the first alpha parameter value. The graded-index core profile and its first derivative are typically substantially continuous over the width of the graded-index core.08-02-2012
20120141078OPTICAL FIBER - An optical fiber includes a core portion that confines light therein and guides the light therethrough and a cladding portion that is formed around an outer circumference of the core portion. The cladding portion contains a hole which is formed at a position a distance away from the core portion such that the hole does not substantially affect an effective core area or a chromatic dispersion characteristic of the optical fiber. The hole decreases a microbending loss of the optical fiber.06-07-2012
20090116800Large mode area fiber amplifiers with reduced stimulated brillouin scattering - A large mode area fiber amplifier suitable for high power applications includes a core region specifically configured to allow for high power operation while also limiting the amount of SBS that is generated. The composition of the core region is selected to include a dopant (such as aluminum) in selected areas to reduce the acoustic refractive index of the core and limit the spatial overlap between the acoustic and optical fields. The acoustic refractive index is also structured so that the acoustic field is refracted away from the central core area. In one embodiment, the core may comprise a depressed index center portion and surrounding ring core area, with the center portion including the aluminum doping and the ring formed to have a diameter less that the phonon decay length for the operating wavelength(s).05-07-2009
20110058780SINGLE-MODE FIBER AND PRODUCTION METHOD THEREOF - A single mode fiber having a core, an inner cladding, a depressed cladding, and an outer cladding composed of pure silica glass. The core is surrounded in sequence with the inner cladding and the depressed cladding. The core has silica glass doped with germanium and fluorine, with a diameter (a) of 8.0-8.8 μm, a relative refractive index difference (Δ03-10-2011
20100303428Bend Resistant Multimode Optical Fiber - Bend resistant multimode optical fibers are disclosed herein. Multimode optical fibers disclosed herein comprise a core region and a cladding region surrounding and directly adjacent to the core region, the cladding region comprising a depressed-index annular region, wherein the inner boundary of said depressed index region is an extension of the graded index core, the depressed region having a moat volume greater than 105%-um12-02-2010
20130136404Multicore Optical Fiber with Reduced Inter-Core Crosstalk - Various apparatus and methods for reducing inter-core crosstalk in a multicore optical fiber are disclosed. A multicore optical fiber may include a plurality of cores capable of transmitting optical signals, and a cladding surrounding the cores, the cladding having a heterogeneous refractive index such that the optical signals propagate at different velocities in different ones of the cores. A multicore optical fiber may include a first length including cores having heterogeneous modal velocities and a second length, adjacent to the first length, including cores having heterogeneous modal velocities, and the cores in the first length are aligned with cores in the second length having a different modal velocity. Inter-core cross talk in a multicore optical fiber may also be reduced by transmitting optical signals through cores of a multicore optical fiber and pumping light into the cores to create unequal modal velocities in the cores.05-30-2013
20130136408LOW BEND LOSS OPTICAL FIBER - One embodiment of a single mode optical fiber includes: 05-30-2013
20090016686OPTICAL FIBER GRATINGS FOR HANDLING INCREASED POWER LEVELS AND METHODS OF MAKING - Optical fibers and optical fiber lasers including gratings and methods of writing gratings into fibers. A method can comprise providing a photosensitive optical fiber having a region having an original refractive index (RI) profile along the elongate direction of the fiber; exposing the optical fiber to actinic radiation to alter the original RI profile to form along a length of the fiber a grating having a RI profile including alternating higher RI and lower RI sections; and wherein the maximum RI difference between a RI of a higher RI section and a RI of an adjacent lower RI section of the grating RI profile is no greater than 85% of the difference between the average index of the grating RI profile and the original RI profile.01-15-2009
20110044595Transmission Optical Fiber Having Large Effective Area - The present invention relates to a transmission optical fiber. The optical fiber includes, from its center to its periphery a central core, an intermediate cladding, and a depressed cladding. The optical fiber has an effective area (S02-24-2011
20110044596MULTI-MODE BENDING-RESISTANT FIBER AND PRODUCTION METHOD THEREOF - A multimode fiber including a core and a cladding. The core has a radius (R1) of 24-26 μm, the refractive index profile thereof is a parabola, and the maximum relative refractive index difference (Δ1) is 0.9-1.1%. The cladding surrounds the core and includes from inside to outside an inner cladding, a middle cladding, and an outer cladding; a radius (R2) of the inner cladding is 1.04-1.6 times that of the core, and a relative refractive index difference (Δ2) thereof is −0.01-0.01%; the middle cladding is a graded refractive index cladding whose radius (R3) is 1.06-1.8 times that of the core, and a relative refractive index difference thereof is decreased from Δ2 to Δ4; and a radius (R4) of the outer cladding is 2.38-2.63 times that of the core, and a relative refractive index difference (Δ4) thereof is between −0.20 and −0.40%. The invention reduces the additional bending loss of the fiber, improves the bending resistance and mechanical properties, basically eliminates the internal stress, and ensures the service life even working for a long term under the condition of low radius. The method for producing the fiber is simple, effective, and suitable for mass production.02-24-2011
20110243518NON-ZERO DISPERSION SHIFTED FIBER WITH LOW ATTENUATION AND MANUFACTURING METHOD THEREOF - A non-zero dispersion shifted fiber includes a core region, and a clad region located out of the core region. The core region is classified into a plurality of detailed regions in accordance with refractive index contrasts. Among the detailed regions, a region located at a center of the fiber has GeO10-06-2011
20080205837Optical waveguide sensor and method of manufacture - An optical waveguide environmental sensor is provided that is capable of detecting a target gas or liquid in the ambient environment in an advantageously short period of time. The waveguide is preferably in the form of an optical fiber having a cladding that contains a photonic band gap structure which in turn envelopes a light conducting, hollow core portion. The cladding further includes at least one elongated side opening that preferably extends the entire length of the fiber and exposes said hollow core portion to the ambient environment, which provides broad and nearly immediate access of the core portion to gases and liquids in the ambient environment, thereby minimizing sensor response time. The ambient gases or liquids filling the hollow core portion and elongated opening function as a ridge and slab, respectively, of an optical ridge waveguide that effectively supports at least one bound optical mode.08-28-2008
20110135263High-Bandwidth Multimode Optical Fiber Having Reduced Bending Losses - The present invention embraces a multimode optical fiber that includes a central core having an alpha-index profile, an inner cladding, a depressed trench, and an outer cladding (e.g., an outer optical cladding). Typically, the central core's alpha-index profile has a minimum refractive index at the central core's radius that corresponds to a refractive index difference with respect to the outer cladding. The optical fiber achieves reduced bending losses and a high bandwidth with a reduced cladding effect for high-data-rate applications.06-09-2011
20120148207Waveguides Configured To Simultaneously Guide Electromagnetic Waves Of Different Wavelengths - In one embodiment, an waveguide includes a primary core configured to guide electromagnetic waves having relatively long wavelengths, a unit cell having a core configured to guide electromagnetic waves having relatively short wavelengths, the relatively long wavelengths being at least twice as long as the relatively short wavelengths, and a cladding material that surrounds the primary core and the unit cell.06-14-2012
20110097048Techniques for Manufacturing Birefringent Optical Fiber - In a technique for fabricating a birefringent optical fiber, a preform rod is fabricated having a longitudinal axis, an outer peripheral surface, and a selected refractive index variation. At least one longitudinal groove is cut into the preform rod through its outer peripheral surface, wherein the at least one longitudinal groove has a cross sectional area equal to that of a respective birefringence-inducing stress element to be loaded into the groove, such that when the stress element is loaded into the groove, a portion of the stress element protrudes outside of the circumference of the preform. A respective birefringence-inducing stress element is loaded into the at least one longitudinal groove. A preform assembly is created by positioning the loaded preform rod within an overcladding tube. The preform assembly is drawn into optical fiber.04-28-2011
20100158460LOW BEND LOSS OPTICAL FIBER - Disclosed is a low bend loss optical fiber including: a core; an inner layer disposed at outside of the core, which has a refractive index lower than a refractive index of the core, the refractive index of the inner layer gradually decreasing as it becomes farther from the core; and a trench layer disposed at outside of the inner layer, which has a lowest refractive index.06-24-2010
20100067858Bandwidth-maintaining multimode optical fibers - The specification describes multimode optical fibers with specific design parameters, i.e., controlled refractive index design ratios and dimensions, which render the optical fibers largely immune to moderately severe bends. The modal structure in the optical fibers is also largely unaffected by bending, thus leaving the optical fiber bandwidth essentially unimpaired. Bend performance results were established by DMD measurements of fibers wound on mandrels vs. measurements of fibers with no severe bends.03-18-2010
20120308187Low Loss Aluminum Doped Optical Fiber for UV Applications - An optical system comprising: a light source providing light in 300-700 nm range; and an optical fiber optically coupled to the source; the optical fiber is structured to transmit the light provided by the source and comprises Al doped silica based core with 0 to 1 wt % of Ge and no rare-earth metal(s); and at least one silica based cladding surrounding the core. According to some embodiments the fiber includes: a core having a radius of no more than 2.0 μm and having a first index of refraction n12-06-2012
20110305423Multimode 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. A multimode fiber for Ethernet optical system with an improved bandwidth is thus obtained.12-15-2011
20090003787METHOD FOR MANUFACTURING A PREFORM AS WELL AS A METHOD FOR FORMING OPTICAL FIBRES FROM SUCH A PREFORM - The present invention relates to a method for manufacturing a preform for optical fibres by means of a vapour deposition process, wherein plasma conditions are created, and wherein the plasma is moved back and forth along the longitudinal axis of the hollow substrate tube between a reversal point near the supply side and a reversal point near the discharge side of the hollow substrate tube, wherein a transition deposition is carried out between the deposition of one phase and the deposition of the other phase.01-01-2009
20120008907OPTICAL FIBER - The present invention provides an optical fiber which can have a larger NA and a preferable mechanical strength even with a monolayer coating and can be fabricated at low cost, and which can transmit excitation light efficiently reducing a loss even under a high temperature environment during the operation of a fiber laser. An optical fiber according to an embodiment of the present invention includes a core, a glass cladding which is provided at a periphery of the core and has a refractive index smaller than the core, and a polymer cladding which is provided at a periphery of the glass cladding and has a refractive index smaller than the glass cladding. The polymer cladding contains fluorine and the polymer cladding has a difference between an elasticity modulus at 60° C. and that at 23° C. equal to or smaller than 100 MPa and also has an elasticity modulus equal to or larger than 200 MPa at 23° C.01-12-2012
20120014654OPTICAL FIBER AND METHOD FOR MANUFACTURING SAME - Provided is an optical fiber having a large relative refractive index difference and a reduced transmission loss, as well as a manufacturing method therefor. An optical fiber preform 01-19-2012
20120063734MULTIMODE GRADED-INDEX PLASTIC OPTICAL FIBER AND METHOD FOR PRODUCING THE SAME - A multimode graded-index plastic optical fiber comprises a cladding and a core. The core has a refractive index which continuously becomes higher as closer to a center of a circular cross-section of the core. The core propagates light of a first mode group, which should be propagated, of incoming light from one end face of the core and emits the light from the other end face of the core. The cladding is provided on a periphery of the core and has a cylindrical cross-section. The cladding has a refractive index which is lower than that of the core. The cladding deflects light of the first mode group at an interface with the core. The core has a first core section, a second core section and a third core section. The first core section contacts an inner circumference of the cladding. The second core section is inside the first core section, and is inside the core. The second core section is a light scattering section which scatters light of a second mode group of the incoming light outside. The second mode group is of a higher order than the first mode group.03-15-2012
20120106909LARGE EFFECTIVE AREA OPTICAL FIBER WITH LOW BEND LOSS - An optical fiber includes a central glass core region comprising maximum refractive index delta percent Δ05-03-2012
20110091175SINGLE MODE OPTICAL FIBER WITH IMPROVED BEND PERFORMANCE - Methods and apparatus relate to optical fibers suitable for use in sensing applications exposed to radiation environments. The fibers include a core of pure silica or chlorine doped silica surrounded by a fluorinated silica cladding. These glasses for the core and cladding utilize dopants that resist radiation-induced attenuation. A two step process for forming the cladding can achieve necessary concentrations of the fluorine by performing a soot deposition process in a different environment from a consolidation process where the soot is sintered into a glass. Concentration of fluorine doped into the cladding layer enables obtaining a numerical aperture that confines a mono-mode of the fiber to resist bend-induced attenuation. Dimensions of the fiber further facilitate bending ability of the fiber.04-21-2011
20110103759Anti-guiding waveguides - Acoustically anti-guiding optical structures are provided. In an exemplary acoustically anti-guiding fiber, a suitable cladding size for ant guiding fibers occurs wherein the cladding size is determined such that the net material dampening in the cladding is large enough to dampen acoustic waves. In another embodiment, a cladding can be considered infinite if the round-trip time from a core to an outer cladding boundary (or interface) is greater than a coherence time of an acoustic wave.05-05-2011
20110103758OPTICAL FIBER AND METHOD OF MANUFACTURING THE SAME - An optical fiber comprising: a core formed in a center axis area; an inner clad layer, disposed around the core, having a refractive index smaller than that of the core; a pore layer, disposed around the inner clad layer, having a plurality of elongated pores; and an outer clad layer, disposed around the pore layer, having a refractive index equal to or smaller than the refractive index of the core, wherein a length of the elongated pores is not larger than 200 m.05-05-2011
20110103757SIDE-EMITTING STEP INDEX FIBER - Side-emitting step index fibers. Between core and cladding, the side-emitting step index fibers have scattering centers that ensure the coupling out of light from the fiber. The side-emitting step index fibers are produced by preforms that contain inlay rods, in which the scattering centers are embedded and which are applied to the outer region of the fiber core during fiber drawing. Alternatively, at least one inlay tube can be used.05-05-2011
20120076465LOW LOSS BROADBAND FIBER COUPLER TO OPTICAL WAVEGUIDE - An apparatus that comprises an optical-mode-converter. The optical-mode-converter includes a optical waveguide including a segment directly located on a substrate and a cantilevered segment located over said substrate and separated from said substrate by a cavity, and, said cantilevered segment includes a core surrounded by a cladding. The optical-mode-converter also includes a dielectric material filling said cavity and contacting said cantilevered segment over said cavity, wherein said dielectric material has a refractive index that is less than a refractive index of said cladding and that is no more than about 20 percent less than said refractive index of said cladding.03-29-2012
20100046898Large mode area fiber amplifiers with reduced stimulated brillouin scattering - A large mode area fiber amplifier suitable for high power applications includes a core region specifically configured to allow for high power operation while also limiting the amount of SBS that is generated. The composition of the core region is selected to include a dopant (such as aluminum) in selected areas to reduce the acoustic refractive index of the core and limit the spatial overlap between the acoustic and optical fields. The acoustic refractive index is also structured so that the acoustic field is refracted away from the central core area. In one embodiment, the core may comprise a depressed index center portion and surrounding ring core area, with the center portion including the aluminum doping and the ring formed to have a diameter less that the phonon decay length for the operating wavelength(s).02-25-2010
20120177333OPTICAL FIBER - An optical fiber includes a center core portion; an inner core layer formed around an outer circumference of the center core portion, a refractive index of which is less than that of the center core portion; an outer core layer formed around an outer circumference of the inner core layer, a refractive index of which is less than that of the inner core layer; and a cladding portion formed around an outer circumference of the outer core layer. A refractive index of the cladding portion is substantially equal to that of the inner core layer. At a wavelength of 1550 nm, an effective core area is equal to or larger than 130 μm07-12-2012
20120230638BEND RESISTANT MULTIMODE OPTICAL FIBER - Bend resistant multimode optical fibers are disclosed herein. Multimode optical fibers disclosed herein comprise a core region and a cladding region surrounding and directly adjacent to the core region, the cladding region comprising a first region having index delta percent Δ09-13-2012
20090060436Large effective area high SBS threshold optical fiber - Microstructured optical fiber for transmitting optical signals comprised of light, the optical fiber including a core region and a cladding region surrounding the core region, the cladding region including at least one annular region having an index of refraction lower than that of the remainder of the cladding. The optical fiber provides an absolute SBS threshold in dBm greater than about 9.3+10log[(1−e03-05-2009
20120189258Microbend-Resistant Optical Fiber - Disclosed is an improved, single-mode optical fiber possessing a novel coating system. When combined with a bend-insensitive glass fiber, the novel coating system according to the present invention yields an optical fiber having exceptionally low losses.07-26-2012
20110123162High-Bandwidth, Dual-Trench-Assisted Multimode Optical Fiber - The present invention embraces an optical fiber that includes a central core having an alpha-index profile with respect to an outer cladding, a first depressed trench, an inner cladding, a second depressed trench, and an outer cladding (e.g., an outer optical cladding). The second depressed trench's volume is typically greater than the first depressed trench's volume. The optical fiber achieves reduced bending losses and a high bandwidth with a reduced cladding effect for high-data rate applications.05-26-2011
20110123161High-Bandwidth Multimode Optical Fiber with Reduced Cladding Effect - The present invention embraces an optical fiber that includes a central core having an alpha refractive index profile with respect to an outer cladding. The optical fiber also includes an inner cladding, a depressed trench, and an outer cladding. The optical fiber achieves reduced bending losses and a high bandwidth with a reduced cladding effect for high-data-rate applications.05-26-2011
20110217011HIGH NUMERICAL APERTURE MULTIMODE OPTICAL FIBER - Multimode optical fibers with a large core diameter and high numerical aperture are disclosed herein. Multimode optical fibers disclosed herein comprise a core region having a radius greater than 30 microns and a cladding region surrounding and directly adjacent to the core region, the cladding region comprising a depressed-index annular portion comprising a depressed relative refractive index. The depressed cladding region is surrounded by a titania doped cladding region. The fiber has a total outer diameter of less than 120 microns, and exhibits an overfilled bandwidth at 850 nm greater than 200 MHz-km.09-08-2011
20100232755Single Mode Optical Fiber as well as Optical Communication System - The present invention relates to a single mode optical fiber comprising a first central region having a radius r09-16-2010
20120087626MULTI-CORE OPTICAL FIBRE - A multi-core optical fibre 04-12-2012
20120087625FIBER PREFORM AND METHOD FOR MANUFACTURING THEREOF - A fiber preform, including: a fiber core rod and an outer cladding layer. The ratio of the diameter of the fiber core rod to the diameter of the core layer thereof is 2.1-2.8. The fiber core rod and a small fluorine-doped quartz glass tube are melted to form a core rod assembly. The ratio of the diameter difference between the core rod assembly and the fiber core rod to the diameter of the core layer is 0.5-2.2. The relative refractive index difference of fluorine-doped quartz glass relative to purified quartz glass Δ04-12-2012
20120328255Few-Moded Optical Fibers - Few moded optical fibers with small delay differences between the propagating modes are disclosed. In one embodiment, an optical fiber includes a glass core and a glass cladding surrounding and in direct contact with the glass core. The glass core may include a radius R12-27-2012
20110135262Multimode Optical Fiber with Low Bending Losses and Reduced Cladding Effect - The present invention embraces an optical fiber that includes a central core having an alpha-index profile with respect to an outer cladding. The optical fiber also includes an inner cladding, a depressed trench, and an outer cladding. Typically, the alpha-index profile of the central core is interrupted at a point having a positive refractive index difference with respect to the outer cladding. The optical fiber achieves reduced bending losses and a high bandwidth with a reduced cladding effect for high-data-rate applications.06-09-2011
20120243843Bend-Resistant Multimode Optical Fiber - A multimode optical fiber includes a central core surrounded by an outer cladding. The central core has a graded-index profile with respect to the outer cladding and an outer radius r09-27-2012
20080226244Compound, Polymerizable Composition, Optical Device, and Method for Producing Refractive Index Profile Optical Device - Using a compound of the following formula (1) makes it possible to provide an optical device having a reduced transmission loss.09-18-2008
20130170802OPTICAL WAVEGUIDE AND A METHOD FOR MAKING AN OPTICAL WAVEGUIDE - The invention provides an optical waveguide and a method of making an optical waveguide. The waveguide has a curved section having an asymmetric refractive index profile, in which the refractive index varies asymmetrically across the waveguide cross-section in dependence on the radius of the curved section of the waveguide.07-04-2013
20130170803OPTICAL WAVEGUIDE AND ELECTRONIC DEVICE - An optical waveguide including a first cladding layer; a core layer, including first and second core sections with cladding sections on sides thereof in the in-layer direction; and a second cladding layer. A refractive index distribution in the in-layer direction in the core layer, from the first core section to an adjacent cladding section, has a continuous change and a region with a first peak, a first dip, and a second peak in this order; the first peak at a position of the first core section, the second peak with a maximum value of refractive index smaller than of the first peak, at a position of the cladding section, and a portion, from the first cladding layer to the first core section, corresponded to a refractive index distribution in the layer-stacking direction, discontinuously changing at the boundary between the first cladding layer and first core section.07-04-2013
20110274398MULTICORE FIBERS AND ASSOCIATED STRUCTURES AND TECHNIQUES - A multicore fiber comprises a plurality of cores extending along the length of a fiber body. Each of the cores is surrounded by a cladding. The plurality of cores and surrounding cladding provide respective index variations, so as to form a respective plurality of waveguides for conducting parallel data transmissions from a first end of the fiber to a second end. The plurality of cores has a cross-sectional geometry in which the plurality of cores is configured in a polygonal array, in which at least some of the cores are positioned at the vertices of the array. The polygonal array is configured such that neighboring cores in the array are separated from each other by a distance that is sufficient to prevent crosstalk therebetween.11-10-2011
20120251062Multimode Optical Fiber - A multimode optical fiber includes a central core surrounded by an outer cladding. The central core has a graded-index profile with respect to the outer cladding and an outer radius r10-04-2012
20130136406LOW BEND LOSS OPTICAL FIBER - An optical fiber comprising: (I) a germania doped central core region having outer radius r05-30-2013
20130114935BEND LOSS RESISTANT MULTI-MODE FIBER - A graded index multimode optical fiber comprising: (a) a silica core doped with germania, and at least one co-dopant, comprising one of P05-09-2013
20130094824BEND INSENSITIVE FIBER - Provided is an extreme bending insensitive optical fiber. The optical fiber includes a core comprising a maximum refractive index difference Δn04-18-2013
20130114934GE-P CO-DOPED MULTIMODE OPTICAL FIBER - According to at least one embodiment a graded index multimode fiber comprises: (i) a silica based core co-doped with GeO05-09-2013
20130136405LOW BEND LOSS OPTICAL FIBER - One embodiment of a single mode optical fiber includes: 05-30-2013
20130136407LOW BEND LOSS OPTICAL FIBER - According to some embodiments a single mode fiber includes: 05-30-2013
20130148934OPTICAL FIBER, OPTICAL TRANSMISSION SYSTEM, AND METHOD OF MAKING OPTICAL FIBER - Provided is an inexpensive low-loss optical fiber suitably used in an optical transmission network. An optical fiber includes a core, an optical cladding, and a jacket. The core has a relative refractive index difference between 0.2% and 0.32% and has a refractive index volume between 9%·μm06-13-2013
20130183014OPTICAL WAVEGUIDE STRUCTURE AND ELECTRONIC DEVICE - An optical waveguide structure containing a plurality of core portions for transmitting light (L), in which adjacent core portions are arranged with substantially parallel central axes, and the optical paths of the light (L) that is transmitted through the adjacent core portions are in opposite directions, wherein each core portion has a tapered section in which the area of the cross-section in a direction substantially perpendicular to the central axis decreases gradually in the direction of the optical path of the light (L). A highly reliable electronic device containing the optical waveguide structure is also provided.07-18-2013
20110293232Hydrogen-resistant optical fiber/grating structure suitable for use in downhole sensor applications - A hydrogen-resistant optical fiber particularly well-suitable for downhole applications comprises a relatively thick pure silica core and a depressed-index cladding layer. Interposed between the depressed-index cladding layer and the core is a relatively thin germanium-doped interface. By maintaining a proper relationship between the pure silica core diameter and the thickness of the germanium-doped interface, a majority (preferably, more than 65%) of the propagating signal can be confined within the pure silica core and, therefore, be protected from hydrogen-induced attenuation problems associated with the presence of germanium (as is common in downhole fiber applications). The hydrogen-resistant fiber of the present invention can be formed to include one or more Bragg gratings within the germanium-doped interface, useful for sensing applications.12-01-2011
20130195410OPTICAL FIBER WITH A VARIABLE REFRACTIVE INDEX PROFILE - An optical waveguide, such as an optical fiber, which relies on a mechanism involving scattering in random structures to confine light to a region of the waveguide and allow propagation of electromagnetic radiation along the length of the waveguide includes an optically transmissive body having a length and a cross-section transverse to the length, wherein the optically transmissive body has refractive indices that are cross-sectionally random and substantially invariant along the length direction of the waveguide.08-01-2013

Patent applications in class With graded index core or cladding