Entries |
Document | Title | Date |
20080199137 | Optical Fiber Cable and Method for Modifying the Same - Disclosed is an optical fiber cable that includes a main tube. A guide tube, which includes at least one optical element, is positioned within the main tube's central space. A compressible element is also positioned within the main tube's central space. To reduce the adverse effects of ice formation within the optical fiber cable, the compressible element more readily deforms than do the guide tube and main tube. Also disclosed is a method for modifying a conventional optical fiber cable with a compressible element according to the present invention. | 08-21-2008 |
20080205839 | 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+10 log [(1−e | 08-28-2008 |
20080226245 | Curable Resin Composition for Light Guide Formation, Curable Dry Film for Light Guide Formation, Cured Resin and Light Guide - Disclosed is an optical waveguide-forming curable resin composition and optical waveguide-forming curable dry film which are capable of forming cured resin articles that have high heat resistance, excellent mechanical strength and high transparency, and possess properties required for forming optical waveguides, such as low thermal expansion, low transmission loss, etc. | 09-18-2008 |
20080226246 | OPTICAL FIBER AND OPTICAL-FIBER TRANSMISSION LINE - An optical fiber transmits at least a signal light having a wavelength of 1550 nanometers in a fundamental propagation mode. The optical fiber has, a cutoff wavelength equal to or longer than 1550 nanometers, a wavelength dispersion of 4 ps/nm/km to 7 ps/nm/km in the fundamental propagation mode at the wavelength of 1550 nanometers, a dispersion slope of a positive value equal to or smaller than 0.03 ps/nm | 09-18-2008 |
20080260338 | Optical fiber having wave-guiding rings - A waveguide includes a cladding region that has a refractive index that is substantially uniform and surrounds a wave-guiding region that has an average index that is close to the index of the cladding. The wave-guiding region also contains a thin ring or series of rings that have an index or indices that differ significantly from the index of the cladding. The ring or rings enable the structure to guide light. | 10-23-2008 |
20080260339 | Manufacture of depressed index optical fibers - Described herein is a method for making a depressed index cladding for the inner cladding of an optical fiber. The method involves making the depressed index cladding in two steps. The innermost portion of the inner cladding is produced using a soot method, thereby deriving the advantages of the soot method for the region of the cladding that carries the most optical power, then forming the remaining portion of the inner cladding layer using a rod-in-tube step. This method effectively marries the advantages and disadvantages of both methods. | 10-23-2008 |
20080273851 | Waveguide configuration - A waveguide configuration comprising a core, a first cladding, a second cladding, and a buffer. The core includes an index of refraction and an acoustic shear velocity. The first cladding extends about the core and has an acoustic shear velocity which is less than that of the core and an index of refraction which is less than the core. The second cladding extends about the first cladding. The second cladding has an acoustic shear velocity which is greater than that of the first cladding and less than the acoustic shear velocity of the core. The second cladding has an index of refraction which is less than that of an optical mode. The buffer extends about the second cladding. | 11-06-2008 |
20080279518 | OPTICAL WAVEGUIDE AND METHOD OF MANUFACTURING THE SAME, AND METHOD OF MANUFACTURING OPTICAL/ELECTRICAL HYBRID SUBSTRATE - An optical waveguide includes an optical waveguide main body and mirrors. The optical waveguide main body includes a first cladding layer, a second cladding layer and a core portion provided between the first cladding layer and the second cladding layer. The optical waveguide main body has a first region in which the core portion and the mirrors are arranged and the light signal is transmitted, and a second region arranged on both sides of the first region and not contributing to a transmission of a light signal. Through vias that pass through the optical waveguide main body is provided in the second region. The first region on a side that faces the light emitting element or the light receiving element is protruded larger than the second region on a side that faces the light emitting element or the light receiving element. | 11-13-2008 |
20080285929 | OPTICAL FIBER - A tension-absorbing cladding layer is formed around a cladding layer, with a refractive index equal to that of a center core region or higher. The center core region has a relative refractive index difference of −0.1% to 0% with respect to a pure silica glass, a chlorine concentration of wt % to 0.10 wt %, and a fluorine concentration of 0.10 wt % to 0.30 wt %. The tension-absorbing cladding layer has a relative refractive index difference of 0% to 0.05% with respect to the pure silica glass and a chlorine concentration of 0.15 wt % or lower. A ratio of an outer diameter of the tension-absorbing cladding layer to an outer diameter of the cladding layer is 1.10 to 1.40. | 11-20-2008 |
20080285930 | Method for Making an Optical Fiber Comprising Nanoparticles and Preform Used in the Manufacture of Such a Fiber - The invention concerns a method for making an optical fiber ( | 11-20-2008 |
20080292256 | Optical Fiber with Tin Doped Core-Cladding Interface - The present invention concerns an optical fiber | 11-27-2008 |
20080292257 | Optical fiber and optical transmission line and optical communication system including such optical fiber - Optical fibers to form an optical transmission line suitable for WDM transmission in a wide-spreading wavelength band, having the following characteristics and parameters: a dispersion in absolute value of 0.5 ps/nm/km to 9 ps/nm/km in a wavelength band of 1430 nm to 1625 nm, a dispersion slope in absolute value of 0.04 ps/nm | 11-27-2008 |
20080304800 | Optical fiber with large effective area - An optical fiber comprising: a glass core extending from a centerline to a radius R | 12-11-2008 |
20080310807 | OPTICAL FIBER AND OPTICAL-FIBER TRANSMISSION LINE - An optical fiber transmits at least a signal light having a wavelength of 1550 nanometers in a fundamental propagation mode. The optical fiber has a cutoff wavelength equal to or longer than a wavelength of 1550 nanometers, a wavelength dispersion in the fundamental propagation mode at the wavelength of 1550 nanometers larger than 0 ps/nm/km, and a dispersion slope in the fundamental propagation mode at the wavelength of the signal light equal to or smaller than −0.05 ps/nm | 12-18-2008 |
20090041415 | DOUBLE-CORE OPTICAL FIBER - A double core optical fiber is provided, in which single mode signal light and multimode signal light can be transmitted and a multimode transmission of the signal light guided through the core can be reduced even when the optical fiber is bent. The double core optical fiber of the present invention includes a core ( | 02-12-2009 |
20090052854 | OPTICAL FIBER AND WAVEGUIDE - An optical fiber in which the macro-bending loss is lowered while an MFD is maintained large, and a waveguide including the optical fiber. The optical fiber includes a core region doped with an impurity; a first cladding region formed as a layer around the core region and including holes as microstructures; and a second cladding region formed as a layer around the first cladding region and made of a homogeneous material. A relative refractive-index difference Δ1 between the core region and the second cladding region is equal to or higher than 0.01% and lower than 0.3%. A total cross-sectional area of the holes in the first cladding region with respect to a total cross-sectional area of the core region, the first cladding region, and the second cladding region is equal to or smaller than 20%. A waveguide is formed using the optical fiber. | 02-26-2009 |
20090052855 | OPTICAL FIBER AND WAVEGUIDE - A core region is doped with an impurity. A first cladding region is formed in a layered structure around the core region, including a microstructure. A second cladding region is formed in a layered structure around the first cladding region, including a homogeneous material. A relative refractive-index difference Δ1 between the core region and the second cladding region is equal to or more than 0.4% and equal to or less than 1.0%. | 02-26-2009 |
20090060437 | Bend insensitivity in single mode optical fibers - An optical fiber that is relatively insensitive to bend loss comprises a core region and a cladding region configured to support and guide the propagation of light in a fundamental transverse mode, the cladding region including (i) an outer cladding region having a refractive index less than that of the core region, (ii) an annular cladding pedestal region having a refractive index higher than that of the outer cladding region and comparable to that of the core region, and (iii) an annular cladding inner trench region disposed between the core region and the pedestal region, the inner trench region having a refractive index less than that of the outer cladding region. In one embodiment, the fiber also includes a (iv) an annular cladding outer trench region disposed between the pedestal region and the outer cladding region, the outer trench region having a refractive index less than that of the outer cladding region. In addition, to suppress HOMs the pedestal region is configured to resonantly couple at least one other transverse mode of the core region to at least one transverse mode of the pedestal region. Such fiber is advantageously used as access fiber, but may have other applications, such as sensor fiber. | 03-05-2009 |
20090060438 | OPTICAL FIBER AND PRODUCTION METHOD THEREOF - An optical fiber, which has a zero-material dispersion wavelength equal to or greater than 2 μm, and a high nonlinear susceptibility χ | 03-05-2009 |
20090148112 | OPTICAL FIBER - A silica-based optical fiber includes a core and a cladding that is formed on an outer circumference of the core. The core includes three or more layers including a layer doped with at least one of germanium and fluorine, and a concentration of the germanium or the fluorine in each of the layers is controlled in such a manner that a Brillouin gain spectral peak is spread into a plurality of peaks on a Brillouin gain spectrum. With this scheme, an optical fiber is provided, which has stable characteristics in the longitudinal direction, and which has a high SBS threshold so that generation of the SBS can be effectively suppressed. | 06-11-2009 |
20090148113 | Large Effective Area Optical Fiber - An optical fiber comprising: (i) a glass core ( | 06-11-2009 |
20090169162 | OPTICAL FIBER HAVING CLADDING SCATTERING CENTERS - In an optical fibre ( | 07-02-2009 |
20090169163 | 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. | 07-02-2009 |
20090196560 | POLYMER CLAD OPTICAL FIBER - A polymer clad optical fiber is provided in which, if the diameter of an inner core is taken as a | 08-06-2009 |
20090232463 | Low loss optical fiber designs and methods for their manufacture - The specification describes an improved optical fiber produced by a hybrid VAD/MCVD process. The core of the fiber is produced using VAD and the inner cladding layer has a depressed index and is produced using MCVD. In preferred embodiments, the optical power envelope is essentially entirely contained in VAD produced core material and the MCVD produced depressed index cladding material. Optical loss is minimized by confining most of the optical power to the VAD core where OH presence is low, as well as by maximizing the optical power in the un-doped silica region. The MCVD substrate tube material is essentially devoid of optical power. | 09-17-2009 |
20090252469 | Dispersion-Shifted Optical Fiber - A dispersion-shifted optical fiber (NZDSF) includes a central core (r | 10-08-2009 |
20090263091 | OPTICAL FIBER - A relative refractive index difference Δ1 between a center core region and a cladding layer is 0.30% to 0.35%, a relative refractive index difference Δ2 between an outer core layer and the cladding layer is −0.10% to −0.04%, and Δ | 10-22-2009 |
20090263092 | Optical Fiber - An improved optical fiber achieves both reduced bending and microbending losses, as well as a much higher Brillouin threshold, as compared to standard transmission fibers. The optical fiber comprises a core including at least two dopants and having a refractive index difference Δn | 10-22-2009 |
20090274428 | Optical Fiber and a Method of Making - According to one example of the invention an optical fiber comprises: (i) a silica based core, said core having a core diameter greater than 80 μm and a numerical aperture NA≧0.24; and (ii) a silica based cladding in contact with and surrounding the core and having a second index of refraction n | 11-05-2009 |
20090279835 | 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 | 11-12-2009 |
20090279836 | Bend-Insensitive Single-Mode Optical Fiber - 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 | 11-12-2009 |
20090290841 | Reduced Bend Sensitivity and Catastrophic Bend Loss In Single Mode Optical Fibers and Method of Making Same - An optical fiber that is relatively insensitive to bend loss and alleviates the problem of catastrophic bend loss comprises a core region and a cladding region configured to support and guide the propagation of light in a fundamental transverse mode. The cladding region includes (i) an outer cladding region, (ii) an annular pedestal (or ring) region, (iii) an annular inner trench region, and (iv) an annular outer trench region. The pedestal region and the outer cladding region each have a refractive index relatively close to that of the outer cladding region. In order to suppress HOMs the pedestal region is configured to resonantly couple at least one (unwanted) transverse mode of the core region (other than the fundamental mode) to at least one transverse mode of the pedestal region. In a preferred embodiment, the fiber is configured so that, at a signal wavelength of approximately 1550 nm, its bend loss is no more than about 0.1 dB/turn at bend radius of 5 mm and is no more than about 0.02 dB/turn at a bend radius of 10 mm. In addition, in one embodiment, the core region also includes an inner core region and an annular outer core (or shelf) region surrounding the inner core region. The outer core region extends radially a distance of less than 9 μm from the fiber axis. In another embodiment, the inner trench region includes an annular inner portion and an annular outer (or step) portion surrounding said inner portion. The refractive index of the step portion is greater than that of the inner portion. In a preferred embodiment, both of the foregoing features of the core region and the inner trench region are incorporated in the fiber. Also described are multi-tube fabrication techniques for making such fibers. | 11-26-2009 |
20090297108 | OPTICAL WAVEGUIDE SUBSTRATE WITH OPTICAL FIBER FIXATION GROOVE, PROCESS FOR ITS PRODUCTION, STAMPS FOR USE IN THIS PRODUCTION PROCESS, AND OPTO-ELECTRONIC HYBRID INTEGRATED MODULE INCLUDING SAID OPTICAL WAVEGUIDE SUBSTRATE - An optical waveguide substrate with an optical fiber fixation groove, including an optical waveguide which contains a lower cladding layer on a base substrate, wherein the lower cladding layer has an optical fiber fixation groove and a core groove, and a weir is provided between the optical fiber fixation groove and the core groove. The optical waveguide substrate with an optical fiber fixation groove is produced by forming a lower cladding layer on a base substrate using a male stamp produced from a female stamp and then successively forming a core layer and an upper cladding layer thereon. The stamp for use in such a production process includes concave portions or convex portions, corresponding to the optical fiber fixation groove and the core groove, as well as a convex portion or a concave portion corresponding to the weir. An opto-electronic hybrid integrated module includes the optical waveguide substrate with an optical fiber fixation groove. | 12-03-2009 |
20090317042 | RARE EARTH-DOPED CORE OPTICAL FIBER AND MANUFACTURING METHOD THEREOF - A rare earth-doped core optical fiber of the present invention includes a core comprising a silica glass containing at least aluminum and ytterbium, and a clad provided around the core and comprising a silica glass having a lower refraction index than that of the core, wherein the core has an aluminum concentration of 2% by mass or more, and ytterbium is doped into the core at such a concentration that the light absorption band which appears around a wavelength of 976 nm in the light absorption band by ytterbium contained in the core shows a peak light absorption rate of 800 dB/m or less. | 12-24-2009 |
20090324186 | PHOTONIC BAND-GAP FIBER - A photonic band-gap fiber comprises a first core having a refractive index that is not higher than a refractive index of a clad; a second core that is disposed so as to surround the first core and has a refractive index that is lower than the refractive index of the first core; a clad that surrounds the second core; and a periodic structure portion that is disposed in the clad in a vicinity of the second core and is constituted by high-refractive index portions that have a refractive index higher than that of clad and form the periodic structure, and the periodic-structure portion functions as a wave-length filter. By the function of the periodic structure portion as a wave-length filter, it is possible to reduce the propagation loss of the transmission wavelength and increase the propagation loss of the cutoff wavelength. | 12-31-2009 |
20100021116 | Single Mode Optical Fiber - A single mode optical fiber comprises: (i) a segmented core having at least three segments and (ii) a silica based clad layer surrounding and in contact with the core, the clad layer having a refractive index n | 01-28-2010 |
20100021117 | Single-Mode Optical Fiber - Disclosed is an optical transmission fiber having reduced bending and microbending losses that is commercially usable in FTTH or FTTC transmission systems. | 01-28-2010 |
20100027951 | 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 | 02-04-2010 |
20100067860 | RARE EARTH-DOPED CORE OPTICAL FIBER - A rare earth-doped core optical fiber includes a core comprising a silica glass containing at least aluminum and ytterbium, a clad provided around the core and comprising a silica glass having a lower refraction index than that of the core, and a polymer layer provided on the outer circumference of the clad and having a lower refractive index than that of the clad, wherein aluminum and ytterbium are doped into the core such that a loss increase by photodarkening, T | 03-18-2010 |
20100104249 | PLASTIC GLASS OPTICAL FIBER - A plastic glass optical fiber includes a glass core (diameter a | 04-29-2010 |
20100189400 | Single-Mode Optical Fiber - A single-mode optical fiber possesses, at a wavelength of 1550 nanometers, an effective area greater than about 90 μm | 07-29-2010 |
20100247047 | ACTIVE OPTICAL FIBER AND METHOD FOR FABRICATING AN ACTIVE OPTICAL FIBER - A section of active optical fiber ( | 09-30-2010 |
20100247048 | OPTICAL FIBER AND METHOD FOR FABRICATING THE SAME - An optical fiber includes: a core ( | 09-30-2010 |
20100284658 | Optical fiber, optical transmission line, optical module, and optical transmission system - The present invention relates to an optical fiber which has a structure for further increasing an FOM (=|dispersion|/loss) and which can be applied to a dispersion compensation module. The optical fiber is mainly composed of silica glass and has a core region including a center of an optical axis, a depressed region surrounding the core region, a ring region surrounding the depressed region, and a cladding region surrounding the ring region and doped with F. As compared with the refractive index of pure silica glass, a relative refractive index difference of the core region is greater than 2% but less than 3%, a relative refractive index difference of the depressed region is −1% or more but −0.5% or less, a relative refractive index difference of the ring region is 0.01% or more but 0.24% or less, and a relative refractive index difference of the cladding region is −0.3% or more but −0.1% or less. The FOM at the wavelength of 1550 nm is 250 ps/nm/dB or more. | 11-11-2010 |
20100284659 | FILTER FIBER FOR USE IN RAMAN LASING APPLICATIONS AND TECHNIQUES FOR MANUFACTURING SAME - An optical waveguide has a refractive index variation that is structured to provide the fiber, over a wavelength operating range, with an effective area supporting multiple Stokes shifts and with a negative dispersion value at a target wavelength within the wavelength operating range. The refractive index variation is further structured to provide the fiber with a finite LP | 11-11-2010 |
20100296785 | CABLE WITH INTERMEDIATE MEMBER DISCONNECTION SECTIONS - A cable is provided including an inner member, an outer member and an intermediate member. The intermediate member may be positioned between the inner member and the outer member and include a number of disconnection sections spaced apart from one another. In some cases, the cable may include two or more inner members. In addition, a method for preparing an end of a cable may be provided, including the steps of removing a portion of an outer member of the cable and applying a tensile force to an intermediate member of the cable comprising a plurality of disconnection sections. The intermediate member of the cable may be sheared at one of the plurality of disconnection sections, thereby exposing a portion of an inner member of the cable | 11-25-2010 |
20100296786 | OPTICAL FIBERS - An optical fiber suitable for high-capacity transmission having a large effective core area, a low bending loss, and capable of single mode operation at 1550 nm is provided. The optical fiber | 11-25-2010 |
20100329618 | 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. | 12-30-2010 |
20110026891 | Single mode optical fibers and modular method of making same - An optical fiber that concurrently satisfies G.657 and G.652 standards comprises a core region and a cladding region configured to support and guide the propagation of light in a fundamental transverse mode, the cladding region including (i) an outer cladding region having a refractive index n | 02-03-2011 |
20110033162 | RARE EARTH-DOPED FIBER OPTIC DEVICE FOR EMITTING OR AMPLIFYING A SIGNAL IN THE "S" BAND - Device for the emission or amplification of a signal, comprising an optical fibre ( | 02-10-2011 |
20110038587 | MULTI-CLAD OPTICAL FIBER - A chalcogenide multi-clad optical fiber having a core, a first cladding and one or more subsequent claddings including a chalcogenide glass. The optical fiber may be capable of transmitting visible and inferred light and may be used for a wide variety of semiconductor applications. | 02-17-2011 |
20110091177 | Double Clad Optical Fiber Having Ring Core Surrounding Core For High Power Operation - Optical fiber apparatus having a wavelength of operation, that comprises an optical fiber including a core comprising an active material for providing light having the operating wavelength responsive to the optical apparatus receiving pump optical energy having a pump wavelength; a cladding disposed about the core; at least one region spaced from the core; and wherein the optical fiber is configured and arranged such that at the wavelength of operation the optical fiber can propagate a plurality of modes and wherein the optical fiber comprises a fundamental mode that is primarily a mode of the core and at least one higher order mode (HOM) that is a mixed mode of a selected mode of the core and of a selected mode of the at least one region. | 04-21-2011 |
20110091178 | DOUBLE CLAD OPTICAL FIBER HAVING RING CORE SURROUNDING CORE FOR HIGH POWER OPERATION - An optical fiber apparatus having a wavelength of operatic comprises an optical fiber comprising a core; a pump cladding disposed about the core for receiving pump optical energy having a pump wavelength; and a second cladding disposed about for tending to confine pump optical energy to the pump cladding. The core can comprise a rare earth material for providing optical energy having the wavelength of operation responsive to the optical fiber receiving the pump optical energy, and the fiber can further comprise at least one ring core spaced from the core, the ring core defined by inner and outer diameters and comprising the cross sectional area therebetween. The ring core can comprise an absorbing material for absorbing optical energy having the wavelength of operation. At the wavelength of operation the optical fiber can comprise a fundamental mode that is primarily a mode of the core and at least one higher order mode (HOM) that is a mixed mode of a selected mode of the core and of a selected mode of the ring core, the selected modes being of the same azimuthal order. The mixed mode can be suppressed relative to the fundamental mode. | 04-21-2011 |
20110097049 | Optical Fiber with Multiple Ring-Shaped Core Regions - Optical apparatus, comprising an optical fiber having a wavelength of operation, the optical fiber comprising an inner core, the inner core supporting a fundamental mode and at least first and second higher order modes (HOMs) at the wavelength of operation; a first ring-shaped core region spaced from and disposed about the inner core; a second ring-shaped core region spaced from and disposed about the ring-shaped core region; and wherein the optical fiber is configured and arranged such that the first HOM optically interacts with the first ring-shaped core region and the second HOM optically interacts with the second ring-shaped core region. | 04-28-2011 |
20110129191 | LARGE EFFECTIVE AREA FIBER - An optical fiber with a glass core extending from a centerline to a radius R | 06-02-2011 |
20110135264 | Bend-Insensitive Single-Mode Optical Fiber - The present invention embraces a single-mode optical fiber that, at a wavelength of 1550 nanometers, has bending losses of 0.15 dB/turn or less for a radius of curvature of 5 millimeters. | 06-09-2011 |
20110164852 | Single-Mode Optical Fiber - Disclosed is an optical transmission fiber having reduced bending and microbending losses that is commercially usable in FTTH or FTTC transmission systems. | 07-07-2011 |
20110176783 | OPTICAL FIBER AND METHOD FOR FABRICATING THE SAME - An optical fiber ( | 07-21-2011 |
20110182557 | MULTI-CORE FIBER - The present invention relates to a multi-core fiber having a structure for effectively suppressing crosstalk increase between cores caused by bending within an allowable range. The multi-core fiber comprises a plurality of types of cores respectively extending along an optical axis and a cladding region, and the effective refractive index of each core is set so that, in all pairs of cores of different types, a relative refractive index difference between an effective refractive index of a core of a certain type and an effective refractive index of a core of another type satisfies a condition regulated according to a core spacing between cores and a bending radius. | 07-28-2011 |
20110188826 | Non-Zero Dispersion Shifted Optical Fiber Having a Large Effective Area - A non-zero dispersion shifted optical fiber (NZDSF) includes a central core, an inner cladding, and an outer cladding. The central core has an outer radius r | 08-04-2011 |
20110206331 | MULTI-CORE OPTICAL FIBER - A multi-core optical fiber includes a plurality of core portions. The diameter of each of the core portions is 12 micrometers or smaller, the relative refractive-index difference of the core portions with respect to the cladding portion is 0.2% or larger, the cut-off wavelength is 1.53 micrometers or smaller, the bending loss at a 1.55-micrometer wavelength is 10 dB/m or smaller, the effective core area at a 1.55-micrometer wavelength is 30 μm | 08-25-2011 |
20110211797 | Optical Fiber with Increased Mechanical Strength - An optical fiber having increased mechanical strength is provided. The optical fiber includes an over cladding layer that has a compressive stress of at least 100 MPa. | 09-01-2011 |
20110217012 | Broad-Bandwidth Multimode Optical Fiber Having Reduced Bending Losses - A multimode optical fiber includes a central core, an inner cladding, a buried trench, and an outer cladding (e.g., an outer optical cladding). Typically, the optical fiber's central core is a glass-based central core having an alpha-index profile (i.e., a graded-index profile), an outer radius r | 09-08-2011 |
20110222828 | MULTI-CORE OPTICAL FIBER - The present invention relates to a multi-core optical fiber having a structure for reducing transmission loss and nonlinearity. The multi-core optical fiber comprises plural cores extending along a center axis direction, and a cladding surrounding the peripheries of the plural cores. The cladding is comprised of silica glass doped with fluorine, and each of the plural cores is comprised of silica glass doped with chlorine or pure silica glass. | 09-15-2011 |
20120033924 | Low loss optical fiber designs and methods for their manufacture - The specification describes an improved optical fiber produced by a hybrid VAD/MCVD process. The core of the fiber is produced using VAD and the inner cladding layer has a depressed index and is produced using MCVD. In preferred embodiments, the optical power envelope is essentially entirely contained in VAD produced core material and the MCVD produced depressed index cladding material. Optical loss is minimized by confining most of the optical power to the VAD core where OH presence is low, as well as by maximizing the optical power in the un-doped silica region. The MCVD substrate tube material is essentially devoid of optical power. | 02-09-2012 |
20120057834 | Optical Fiber, Optical Fiber Preform and Method of Fabricating Same - An optical fiber capable of suppressing an increase of a transmission loss after exposure of the optical fiber to hydrogen or deuterium is provided. The optical fiber has a core region, an inner cladding region surrounding the core region, a trench region surrounding the inner cladding region, an outer cladding region surrounding the trench region, and a refractive index varying region arranged between the inner cladding region and the trench region, the refractive index varying region having a refractive index gradually increasing from the trench region to the inner cladding region. | 03-08-2012 |
20120093471 | Low loss optical fiber designs and methods for their manufacture - The specification describes an improved optical fiber produced by a hybrid VAD/MCVD process. The core of the fiber is produced using VAD and the inner cladding layer has a depressed index and is produced using MCVD. In preferred embodiments, the optical power envelope is essentially entirely contained in VAD produced core material and the MCVD produced depressed index cladding material. Optical loss is minimized by confining most of the optical power to the VAD core where OH presence is low, as well as by maximizing the optical power in the un-doped silica region. The MCVD substrate tube material is essentially devoid of optical power. | 04-19-2012 |
20120134637 | MULTI-CORE OPTICAL FIBER AND METHOD OF MANUFACTURING THE SAME - A multi-core optical fiber includes: a plurality of core portions; and a cladding portion positioned so as to surround each of the core portions, wherein each core portion includes a center core portion that has a refractive index greater than that of the cladding portion, a second core portion that is formed so as to surround the center core portion and that has a refractive index less than that of the center core portion, and a depressed portion that is formed so as to surround the second core portion and that has a refractive index less than those of the second core portion and the cladding portion, and an interval distance between the adjacent core portions is set such that optical cross-talk between the core portions for a total length of the multi-core optical fiber is equal to or less than −30 dB at a wavelength of 1.55 μm. | 05-31-2012 |
20120230641 | IN-LINE OPTICAL FIBER DEVICES, OPTICAL SYSTEMS, AND METHODS - An in-line optical device adapted to be bonded in between ends of an optical fiber line is disclosed. The in-line optical device has an inner optical field interaction region, an outer support structure, and at least one radial opening. In some embodiments, a void region substantially surrounds the inner optical field interaction region. Systems including the in-line optical device and methods of making and using the in-line optical device are provided. Numerous other aspects are provided. | 09-13-2012 |
20120288247 | OPTICAL FIBER - Each of a first clad region ( | 11-15-2012 |
20130183016 | MULTI-CORE OPTICAL FIBER AND METHOD OF MANUFACTURING THE SAME - A multi-core optical fiber includes: a plurality of core portions; and a cladding portion positioned so as to surround each of the core portions, wherein each core portion includes a center core portion that has a refractive index greater than that of the cladding portion, a second core portion that is formed so as to surround the center core portion and that has a refractive index less than that of the center core portion, and a depressed portion that is formed so as to surround the second core portion and that has a refractive index less than those of the second core portion and the cladding portion, and an interval distance between the adjacent core portions is set such that optical cross-talk between the core portions for a total length of the multi-core optical fiber is equal to or less than −30 dB at a wavelength of 1.55 μm. | 07-18-2013 |
20130188917 | OPTICAL FIBER AND OPTICAL FIBER PREFORM - An optical fiber containing an alkali metal element and exhibiting low attenuation as well as excellent radiation resistance is provided. The optical fiber of the present invention has a core region and a cladding region enclosing the core region. The core region contains alkali metal elements by an average concentration of 0.2 atomic ppm or more. The attenuation at a wavelength of 1550 nm after irradiating with the radiation of 0.10 Gy or more of cumulative absorbed dose increases by 0.02 dB/km or less as compared with the attenuation exhibited prior to radiation exposure. | 07-25-2013 |
20130243384 | MULTICORE FIBER - A multicore fiber includes a plurality of core elements; and a clad surrounding an outer periphery surface of each of the core elements, and each of the core elements includes a core, a first clad surrounding the outer periphery surface of the core and a second clad surrounding an outer periphery surface of the first clad, and when a refractive index of the core is n | 09-19-2013 |
20130279868 | BENDING-RESISTANT LARGE CORE DIAMETER HIGH NUMERICAL APERTURE MULTIMODE FIBER - A bending-resistant large core diameter high numerical aperture multimode fiber includes a core and a cladding surrounding the core. The core has a radius R1 in a range of 28 to 50 microns, a refractive index profile of a parabola shape with α being in a range of 1.9 to 2.2, and a maximum relative refractive index difference Δ1% max being in a range of 1.9% to 2.5%. The cladding includes an inner cladding and/or a trench cladding, and an outer cladding disposed from the inner to the outer in sequence. The radius R2 of the inner cladding is in a range of 28 to 55 microns, and the relative refractive index difference Δ2% is −0.1% to 0.1%. The radius R3 of the trench cladding is in a range of 28 to 60 microns, and the relative refractive index difference Δ3% is in a range of −0.15% to −0.8%. | 10-24-2013 |
20130294737 | MULTICORE OPTICAL FIBER (VARIANTS) - The invention relates to optical fiber communications. A multicore optical fiber comprises at least two light-guiding cores made of doped fused silica with refractive indices n | 11-07-2013 |
20130302002 | MULTI-CORE OPTICAL FIBER AND METHOD OF OPTICAL TRANSMISSION - A multi-core optical fiber has: a plurality of core portions; a cladding portion that is positioned around each of the plurality of core portions and has a refractive index lower than that of each of the plurality of core portions; and a separation distance between adjacent ones of the plurality of core portions being set so that crosstalk of light between the adjacent core portions over an entire length thereof becomes −15 dB or greater at a wavelength of 1550 nm and a cable cut-off wavelength becomes 1530 nm or less. | 11-14-2013 |
20130308914 | POLARIZATION-MAINTAINING OPTICAL FIBER - A polarization-maintaining optical fiber of the present invention includes a core, a pair of stress-applying parts provided on both sides of the core, and a cladding surrounding the core and the stress-applying parts, and is used in a wavelength range of 400 to 680 nm. The diameter of the cladding is 125 μm, the diameter of the stress-applying part is 33 to 37 μm, a distance between the pair of stress-applying parts is 8.6 to 15.4 μm, a relative refractive index difference between the core and the cladding is 0.35 to 0.45%, and a cut-off wavelength is less than or equal to 400 nm. | 11-21-2013 |
20140003778 | HOLLOW CORE FIBER WITH IMPROVEMENTS RELATING TO OPTICAL PROPERTIES AND ITS USE, METHOD OF ITS PRODUCTION AND USE THEREOF | 01-02-2014 |
20140003779 | MULTI-CORE FIBER, AND MULTI-CORE FIBER CONNECTION METHOD USING THE SAME | 01-02-2014 |
20140010508 | OPTICAL FAN-IN/FAN-OUT DEVICE - A radius of a first core | 01-09-2014 |
20140079363 | DOUBLE CLADDING CRYSTAL FIBER AND MANUFACTURING METHOD THEREOF - The present invention relates to a double cladding crystal fiber and manufacturing method thereof, in which growing an YAG or a sapphire into a single crystal fiber by LHPG method, placing the single crystal fiber into a glass capillary for inner cladding, placing the single crystal fiber together with the glass capillary for inner cladding into a glass capillary for outer cladding in unison, heating the glass capillary for inner cladding and outer cladding by the LHPG method to attach to the outside of the single crystal fiber, and thus growing into a double cladding crystal fiber. When the present invention is applied to high power laser, by using the cladding pumping scheme, the high power pumping laser is coupled to the inner cladding layer, so the problems of heat dissipation and the efficiency impairment due to energy transfer up-conversion of high power laser are mitigated. | 03-20-2014 |
20140169748 | 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 microbend frontier (MBF) 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 | 06-19-2014 |
20140193128 | HOLEY FIBER AND METHOD OF PRODUCING THE SAME - A holey fiber includes: a core portion; an inner-cladding portion positioned at an outer periphery of the core portion, the inner-cladding portion having a plurality of inner holes formed in a layered structure around the core portion; and an outer-cladding portion positioned at an outer periphery of the inner-cladding portion, the outer-cladding portion having a plurality of outer holes formed in a layered structure around the inner-cladding portion. The inner holes are disposed to form a triangular lattice of which lattice constant Λ | 07-10-2014 |
20140212103 | DOUBLE-CLAD, GAIN-PRODUCING FIBERS WITH INCREASED CLADDING ABSORPTION WHILE MAINTAINING SINGLE-MODE OPERATION - The cladding absorption of single-mode, double-clad, gain-producing fibers is increased in fiber designs that includes a trench region disposed between the core and inner cladding regions. Increased cladding absorption is achieved while maintaining single-mode operation. | 07-31-2014 |
20140241686 | OPTICAL FIBER AND METHOD OF MANUFACTURING THE SAME - An optical fiber is provided. The optical fiber has a refractive index profile that includes a central core, an inner cladding layer, a trench layer, and an outer cladding layer. A trench layer is provided with a reduced refractive index. The optical fiber has a large effective area without having an increase of a cutoff wavelength, and exhibits low macrobending loss. | 08-28-2014 |
20140248026 | SINGLE MODE OPTICAL FIBER - A low attenuation single mode optical fiber includes a core layer and claddings. The core layer has the relative refractive index difference (RRID) Δ1 ranging from −0.1% to +0.1% and the radius R | 09-04-2014 |
20140376869 | OPTICAL FIBER INCLUDING A PLURALITY OF SUB-CORE AREAS - An optical fiber is provided. The optical fiber includes a core located at the center of the optical fiber and having a maximum refractive index in the optical fiber, and a cladding located at a circumference of the core and having a refractive index lower than that of the core. The core has a structure in which sub-core areas having the refractive index higher than those of adjacent sub-core areas and sub-core areas having the refractive index lower than those of adjacent sub-core areas are alternately repeated. | 12-25-2014 |
20150043879 | SYSTEM AND METHOD FOR COMPENSATING FOR AND USING MODE-PROFILE DISTORTIONS CAUSED BY BENDING OPTICAL FIBERS - An apparatus and method for compensating for mode-profile distortions caused by bending optical fibers having large mode areas. In various embodiments, the invention micro-structures the index of refraction in the core and surrounding areas of the inner cladding from the inner bend radius to the outer bend radius in a manner that compensates for the index changes that are otherwise induced in the index profile by the geometry and/or stresses to the fiber caused by the bending. Some embodiments of an apparatus and method include a fiber having a plurality of substantially parallel cores, the fiber including a straight section and a curved section; guiding signal light primarily in a second core in the straight section; guiding the signal light from the second core into a first core between the straight section and the curved section; and guiding the signal light primarily in the first core in the curved section. | 02-12-2015 |
20150098682 | OPTICAL FIBER PREFORM, METHOD FOR PRODUCING OPTICAL FIBER, AND OPTICAL FIBER - An easily producible optical fiber preform which is drawn to an optical fiber having a core containing a sufficient concentration of alkali metal is provided. An optical fiber preform | 04-09-2015 |
20150301276 | SINGLE-MODE OPTICAL FIBER WITH LARGE EFFECTIVE AREA - A single-mode fiber with a large effective area comprises a core layer and a cladding layer. The core layer is cladded with an intermediate cladding layer, and a depressed cladding layer is provided outside the intermediate cladding layer. The core layer comprises a first fiber sub core layer having a radius r | 10-22-2015 |
20150301277 | OPTICAL FIBER WITH LARGE EFFECTIVE AREA - An optical fiber with a large effective area includes a core layer and a cladding layer. The core layer comprises an inner core layer having a radius of 1-4 μm and a relative refractive index difference Δ | 10-22-2015 |
20150316713 | OPTICAL FIBER AND OPTICAL TRANSMISSION SYSTEM - An optical fiber includes a core and a cladding that surrounds the core. The optical fiber has a group index of 1.465 or less at a wavelength of 1550 nm and an absolute value of chromatic dispersion of 4 ps/nm/km or less at a wavelength of 1550 nm. A relative refractive index difference between the core and pure silica ranges from −0.1% to 0.1%. The core includes a first core disposed at the center of the optical fiber and a second core surrounding the first core. A relative refractive index difference between the first core and the cladding ranges from 0.6% to 0.9%. A relative refractive index difference between the second core and the cladding ranges from 0.02% to 0.12%. The ratio of the diameter of the second core to the diameter of the first core ranges from 2.0 to 6.0. | 11-05-2015 |
20150316714 | MULTI-CORE AMPLIFICATION OPTICAL FIBER - A multi-core amplification optical fiber includes: a plurality of core portions doped with a rare-earth element; an inner cladding portion positioned at a periphery of the plurality of core portions, having a refractive index lower than a refractive index of the plurality of core portions, in which a first hole is formed; and an outer cladding layer positioned at a periphery of the inner cladding portion, having a refractive index lower than the refractive index of the inner cladding portion. | 11-05-2015 |
20150378092 | MOATLESS BEND-OPTIMIZED MULTIMODE FIBER - An optical fiber including a multimode core having a radius, R | 12-31-2015 |
20150378093 | REFLECTION/ABSORPTION COATING FOR LASER SLABS - An optical waveguide for guiding electromagnetic waves. One example of an optical waveguide includes a waveguide substrate, at least one layer of low index optical coating formed on a surface of the waveguide substrate, and a thin layer of metal formed on a surface of the at least one layer of the low index optical coating, where the at least one layer of low index optical coating is disposed between the waveguide substrate and the thin layer of metal. The thin layer of metal can have a thickness in a range of about 5 nm to about 20 nm. In one example, the thin layer of metal is chromium. | 12-31-2015 |
20160011365 | HIGH CHLORINE CONTENT LOW ATTENUATION OPTICAL FIBER | 01-14-2016 |
20160109650 | OPTICAL FIBER FOR FIBER BRAGG GRATING - An optical fiber having a composition that is most suitable from the viewpoint of filter formation time and filter properties of slanted fiber grating (SFG) is provided. An optical fiber made of silica-based glass comprises a core region, which does not contain GeO | 04-21-2016 |
20160131832 | OPTICAL FIBER - The optical fiber includes a core, the first cladding, and second cladding. The core is made of silica based glass containing Cl. The first cladding and the second cladding are made of silica based glass containing fluorine. The refractive index of the first cladding is lower than that of the core. The refractive index of the second cladding is lower than that of the core and higher than that of the first cladding. The second cladding is divided into an outer region having a uniform refractive index and an inner region having a refractive index higher than that of the outer region. The difference ΔP between the maximum refractive index of the inner region and the refractive index of the outer region is 0.02% to 0.10% in terms of relative refractive index with respect to pure silica based glass. The radial thickness R of the inner region is 10 μm to 25 μm. | 05-12-2016 |
20160170137 | Low Loss Optical Fiber And Method Of Making The Same | 06-16-2016 |
20170235045 | LOW ATTENUATION FIBER WITH STRESS RELIEVING LAYER AND A METHOD OF MAKING SUCH | 08-17-2017 |