Entries |
Document | Title | Date |
20080205837 | Optical 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 |
20080226244 | Compound, 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 |
20080279516 | Low bend loss coated optical fiber - An optical fiber includes a core and a cladding, said cladding having a refractive index n | 11-13-2008 |
20080279517 | Large 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 R | 11-13-2008 |
20090003787 | METHOD 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 |
20090016686 | OPTICAL 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 |
20090052851 | Multimode 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 |
20090060436 | Large 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−e | 03-05-2009 |
20090080844 | OPTICAL 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 |
20090092365 | LOW 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 |
20090116800 | Large 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 |
20090123121 | RARE 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 |
20090129736 | Plastic optical medium and production method thereof - A first polymerizable composition is poured into a pipe ( | 05-21-2009 |
20090154888 | Bend 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 |
20100040336 | Multimode 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 |
20100046898 | Large 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 |
20100046899 | Low 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 R | 02-25-2010 |
20100067858 | Bandwidth-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 |
20100067859 | Single Mode Optical Fiber - An optical transmission fiber comprises a central core having an index difference Δn | 03-18-2010 |
20100158460 | LOW 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 |
20100220966 | Reliability 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 |
20100232755 | Single 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 r | 09-16-2010 |
20100266250 | DISPERSION 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 GeO | 10-21-2010 |
20100272406 | Bend 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 |
20100303428 | Bend 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%-um | 12-02-2010 |
20110002590 | GRADED INDEX MULTIMODE OPTICAL FIBER - A graded index multimode optical fiber ( | 01-06-2011 |
20110033161 | RESIN 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 |
20110044595 | Transmission 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 (S | 02-24-2011 |
20110044596 | MULTI-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 |
20110058780 | SINGLE-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 (Δ | 03-10-2011 |
20110081123 | MULTI-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 |
20110091175 | SINGLE 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 |
20110097048 | Techniques 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 |
20110103757 | SIDE-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 |
20110103758 | OPTICAL 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 |
20110103759 | Anti-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 |
20110123161 | High-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 |
20110123162 | High-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 |
20110135262 | Multimode 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 |
20110135263 | High-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 |
20110194827 | DMD 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 |
20110217011 | HIGH 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 |
20110229101 | Single-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 |
20110243518 | NON-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 GeO | 10-06-2011 |
20110274398 | MULTICORE 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 |
20110286710 | Single Mode Optical Fiber - An optical transmission fiber comprises a central core having an index difference Δn | 11-24-2011 |
20110293232 | Hydrogen-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 |
20110305423 | Multimode Fiber - A multimode optical fiber comprises a central core having an alpha profile, a depressed cladding having a portion in continuity with the alpha profile of the central core and a stepped portion, and an outer cladding. The alpha profile is obtained by co-doping at least two dopants. A multimode fiber for Ethernet optical system with an improved bandwidth is thus obtained. | 12-15-2011 |
20120008907 | OPTICAL 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 |
20120014654 | OPTICAL 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 |
20120063734 | MULTIMODE 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 |
20120076465 | LOW 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 |
20120087625 | FIBER 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 Δ | 04-12-2012 |
20120087626 | MULTI-CORE OPTICAL FIBRE - A multi-core optical fibre | 04-12-2012 |
20120106909 | LARGE EFFECTIVE AREA OPTICAL FIBER WITH LOW BEND LOSS - An optical fiber includes a central glass core region comprising maximum refractive index delta percent Δ | 05-03-2012 |
20120114292 | MULTI-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 n | 05-10-2012 |
20120141078 | OPTICAL 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 |
20120148207 | Waveguides 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 |
20120177333 | OPTICAL 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 μm | 07-12-2012 |
20120183267 | BANDWIDTH-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 |
20120183268 | Single-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 r | 07-19-2012 |
20120189258 | Microbend-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 |
20120195561 | Multimode 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 |
20120219260 | OPTICAL 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 |
20120230638 | BEND 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 Δ | 09-13-2012 |
20120243843 | Bend-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 r | 09-27-2012 |
20120251062 | 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 r | 10-04-2012 |
20120294576 | LARGE 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 R | 11-22-2012 |
20120294577 | OPTICAL 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 n | 11-22-2012 |
20120308187 | Low 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 n | 12-06-2012 |
20120328255 | Few-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 R | 12-27-2012 |
20130004134 | HIGH-BANDWIDTH MULTIMODE OPTICAL FIBER WITH REDUCED CLADDING EFFECT - The present invention embraces an optical fiber that includes a central core having a graded-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. | 01-03-2013 |
20130028564 | Trench-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 |
20130039626 | MULTIMODE 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 |
20130051747 | METHOD 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 |
20130064514 | Gradient 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 |
20130071079 | Optimized 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 μm | 03-21-2013 |
20130071080 | Optimized 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 μm | 03-21-2013 |
20130071081 | Optimized 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 μm | 03-21-2013 |
20130071082 | HIGH 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 |
20130077926 | MULTIMODE 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 Δ1 | 03-28-2013 |
20130084048 | MULTI-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 |
20130094824 | BEND INSENSITIVE FIBER - Provided is an extreme bending insensitive optical fiber. The optical fiber includes a core comprising a maximum refractive index difference Δn | 04-18-2013 |
20130114934 | GE-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 GeO | 05-09-2013 |
20130114935 | BEND 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 P | 05-09-2013 |
20130136404 | Multicore 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 |
20130136405 | LOW BEND LOSS OPTICAL FIBER - One embodiment of a single mode optical fiber includes:
| 05-30-2013 |
20130136406 | LOW BEND LOSS OPTICAL FIBER - An optical fiber comprising: (I) a germania doped central core region having outer radius r | 05-30-2013 |
20130136407 | LOW BEND LOSS OPTICAL FIBER - According to some embodiments a single mode fiber includes:
| 05-30-2013 |
20130136408 | LOW BEND LOSS OPTICAL FIBER - One embodiment of a single mode optical fiber includes:
| 05-30-2013 |
20130148934 | OPTICAL 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%·μm | 06-13-2013 |
20130170802 | OPTICAL 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 |
20130170803 | OPTICAL 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 |
20130183014 | OPTICAL 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 |
20130195410 | OPTICAL 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 |
20130230289 | CURVATURE INSENSITIVE GRADIENT INDEX MULTI-MORE LIGHT CONDUCTING FIBER - The invention relates to a bend insensitive gradient index multimode light conducting fiber comprising a leakage mode dependent optical core diameter that is uniform over its length and a numerical aperture that is uniform over its length, a core ( | 09-05-2013 |
20130230290 | FEW MODE OPTICAL FIBERS - A few mode optical fiber comprising:
| 09-05-2013 |
20130243381 | MULTI-CORE OPTICAL FIBER - The present invention relates to a multi-core optical fiber including a plurality of cores, in each of which an effective area at the wavelength of 1550 nm, a transmission loss at the wavelength of 1550 nm, a chromatic dispersion at the wavelength of 1550 nm, a cable cutoff wavelength, and a bending loss in a bending radius of 30 mm at the wavelength of 1625 nm are set so as to increase a transmission capacity in each core in a state in which a difference of the transmission loss at the wavelength of 1550 nm between different cores is controlled to at most 0.02 dB/km or less. | 09-19-2013 |
20130243382 | GRADIENT-INDEX MULTIMODE OPTICAL FIBERS FOR OPTICAL FIBER CONNECTORS - A gradient-index multimode optical fiber for use as a stub fiber in an optical fiber connector is disclosed. The fiber is configured to have a minimum group index difference to minimize the adverse effects of multipath interference that can arise in a short, single-mode stub fiber that has a large group index difference. The fiber is also configured to have a mode-field diameter that is substantially the same as that of single-mode optical fibers used as stub fibers. An optical fiber connector that uses the fiber as a stub fiber is also disclosed. | 09-19-2013 |
20130251324 | Large Mode Area Optical Fibers With Bend Compensation - A LMA, single-mode optical fiber comprises a core region, an inner cladding region surrounding the core region, and an outer cladding region surrounding the inner cladding region. The inner cladding region is configured to provide bend compensation. In one embodiment the index profile of the inner cladding region is graded with a slope of γn | 09-26-2013 |
20130287352 | OPTICAL FIBER - An optical fiber comprising a first core, a second core, a third core, and a cladding, wherein the expressions 0.30%≦Δ1≦0.45%, −0.05%≦Δ2≦0.05%, −0.35%≦Δ3≦−0.15%, 2.5≦b/a, 3.5 μm≦a≦4.2 μm, 9 μm≦b≦13 μm, and 4.5 μm≦c−b≦7.0 μm are satisfied, a zero-dispersion wavelength is no less than 1300 nm and no greater than 1324 nm, and transmission loss increase for a wavelength of 1550 nm when the optical fiber is wound around a mandrel with a diameter of 10 mm is no greater than 1 dB/turn. | 10-31-2013 |
20130322836 | MULTIMODE OPTICAL FIBER AND SYSTEM COMPRISING SUCH FIBER - A multimode optical fiber includes a graded index glass core having a diameter in the range of 41 microns to 80 microns, a graded index having an alpha less than 2.04 and a maximum relative refractive index in the range between 0.6% and 1.8%. The cladding includes a depressed-index annular portion. The fiber has an overfilled bandwidth greater than 2.5 GHz-km at 1310 nm. | 12-05-2013 |
20130322837 | MULTIMODE OPTICAL FIBER AND SYSTEM COMPRISING SUCH FIBER - One exemplary multimode optical fiber includes a graded index glass core having a diameter in the range of 41 microns to 80 microns, a graded index having an alpha less than 2.04 and a maximum relative refractive index in the range between 0.6% and 1.8%. The cladding includes a depressed-index annular portion. The fiber has an overfilled bandwidth greater than 2.5 GHz-km at at least one wavelength between 1200 nm and 1700 nm. | 12-05-2013 |
20140003777 | LIGHT FOCUSING STRUCTURES FOR FIBER OPTIC COMMUNICATIONS SYSTEMS AND METHODS OF FABRICATING THE SAME USING SEMICONDUCTOR PROCESSING AND MICRO-MACHINING TECHNIQUES | 01-02-2014 |
20140064686 | MULTIPLE LP MODE FIBER DESIGNS FOR MODE DIVISION MULTIPLEXING - The specification describes modified step index and GRaded INdex (GRIN) fibers with low core relative delta (near 0.8%) which have desirable properties for transmission. These lower delta fibers have lower attenuation losses due to reduced Rayleigh scattering, which is desirable to improve performance in multiple mode multiplexing. The fiber designs include optimized raised triangle profiles, and depressed cladding profiles, to support two and four LP modes. | 03-06-2014 |
20140119701 | MULTIMODE OPTICAL FIBER AND SYSTEMS COMPRISING SUCH FIBER - A multimode optical fiber includes: (i) a graded index glass core having a radius R | 05-01-2014 |
20140140673 | METHOD OF MANUFACTURING OPTICAL FIBER PREFORM, AND OPTICAL FIBER - The present invention relates to a preform manufacturing method and others for effectively reducing variation in refractive index due to chlorine used in manufacture of an optical fiber preform. The manufacturing method includes a dechlorination step carried out between a point of an end time of a dehydration step and a point of a start time of a sintering step, the dechlorination step being a step of heating a porous preform after dehydrated, in an atmosphere containing no chlorine-based dehydrating agent, for a given length of time while maintaining a temperature lower than a sintering temperature, thereby removing chlorine from the porous preform after dehydrated. | 05-22-2014 |
20140178021 | BRIDGE FIBER, COMBINER, AND FIBER LASER DEVICE - A bridge fiber includes a core layer | 06-26-2014 |
20140185996 | BENDING INSENSITIVE SINGLE MODE OPTICAL FIBER - In one aspect of the invention, the bend insensitive single-mode optical fiber includes a core layer and cladding layers having an inner cladding layer, a trench cladding layer and an outer cladding layer sequentially formed surrounding the core layer from inside to outside. For the core layer, the diameter is 7-7.9 μm, and the relative refractive index difference Δ | 07-03-2014 |
20140241684 | LOW ATTENUATION OPTICAL FIBERS WITH AN F-GRADED INDEX CORE - An optical fiber is provided that includes a fiber configured to transmit optical data in a plurality of modes or in a single mode; a core region in the fiber that comprises fluorine-doped silica; and a cladding in the fiber that surrounds the core region and that comprises fluorine-doped silica. The core region has a graded refractive index profile with an alpha of about 0.5 to 5. The core of the fiber may be set with a radius of approximately 6 to 50 microns. The cladding may also comprise one or a plurality of layers, including trench or moat regions of a relatively lower refractive index. Still further, an inner cladding may be doped with fluorine at a concentration greater than that in the core region. An outer cladding can comprise silica with fluorine at a concentration below or equal to that in the inner cladding. | 08-28-2014 |
20140241685 | MULTIMODE OPTICAL FIBERS AND METHODS OF MANUFACTURE THEREOF - The present invention generally relates to the field of fiber optics, and more specifically to optical fibers, methods of manufacturing optical fibers, and methods of classifying optical fibers. In an embodiment, the present invention is a multimode optical fiber which comprises a core and clad material system where the refractive indices of the core and cladding are selected to minimize chromatic dispersion in the 850 nm wavelength window and the refractive index profile is optimized for minimum modal-chromatic dispersion in channels utilizing VCSEL transceivers. Multimode optical fibers according to this embodiment may have increased channel bandwidth. | 08-28-2014 |
20140270670 | Bandwidth-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. | 09-18-2014 |
20140301707 | OPTICAL WAVEGUIDE, MODE SCRAMBLER AND MODE CONDITIONER FOR CONTROLLING MODE POWER DISTRIBUTION - The present disclosure relates to a multimode optical waveguide comprising a cladding and a core. The core of the multimode optical waveguide has a polygonal cross-section. The core forms a coil spun around the longitudinal axis of the cladding. The multimode optical waveguide may be used to realize a mode scrambler and a mode conditioner. | 10-09-2014 |
20140308015 | LOW DIAMETER OPTICAL FIBER - Small-radius coated optical fibers having large mode field diameter and low bending losses. The coated fiber may have an outer radius of 110 μm or less, while providing a mode field diameter of 9.0 μm or greater and a bending loss when wrapped about a 15 mm mandrel of 0.5 dB/km or less at wavelength of 1550 nm. The coated fiber may have a mode field diameter of 9.2 μm or greater and may have a bending loss at 1550 nm of 0.25 dB/km or less when wrapped about a 20 mm mandrel or a bending loss at 1550 nm of 0.02 dB/km or less when wrapped about a 30 mm mandrel. | 10-16-2014 |
20140328565 | MULTIMODE OPTICAL FIBER AND METHOD OF MANUFACTURING THE SAME - The present invention relates to a multimode optical fiber which can provide a smooth cut face suitable for fusion splicing between fibers. The multimode optical fiber has at least a core extending along a central axis and having an α-power refractive index profile, and a cladding, and a residual stress distribution in the core along a radial direction from the central axis has a shape with a maximum at a position intersecting with the central axis. | 11-06-2014 |
20140334787 | BEND INSENSITIVE GRADIENT INDEX MULTI-MODE LIGHT CONDUCTING FIBER - The invention relates to a bend insensitive gradient index multi-mode light conducting fiber comprising a leakage mode dependent optical core diameter that is uniform over its length and a numerical aperture that is uniform over its length, a core ( | 11-13-2014 |
20140334788 | Bend Compensated Filter Fiber - An optical fiber includes a core region having a longitudinal axis. A cladding region surrounds the core region. The core region and cladding region are configured to support and guide the propagation of signal light in a fundamental transverse mode in the core region in the directions of the axis. The fiber has a bend-induced gradient of its equivalent index of refraction indicative of a loss in guidance of the mode. At least a portion of cladding region has a graded index of refraction opposite the bend-induced gradient. The cladding region is configured to have a substantially flat equivalent index in response to a bend of the optical fiber. | 11-13-2014 |
20140341520 | Multimode Optical Fibre - The invention relates to a multimode optical fibre having a refractive index profile, comprising a light-guiding core surrounded by one or more cladding layers. The present invention furthermore relates to an optical communication system comprising a transmitter, a receiver and a multimode optical fibre. | 11-20-2014 |
20150016794 | OPTICAL WAVEGUIDE, OPTICAL WIRING COMPONENT, OPTICAL WAVEGUIDE MODULE AND ELECTRONIC DEVICE - A core layer ( | 01-15-2015 |
20150023642 | HIGH BANDWIDTH MMF AND METHOD OF MAKING - A multimode optical fiber, and a method of making the fiber, are provided according to the following steps and elements: forming a core preform with a graded refractive index that includes silica and an up-dopant; drawing the core preform into a core cane; forming an inner annular segment preform that includes silica soot and an up-dopant surrounding the core cane; and forming a depressed-index annular segment preform that includes silica soot surrounding the inner annular segment preform. The method also includes the steps: forming an outer annular segment preform that includes silica soot and an up-dopant surrounding the depressed-index annular segment preform; doping the inner, depressed-index and outer annular segment preforms simultaneously or nearly simultaneously with a down-dopant; and consolidating the segment preforms simultaneously or nearly simultaneously into inner, depressed-index and outer annular segments. | 01-22-2015 |
20150023643 | GRADIENT OPTICAL POLYMER NANOCOMPOSITES - Gradient index optical materials are formed by drop by drop dispensing of nanoparticle/monomer suspensions. Refractive index variations are defined by nanoparticle concentrations that can vary in three dimensions. Droplets of differing compositions can be mixed, and droplets or layers or droplets are partially cross-linked by exposure to ultraviolet radiation prior to dispensing additional droplets. Gradient index optical elements such as lenses, prisms, and waveguides can be formed in flexible polymer layers. | 01-22-2015 |
20150023644 | ISOTOPICALLY ALTERED OPTICAL FIBER - An optical waveguide having a cladding layer formed of high-purity glass, or a cladding layer formed of high-purity isotope-proportion modified glass, and with a core of high-purity isotope-proportion-modified glass with the index of refraction of the core glass greater than the index of refraction of the cladding glass, said high-purity isotope-proportion-modified core material having a Si-29-isotope proportion at most 4.447% Si-29 (atom/atom) of all silicon atoms in said core, or at least 4.90% of Si-29 (atom/atom) atoms in said core, or having a Ge-73 isotope proportion of at most 7.2% Ge-73 (atom/atom) of all germanium atoms in said core, or at least 8.18% of Ge-73 (atom/atom) of Germanium atoms in said core region. | 01-22-2015 |
20150043877 | OPTICAL DEVICES INCLUDING ASSISTANT LAYERS - A waveguide including a top cladding layer, the top cladding layer including a material having an index of refraction, n1; an assistant layer, the assistant layer positioned adjacent the top cladding layer, the assistant layer including a material having an index of refraction, n2; a core layer, the core layer positioned adjacent the assistant layer, the core layer including a material having an index of refraction, n3; and a bottom cladding layer, the bottom cladding layer positioned adjacent the core layer, the bottom cladding layer including a material having an index of refraction, n4, wherein n1 is less than both n2 and n3, n3 is greater than n1 and n4, and n4 is less than n3 and n2. | 02-12-2015 |
20150049999 | ULTRA-LOW LOSS OPTICAL FIBER - An ultra-low loss optical fiber is provided. The ultra-low loss optical fiber includes a core having the maximum refractive index inside an optical fiber, and placed at the central portion of the optical fiber, a trench having the minimum refractive index inside the optical fiber and encompassing the core, and a cladding encompassing the trench. The core includes a first sub-core layer having the maximum refractive index inside the optical fiber, and placed at the center of the optical fiber, a second sub-core layer having a refractive index lower than that of the first sub-core layer and encompassing the first sub-core layer, and a third sub-core layer having a refractive index lower than that of the second sub-core layer and encompassing the second sub-core layer. | 02-19-2015 |
20150055922 | ALL GLASS METHOD FOR FRUSTRATING INTERNAL REFLECTION IN AN OPTICAL FIBER - The disclosure is directed to an all glass method that frustrates the internal reflection on the outside diameter of an optical fiber's glass cladding thus allowing the light to be directed to a light absorbing material/ medium and allowing the desired light in the core of the fiber to be preserved with no loss. The frustration is achieved by having at least one glass frustrater in glass-to-glass contact with the outermost cladding layer of the optical fiber. The glass frustrater is made of a glass that has a glass transition point lower that both the core and cladding glasses of the fiber. Chalcogenide and phosphate glasses are among the glasses suitable for this application. | 02-26-2015 |
20150104139 | System and Method for Optical Fiber - In one embodiment, an optical fiber includes a first layer having a first refractive index and a second layer surrounding the first layer, where the second layer has a second refractive index, an inner radius, and an outer radius. The optical fiber also includes a third layer surrounding the second layer, where the third layer has a third refractive index, where the first refractive index is less than the second refractive index, where the third refractive index is less than the second refractive index, and where a ratio of the outer radius to the inner radius is less than 1.5. | 04-16-2015 |
20150104140 | GRADED REFRACTIVE INDEX BENDING-RESISTANT MULTIMODE OPTICAL FIBER - A graded refractive index bending-resistant multimode optical fiber includes a core layer and claddings. The core layer has a radius in a range of 20-50 μm; refractive indexes being a gradient-graded refractive index distribution with a distribution exponent a in a range of 1.89-1.97; and a maximum relative refractive index difference (RRID) Δ1% max in a range of 0.9%-2.72%. The claddings has an inner cladding surrounding the core layer, an intermediate cladding surrounding the inner cladding and an outer cladding surrounding the inner cladding. The inner cladding has a radius in a range of 22-57 μm, and an RRID Δ2% in a range of −0.02%-0.02%. The intermediate cladding is a pure quartz glass layer, and has a radius in a range of 32-60 μm, and an RRID Δ3% in a range of −0.01%-0.01%. | 04-16-2015 |
20150110452 | Barbell Optical Fiber And Method Of Making The Same - High aspect ratio core optical fiber designs, which could be semi-guiding, including a core region having a first refractive index and a high aspect ratio elongated cross-section along a slow axis direction, are described. An internal cladding having a second refractive index sandwiches the core and acts as a fast-axis signal cladding. The core has an edge region at both of its short edges that is in contract with edge-cladding regions having a barbell shape. The refractive index of the core regions, the refractive index of the internal claddings, and the refractive index of the edge-cladding regions, are selected so as to maximize the optical power of a lowest-order mode propagating in the fiber core, and to minimize the optical power of the next-order modes in the fiber core. A process to fabricate such a high aspect ratio core fiber is also provided. | 04-23-2015 |
20150117826 | Direct Entangled Triplet-Photon Sources And Methods For Their Design And Fabrication - The present teachings are generally directed to devices and methods for triplet photons generations, and in particular to on-chip integrated sources for generating direct triplet entangled photons. | 04-30-2015 |
20150117827 | GRADED REFRACTIVE INDEX BENDING-RESISTANT MULTIMODE OPTICAL FIBER - A graded refractive index bending-resistant multimode optical fiber includes a core layer and claddings. The core layer has a radius in a range of 22.5-27.5 μm; refractive indexes being a gradient-graded refractive index distribution with a distribution exponent α in a range of 1.99-2.06; and a maximum relative refractive index difference (RRID) Δ1% max in a range of 0.9%-1.3%. The claddings has an inner cladding surrounding the core layer, an intermediate cladding surrounding the inner cladding and an outer cladding surrounding the inner cladding. The inner cladding has a radius in a range of 25.5-34.5 μm, and an RRID Δ2% in a range of −0.02%-0.02%. The intermediate cladding is a pure quartz glass layer, and has a radius in a range of 30.5-49.5 μm, and an RRID Δ3% in a range of −0.01%-0.01%. The outer cladding has a radius in a range of 61.5-63.5 μm, and an RRID Δ4% is in a range of −0.20%-0.30%. | 04-30-2015 |
20150139595 | DEVICE FOR CONVERTING THE TRANSVERSE SPATIAL PROFILE OF INTENSITY OF A LIGHT BEAM, PREFERABLY USING A MICROSTRUCTURED OPTICAL FIBRE - A device for converting transverse spatial profile of intensity of a light beam, using a microstructured optical fiber. Transverse dimensions of the fiber vary longitudinally and both its ends have opto-geometrical parameters such that at the wavelength of the beam the fiber has a fundamental mode having two different profile shapes at its two ends. Thus by introducing the beam with one of the profiles through one of the two ends, the beam emerges through the other end with the other profile, whose shape is different from that of the profile of the introduced beam. | 05-21-2015 |
20150139596 | MULTICORE FIBER AND METHOD OF MANUFACTURE OF THE SAME - A multicore fiber includes a plurality of cores and a cladding that encloses the plurality of the cores. The plurality of the cores is arranged and disposed on a linear line passed through the center of the cladding. A difference in the cutoff wavelength between an outer core located at the outermost position and an inner core located next to the outer core is set at a wavelength of 100 nm or less. | 05-21-2015 |
20150147039 | MULTICORE FIBER - A multicore fiber according to an aspect of the present invention includes a plurality of cores and a cladding surrounding the plurality of the cores. In this multicore fiber, a pair of cores is arranged and disposed on a linear line passed through the center of the cladding, the pair of the cores being adjacent to each other and having refractive indexes varied differently from the cladding to the cores. | 05-28-2015 |
20150293300 | Single-Mode, Bend-Compensated, Large-Mode-Area Optical Fibers Designed To Accomodate Simplified Fabrication And Tighter Bends - Described is a general strategy of bend-compensated, single-mode LMA fibers extended into a regime with higher total index contrast and where a larger gradient is used to cancel the perturbation of a tighter anticipated bend. | 10-15-2015 |
20150309250 | FEW MODED OPTICAL FIBER AND SYSTEM INCORPORATING SUCH - One embodiment of the disclosure relates to a few moded optical fiber comprises: a glass graded index core having alpha profile such that 2.0≦α≦2.15, a diameter D | 10-29-2015 |
20150316712 | OPTICAL FIBER CONTAINING AN ALKALI METAL OXIDE AND METHODS AND APPARATUS FOR MANUFACTURING SAME - Disclosed is an optical fiber having a core with an alkali metal oxide dopant in an peak amount greater than about 0.002 wt. % and less than about 0.1 wt. %. The alkali metal oxide concentration varies with a radius of the optical fiber. By appropriately selecting the concentration of alkali metal oxide dopant in the core and the cladding, a low loss optical fiber may be obtained. Also disclosed are several methods of making the optical fiber including the steps of forming an alkali metal oxide-doped rod, and adding additional glass to form a draw perform. Preferably, the draw preform has a final outer dimension (d | 11-05-2015 |
20150316715 | MULTI-CORE FIBER - A multicore fiber includes six or more of core elements having a core, a first clad surrounding the outer circumferential surface of the core and a second clad surrounding the outer circumferential surface of the first clad, and includes a clad surrounding the core elements. All of expressions are satisfied: n | 11-05-2015 |
20150316716 | OPTICAL FIBER WITH DISTRIBUTED BEND COMPENSATED FILTERING - An optical fiber includes a core region having a longitudinal axis. At least a portion of the core region has a substantially helical shape about a helical axis. The longitudinal axis may be substantially tangential to a helical bend in the optical fiber. A cladding region surrounds the core region. The core region and cladding region may be configured to support and guide the propagation of signal light in a fundamental transverse mode in the core region in the direction of the longitudinal axis. The fiber has a bend-induced gradient in its equivalent index of refraction over the portion of the core region. The fiber has a bend-induced equivalent index of refraction. At least a portion of cladding region has a graded refractive index opposite that of the bend-induced gradient. The cladding region may be configured to have a substantially flat equivalent index in response to a helical bend of the optical fiber. | 11-05-2015 |
20150323735 | MULTICORE FIBER - A multicore fiber according to the present invention includes a plurality of cores and a cladding enclosing the plurality of the cores. The plurality of the cores has two cores or greater forming a first plurality of cores linearly arranged to form a first row on one side based on a plane passed through the center axis of the cladding and three cores or greater forming a second plurality of cores arranged in parallel with the first plurality of the cores to form a second row on the other side based on the plane. The cores configuring the first plurality of the cores and the cores configuring the second plurality of the cores are disposed on lines orthogonal to the plane. | 11-12-2015 |
20150331180 | OPTICAL FIBER AND OPTICAL FIBER SILICA GLASS BASE MATERIAL - An optical fiber silica glass base material comprising a core formed of silica glass doped with a positive dopant that increases a refractive index; an intermediate layer adjacent to the core and surrounding the core on a radial outside thereof; a trench layer adjacent to the intermediate layer, surrounding the intermediate layer on a radial outside thereof, and formed of silica glass doped with a negative dopant that decreases a refractive index; and a cladding layer adjacent to the trench layer, surrounding the trench layer on a radial outside thereof, and formed of silica glass. Thickness of the intermediate layer in a radial direction is greater than thickness of the trench layer, and a region of the intermediate layer nearer the core is more heavily doped with the positive dopant and/or a region of the intermediate layer nearer the trench layer is more heavily doped with the negative dopant. | 11-19-2015 |
20150331181 | MULTIMODE OPTICAL FIBER AND SYSTEM INCLUDING SUCH - A multimode optical fiber comprising: a core with a diameter D | 11-19-2015 |
20150362670 | BEND COMPENSATION IN TELECOMMUNICATIONS OPTICAL FIBERS - Optical fiber profiles are shown in which the optical fiber has a large mode area, but is nevertheless sufficiently bend-insensitivity to comply with technical specifications for telecommunication optical fibers. The optical fibers meet two bend-loss conditions. First, they meet tight bend conditions, which reflects macro-bending due to coiling or bending of the optical fiber. Second, these optical fibers meet cable bend conditions, which reflect macro-bending conditions that are introduced as a result of cabling. By satisfying the tight bend-loss condition and then adjusting for the cable bend-loss condition, the optical fiber permits larger effective areas than normally achievable with only bend-compensation designs. | 12-17-2015 |
20150362671 | ISOTOPICALLY ALTERED OPTICAL FIBER - An optical waveguide having a cladding layer formed of high-purity glass, or a cladding layer formed of high-purity isotope-proportion modified glass, and with a core of high-purity isotope-proportion-modified glass with the index of refraction of the core glass greater than the index of refraction of the cladding glass, said high-purity isotope-proportion-modified core material having a Si-29-isotope proportion at most 4.447% Si-29 (atom/atom) of all silicon atoms in said core, or at least 4.90% of Si-29 (atom/atom) atoms in said core, or having a Ge-73 isotope proportion of at most 7.2% Ge-73 (atom/atom) of all germanium atoms in said core, or at least 8.18% of Ge-73 (atom/atom) of Germanium atoms in said core region. | 12-17-2015 |
20160025923 | Multimode Optical Fiber and Methods of Manufacturing Thereof - The present invention generally relates to the field of fiber optics, and more particularly, to apparatuses, systems, and methods directed towards improving effective modal bandwidth within a fiber optic communication environment. In an embodiment, a multimode optical fiber in accordance with the present invention comprises a core and cladding material system where the refractive indices of the core and cladding are selected to modify the shape of the profile dispersion parameter, y, as a function of wavelength in such a way that the alpha parameter (α-parameter), which defines the refractive index profile, produces negative relative group delays over a broad range of wavelengths. The new shape of the profile dispersion parameter departs from traditional fibers where the profile dispersion parameter monotonically decreases around the selected wavelength that maximizes the effective modal bandwidth (EMB). | 01-28-2016 |
20160041332 | Multimode Optical Fiber and Methods of Use and Design Thereof - The present invention relates generally to multimode optical fibers (MMFs) and methods for optimizing said MMFs for transmission for at least two optical wavelengths. In an embodiment, the present invention is a multimode optical fiber optimized for multi-wavelength transmission in communication systems utilizing VCSEL transceivers, where the MMF has a bandwidth designed to maximize channel reach for multiple wavelengths, and/or where the MMF minimizes for wavelength dependent optical power penalties at one or more wavelength. | 02-11-2016 |
20160124143 | HYDROGEN-RESISTANT OPTICAL FIBER - Embodiments of the invention relate to a hydrogen-resistant optical fiber with a core having a central axis. The core may include only silica, or only silica and fluorine, while a cladding region surrounding the core may be made of silica and fluorine, along with at least one of germanium, phosphorus, and titanium. | 05-05-2016 |
20160139333 | BENDING INSENSITIVE SINGLE-MODE OPTICAL FIBER - In one aspect of the invention, the bend insensitive single-mode optical fiber includes a core layer and cladding layers having an inner cladding layer, a trench cladding layer and an outer cladding layer sequentially formed surrounding the core layer from inside to outside. For the core layer, the diameter is 7-7.9 μm, and the relative refractive index difference Δ | 05-19-2016 |
20160147012 | BEND-INSENSITIVE MULTIMODE OPTICAL FIBER - A bend-insensitive multimode optical fiber includes a core layer, and cladding layers surrounding the core layer. The core layer has a parabolic refractive index profile with α being 1.9-2.2, a radius being 23-27 μm, and a maximum relative refractive index difference being between 0.9-1.2%. The inner cladding layer has a width being 1-3 μm and a relative refractive index difference being between −0.05% and 0.1%. The trench cladding layer has a width being 2-5 μm and a relative refractive index difference being between −1% and −0.3%. The core layer is a Ge/F co-doped silica glass layer, where an F doping contribution at a central position of the core layer is less than or equal to 0%, an F doping contribution at an edge portion of the core layer is greater than or equal to −0.45%. The outer cladding layer is a pure silica glass layer. | 05-26-2016 |
20160147013 | BEND-INSENSITIVE MULTIMODE OPTICAL FIBER WITH REDUCED IMPACT OF LEAKY MODES - A multimode optical fiber is provides, which includes an optical core and an optical cladding surrounding the optical core. The optical core has a refractive graded-index profile. The optical cladding includes: an inner layer surrounding the optical core, an intermediate layer, called a “depressed trench”, surrounding the inner layer, and an outer layer surrounding the depressed trench and having a constant refractive index. The depressed trench has a width W and a negative refractive index difference Δn | 05-26-2016 |
20160252674 | Bend-Resistant Multimode Optical Fiber | 09-01-2016 |
20170233283 | SYSTEM AND METHOD FOR PRODUCING VORTEX FIBER | 08-17-2017 |
20170235044 | Multimode Optical Fiber with High Bandwidth Over an Extended Wavelength Range, and Corresponding Multimode Optical System | 08-17-2017 |
20180024291 | LOW BEND LOSS SINGLE MODE OPTICAL FIBER WITH CHLORINE UPDOPED CLADDING | 01-25-2018 |