Of Waveguide Core Patents (Class 385/142)
  • Patent number: 10209437
    Abstract: An optical fiber with ultra-low attenuation and large effective-area includes a core layer and cladding layers. The cladding layers have an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary outer cladding layer. The core layer has a radius of 4.8-6.5 ?m, and a relative refractive index difference of ?0.06% to 0.10%. The inner cladding layer has a radius of 9-15 ?m, and a relative refractive index difference of about ?0.40% to ?0.15%. The trench cladding layer has a radius of about 12-17 ?m, and a relative refractive index difference of about ?0.8% to ?0.3%. The auxiliary outer cladding layer has a radius of about 37-50 ?m, and a relative refractive index difference of about ?0.6% to ?0.25%. The outer cladding layer is a pure silicon-dioxide glass layer.
    Type: Grant
    Filed: January 9, 2018
    Date of Patent: February 19, 2019
    Assignee: YANGTZE OPTICAL FIBRE AND CABLE JOINT STOCK LIMITED COMPANY
    Inventors: Lei Zhang, Jihong Zhu, Shengya Long, Jun Wu, Ruichun Wang
  • Patent number: 10175437
    Abstract: In at least some embodiments, a disclosed subsea cable includes one or more floodable optical fiber conduits each having at least one tight buffered optical fiber for transporting optical signals. Each tight buffered optical fiber may have a relatively limited length. The subsea cable may further include multiple strength members contra-helically wound around or together with the one or more floodable optical fiber conduits. There may also or alternatively be included at least one hermetically sealed optical fiber conduit having at least one protected optical fiber spliced to one of the tight buffered optical fibers. At least some implementations splice each of the tight buffered optical fibers to corresponding protected fibers for the long-haul communications. Flooding of the floodable conduits may be provided via connectors at the subsea cable ends, via breakout locations where sensors are attached, and/or via vents in the conduit wall.
    Type: Grant
    Filed: August 5, 2014
    Date of Patent: January 8, 2019
    Assignee: PGS Geophysical AS
    Inventors: Jeremy Crane Smith, Robert A. P. Fernihough
  • Patent number: 10020235
    Abstract: In various approaches room-temperature gamma detector longevity may be improved by selectively removing, or selectively incorporating, alternate halogen component(s) from select surfaces of the detector. According to one embodiment, a method of improving operational longevity of a thallium bromide (TlBr)-based detector includes: selectively treating one or more surfaces of the TlBr-based detector to produce a surface substantially comprising pure TlBr. Similar techniques may be employed to restore a degraded or failed detector. According to another embodiment, a method of forming a TlBr-based detector exhibiting improved operational longevity includes: selectively treating one or more surfaces of the TlBr-based detector to replace Br therein with one or more alternate halogen components while also substantially avoiding replacing some or all of the Br in other surfaces of the TlBr-based detector with the one or more alternate halogen components.
    Type: Grant
    Filed: November 1, 2016
    Date of Patent: July 10, 2018
    Assignee: Lawrence Livermore National Security, LLC
    Inventors: Lars Voss, Adam Conway, Robert T. Graff, Art Nelson, Rebecca J. Nikolic, Stephen A. Payne, Erik Lars Swanberg, Jr.
  • Patent number: 9742144
    Abstract: The present application is directed to a planar waveguide amplifier. The planar waveguide amplifier includes a substrate having an upper surface and a lower surface. The planar waveguide amplifier includes a core formed on an upper surface of the substrate. The core includes a channel configured to transmit light there through. The planar waveguide amplifier also includes an upper cladding layer formed above the core. The upper cladding layer includes a glass doped with rare earth material in an amount less than about 5% of the upper cladding layer. The application is also directed to a method of amplifying a signal.
    Type: Grant
    Filed: December 23, 2016
    Date of Patent: August 22, 2017
    Assignee: LGS INNOVATIONS LLC
    Inventor: Inuk Kang
  • Patent number: 9546886
    Abstract: A fiber optic sensor for use in environments containing darkening agents, e.g., hydrogen. The sensor includes a multicore fiber or a fiber optic cable containing a number of optical signal paths. Each path includes a sensing core segment and one or more transmission core segments. The sensing core segment is configured to (i) produce optical perturbation signals (e.g., Raman or Rayleigh) at one or more locations along the segment, the perturbation signals corresponding to environmental conditions (e.g., temperature) sensed by the segment at a corresponding location, and (ii) allow the perturbation signals to be detected by measurement equipment coupled to the sensor when light signals from a given source excite the path. The transmission core segments in a selected path subject the perturbation signals to little if any further attenuation relative to the attenuation induced in the sensing core segments in reaction to the darkening agents.
    Type: Grant
    Filed: May 6, 2015
    Date of Patent: January 17, 2017
    Assignee: OFS FITEL, LLC
    Inventor: Michael J Luvalle
  • Patent number: 9527765
    Abstract: There is provided a method for producing a low-loss alkali metal-doped silica core optical fiber having excellent hydrogen resistance. The method for producing the optical fiber according to the present invention includes a drawing step of drawing an optical fiber preform in a drawing furnace to produce a silica glass-based optical fiber including a core region containing an alkali metal with an average concentration of 0.5 atomic ppm or more and a cladding region that surrounds the core region and a heating step of heating the optical fiber in a heating furnace through which the optical fiber drawn from the drawing furnace passes.
    Type: Grant
    Filed: December 11, 2013
    Date of Patent: December 27, 2016
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Tetsuya Haruna, Masaaki Hirano, Yoshiaki Tamura, Tetsuya Nakanishi
  • Patent number: 9492815
    Abstract: Chalcogenide glass-ceramic having, for example, the following composition GeSe2—Sb2Se3—CuI, this glass-ceramic comprising at least one crystalline phase, characterised in that the crystallisation rate and the dimensions of the crystals in the crystalline phase are such that the crystals are substantially in contact with each other in such a way that this crystalline phase has an electrical conductivity greater than or equal to 10?4 s·cm?1 which increases under lighting due to the creation of charge carriers within the crystalline phase.
    Type: Grant
    Filed: June 19, 2013
    Date of Patent: November 15, 2016
    Assignees: Centre National de la Recherche Scientifique, Universite de Nantes, Universite de Rennes 1
    Inventors: Xianghua Zhang, Laurent Calvez, Hong Li Ma, Xianping Fan, Yang Xu, Alain Lafond
  • Patent number: 9444216
    Abstract: The present invention relates to a crystal fiber, and more particularly to a Ti: sapphire crystal fiber, a manufacturing method thereof, and a wide band light source with the same. The Ti: sapphire single crystal is grown by means of laser-heated pedestal growth (LHPG) method into a crystal fiber of a predetermined diameter. The as-grown crystal fiber is annealed for enhancing its fluorescence and reducing the infra-red residual absorption. The annealed crystal fiber is inserted into a glass capillary and is grown into a single-clad crystal fiber. The wide band light source comprises: a pumping source for providing a pumping light; a single-clad Ti: sapphire crystal fiber for absorbing the pumping light and emitting the wide band light.
    Type: Grant
    Filed: November 6, 2013
    Date of Patent: September 13, 2016
    Assignee: National Taiwan University
    Inventors: Kuang-Yu Hsu, Dong-Yo Jheng, Yi-Han Liao, Sheng-Lung Huang
  • Patent number: 9425575
    Abstract: Generating broadband light downhole for wellbore application. A laser source is configured to reside outside a wellbore and produce a seed light pulse at a first wavelength spectrum. A converter is configured to be received inside the wellbore, remote from the laser source. The converter receives the seed light pulse at the first wavelength spectrum through one or more fiber optic cables, and generates light at a second wavelength spectrum that has a broader range than the first wavelength spectrum.
    Type: Grant
    Filed: June 11, 2013
    Date of Patent: August 23, 2016
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Ian Bradford Mitchell, Mikko Jaaskelainen
  • Patent number: 9416043
    Abstract: An apparatus for manufacturing a glass perform, includes: a dummy tube section, a reservoir portion, and a cooling portion; and a glass tube section in which particles of an alkali metal compound or an alkaline earth metal compound which have flowed into the glass tube section from the dummy tube section are heated by a second heat source which performs traverse, and oxides of the particles being deposited on an inner wall and dispersed in the glass tube section. In the cooling portion of the dummy tube section, vapor of the alkali metal compound or the alkaline earth metal compound generated by heating of a first heat source is cooled and condensed by a dry gas flowing into the dummy tube section, and thereby the particles are generated.
    Type: Grant
    Filed: October 23, 2014
    Date of Patent: August 16, 2016
    Assignee: FUJIKURA LTD.
    Inventor: Takayuki Kitamura
  • Patent number: 9378880
    Abstract: Methods are disclosed for synthesizing nanocomposite materials including ferromagnetic nanoparticles with polymer shells formed by controlled surface polymerization. The polymer shells prevent the nanoparticles from forming agglomerates and preserve the size dispersion of the nanoparticles. The nanocomposite particles can be further networked in suitable polymer hosts to tune mechanical, optical, and thermal properties of the final composite polymer system. An exemplary method includes forming a polymer shell on a nanoparticle surface by adding molecules of at least one monomer and optionally of at least one tethering agent to the nanoparticles, and then exposing to electromagnetic radiation at a wavelength selected to induce bonding between the nanoparticle and the molecules, to form a polymer shell bonded to the particle and optionally to a polymer host matrix. The nanocomposite materials can be used in various magneto-optic applications.
    Type: Grant
    Filed: March 16, 2015
    Date of Patent: June 28, 2016
    Assignee: The Arizona Board of Regents on Behalf of the University of Arizona
    Inventors: Palash Gangopadhyay, Alejandra Lopez-Santiago, Robert A. Norwood
  • Patent number: 9343864
    Abstract: A planar optical waveguide amplifier includes an active optical waveguide (203) containing rare-earth ions embedded in a passive optical waveguide (202) that guides the pump power.
    Type: Grant
    Filed: February 9, 2012
    Date of Patent: May 17, 2016
    Assignee: Soreq Nuclear Research Center
    Inventor: Bruno Sfez
  • Patent number: 9335465
    Abstract: 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.
    Type: Grant
    Filed: January 15, 2013
    Date of Patent: May 10, 2016
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Masaaki Hirano, Tetsuya Haruna, Yoshiaki Tamura
  • Patent number: 9325140
    Abstract: Examples of the present invention include integrated erbium-doped waveguide lasers designed for silicon photonic systems. In some examples, these lasers include laser cavities defined by distributed Bragg reflectors (DBRs) formed in silicon nitride-based waveguides. These DBRs may include grating features defined by wafer-scale immersion lithography, with an upper layer of erbium-doped aluminum oxide deposited as the final step in the fabrication process. The resulting inverted ridge-waveguide yields high optical intensity overlap with the active medium for both the 980 nm pump (89%) and 1.5 ?m laser (87%) wavelengths with a pump-laser intensity overlap of over 93%. The output powers can be 5 mW or higher and show lasing at widely-spaced wavelengths within both the C- and L-bands of the erbium gain spectrum (1536, 1561 and 1596 nm).
    Type: Grant
    Filed: March 7, 2014
    Date of Patent: April 26, 2016
    Assignee: Massachusetts Institute of Technology
    Inventors: Purnawirman Purnawirman, Michael R. Watts, Ehsan Shah Hosseini, Jonathan D. B. Bradley, Jie Sun, Matteo Cherchi
  • Patent number: 9310471
    Abstract: A chip-scale scanning lidar includes a two dimensional (2D) scanning micromirror for a transmit beam and a 2D scanning micromirror for a receive beam, a laser diode and a photodetector, a first waveguide and first grating outcoupler coupled to a front facet of the laser diode, a second waveguide and a second grating outcoupler coupled to a rear facet of the laser diode on a substrate. A first fixed micromirror, a second micromirror, a third micromirror, and a focusing component are in a dielectric layer bonded to the substrate over the laser diode and photodetector. The photodetector is optically coupled to the second fixed micromirror and the third fixed micromirror for coherent detection.
    Type: Grant
    Filed: June 27, 2014
    Date of Patent: April 12, 2016
    Assignee: HRL Laboratories, LLC
    Inventors: Keyvan Sayyah, Pamela R. Patterson, Oleg M. Efimov
  • Patent number: 9266767
    Abstract: A method for manufacturing a primary preform including providing a hollow substrate tube, supplying to the interior of the tube a main gas flow containing at least one glass-forming gas and at least one secondary gas flow containing at least one precursor for a dopant, creating a plasma reaction zone in the interior of the tube to effect deposition, and interrupting the supply of the at least one secondary gas flow near the reversal points of the supply and discharge sides of the substrate tube.
    Type: Grant
    Filed: April 22, 2014
    Date of Patent: February 23, 2016
    Assignee: Draka Comteq B.V.
    Inventors: Igor Milicevic, Mattheus Jacobus Nicolaas Van Stralen, Johannes Antoon Hartsuiker
  • Patent number: 9250178
    Abstract: The present invention includes an exposure chamber configured to contain a passivating gas having a selected hydrogen concentration, the exposure chamber further configured to contain at least one NLO crystal for exposure to the passivating gas within the chamber, a passivating gas source fluidically connected to the exposure chamber, the passivating gas source configured to supply passivating gas to an interior portion of the exposure chamber, and a substrate configured to hold the NLO crystal within the chamber, the substrate further configured to maintain a temperature of the NLO crystal at or near a selected temperature, the selected temperature being below a melting temperature of the NLO crystal.
    Type: Grant
    Filed: June 5, 2012
    Date of Patent: February 2, 2016
    Assignee: KLA-Tencor Corporation
    Inventors: Yung-Ho Chuang, Vladimir Dribinski
  • Patent number: 9177796
    Abstract: The embodiments herein provides methods for forming a PVD silicon oxide or silicon rich oxide, or PVD SiN or silicon rich SiN, or SiC or silicon rich SiC, or combination of the preceding including a variation which includes controlled doping of hydrogen into the compounds heretofore referred to as SiOxNyCz:Hw, where w, x, y, and z can vary in concentration from 0% to 100%, is produced as a hardmask with optical properties that are substantially matched to the photo-resists at the exposure wavelength. Thus making the hardmask optically planarized with respect to the photo-resist. This allows for multiple sequences of litho and etches in the hardmask while the photo-resist maintains essentially no optical topography or reflectivity variations.
    Type: Grant
    Filed: May 2, 2014
    Date of Patent: November 3, 2015
    Assignee: APPLIED MATERIALS, INC.
    Inventors: Christopher Dennis Bencher, Daniel Lee Diehl, Huixiong Dai, Yong Cao, Tingjun Xu, Weimin Zeng, Peng Xie
  • Patent number: 9139466
    Abstract: An optical fiber preform includes a core portion, in which the core portion includes an alkali-metal-doped core glass portion doped with an alkali metal, the maximum concentration of oxygen molecules in the core portion is 30 mol ppb or more, and the average concentration of the alkali metal in the core portion is 5 atomic ppm or more. A method of manufacturing an optical fiber preform includes an alkali-metal-doping step of doping a pipe composed of silica-based glass with an alkali metal, an oxygen-molecule-doping step of doping the glass pipe with oxygen molecules, and a collapsing step of collapsing the glass pipe by heating the glass pipe, in which the optical fiber preform is manufactured.
    Type: Grant
    Filed: January 18, 2012
    Date of Patent: September 22, 2015
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Masaaki Hirano, Tetsuya Haruna, Yoshiaki Tamura
  • Patent number: 9097834
    Abstract: An optical fiber preform has a core portion having a first core portion including a central axis, a second core portion disposed around the first core portion, and a third core portion disposed around the second core portion. The first core portion contains 10 atomic ppm or more of an alkali metal and 10 to 600 atomic ppm of chlorine, the second core portion contains 10 atomic ppm or less of the alkali metal and 10 to 600 atomic ppm of chlorine, and the third core portion contains 10 atomic ppm or less of the alkali metal and 2,000 atomic ppm or more of chlorine. An optical fiber has a core region doped with an alkali metal and chlorine, wherein the minimum concentration of chlorine in the core region is 1,000 atomic ppm or more, and the average concentration of the alkali metal therein is 0.2 atomic ppm or more.
    Type: Grant
    Filed: April 9, 2012
    Date of Patent: August 4, 2015
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Masaaki Hirano, Tetsuya Haruna, Yoshiaki Tamura
  • Patent number: 9057816
    Abstract: The invention provides a resin-coated optical fiber, including at least: a glass optical fiber composed of a core and a clad for coating the core; a primary layer made of UV-curing resin in contact with the glass optical fiber; and a secondary layer made of the UV-curing resin disposed on an outer periphery of the primary layer, wherein the primary layer has a two-layer structure of an inner layer in contact with a surface of the clad, and an outer layer for coating the inner layer, wherein the UV-curing resin of the inner layer has a Young's modulus of 0.9 MPa or more and 3.0 MPa or less at room temperature in a film state based on JIS standard K7113, and the UV-curing resin of the outer layer has a Young's modulus of 0.1 MPa or more and 0.7 MPa or less at room temperature in a film state based on JIS standard K7113.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: June 16, 2015
    Assignee: HITACHI METALS, LTD.
    Inventors: Shinji Hinoshita, Tetsuya Sukegawa, Tomokazu Hiyama, Shigeto Kobayashi, Natsuki Kamiya, Bing Yao
  • Publication number: 20150139600
    Abstract: Provided is a method of producing a preform 10P for a coupled multi-core fiber including: an arranging process P1 for arranging a plurality of core glass bodies 11R and a clad glass body 12R in such a way that the plurality of core glass bodies 11R are surrounded by the clad glass body 12R; and a collapsing process P2 for collapsing a gap between the core glass bodies 11R and the clad glass body 12R, wherein the respective core glass bodies 11R have outer regions 16 having a predetermined thickness from the periphery surfaces and made of silica glass undoped with germanium, and the clad glass body 12R is made of silica glass having a refractive index lower than a refractive index of the outer regions of the core glass bodies 11R.
    Type: Application
    Filed: January 23, 2015
    Publication date: May 21, 2015
    Applicant: FUJIKURA LTD.
    Inventors: Shoji Tanigawa, Katsuhiro Takenaga
  • Patent number: 9036953
    Abstract: An electro-optical modulator with two electrodes as part of a transmission line of a first phase modulator and two electrodes as part of a transmission line of a second phase modulator included in two arms of a Mach-Zehnder-interferometer. An electrical controller applies a first electrical high-frequency-modulated voltage signals between the first and second electrodes and applies a second electrical high-frequency-modulated signals between the fourth and third electrodes. The electrical controller applies signals such that voltages applied to the first and fourth electrodes have substantially a same high-frequency content, and voltages applied to the second and third electrodes have substantially the same high-frequency content. In such configuration, a constant voltage offset is produced by either the voltages applied to the first and fourth electrodes or, the second and third electrodes. Thereby, cross-talk between electrodes, electrical losses, device size and fabrication costs may be reduced.
    Type: Grant
    Filed: March 4, 2013
    Date of Patent: May 19, 2015
    Assignee: RWTH AACHEN UNIVERSITY
    Inventors: Jeremy Witzens, Florian Merget
  • Patent number: 8995814
    Abstract: A light guide has a transmission of greater than 90 percent, a refractive index greater than 1.4, and less than 10 haze percent. The light guide also includes an organosiloxane block copolymer having a weight average molecular weight of at least 20,000 g/mole. The organosiloxane block copolymer includes 40 to 90 mole percent disiloxy units of the formula [R12SiO2/2] arranged in linear blocks each having an average of from 10 to 400 disiloxy units [R12SiO2/2] per linear block, 10 to 60 mole percent trisiloxy units of the formula [R2SiO3/2] arranged in non-linear blocks each having a weight average molecular weight of at least 500 g/mol, and 0.5 to 25 mole percent silanol groups [?SiOH]. R1 is independently a C1 to C30 hydrocarbyl and R2 is independently a C1 to C20 hydrocarbyl. Moreover, at least 30% of the non-linear blocks are crosslinked with another non-linear block and aggregated in nano-domains.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: March 31, 2015
    Assignee: Dow Corning Corporation
    Inventors: David J. Deshazer, Steven Swier
  • Patent number: 8995802
    Abstract: An IR supercontinuum source for generating supercontinuum in the MIR or possibly LWIR spectral bands comprises a supercontinuum fiber formed from a heavy metal oxide host glass having low optical loss and high non-linearity over the spectral band that is stable, strong and chemically durable. The supercontinuum fiber is suitably a depressed inner clad fiber configured to support only single transverse spatial mode propagation of the pump signal and supercontinuum. The source suitably includes a tapered depressed inner clad fiber to couple the pump signal into the supercontinuum fiber. The source may be configured as an “all-fiber” source.
    Type: Grant
    Filed: July 14, 2014
    Date of Patent: March 31, 2015
    Assignee: NP Photonics, Inc.
    Inventors: Arturo Chavez-Pirson, Daniel Larry Rhonehouse, Dan T. Nguyen
  • Patent number: 8977097
    Abstract: A planar waveguide with a glass core and a crystalline cladding. In a specific embodiment, the core is doped preferably with Neodymium, Ytterbium, or Erbium. In the best mode, the core is athermal glass with a refractive index uniformity 10?6 or better and the crystalline cladding has a refractive index lower than that of the core by 10?4 to 10?3 with a refractive index uniformity of 10?4. The cladding has high transparency at pump and lasing wavelengths. The coefficient of thermal expansion of the cladding is close to that of the core. In illustrative embodiments, the cladding is Sapphire and the core is aluminate glass. In an alternative embodiment, the cladding is crystal quartz and the core—is phosphate glass. By utilizing different materials for the core and cladding, the properties of each are optimized.
    Type: Grant
    Filed: February 17, 2010
    Date of Patent: March 10, 2015
    Assignee: Raytheon Company
    Inventor: Davis M. Filgas
  • Patent number: 8958664
    Abstract: A semiconductor optical modulator includes a substrate; and a mesa portion having a first cladding layer disposed on the substrate, a core layer disposed on the first cladding layer, and a second cladding layer disposed on the core layer, the first cladding layer having a first conductivity type, the second cladding layer having a second conductivity type reverse to the first conductivity type. The core layer includes a first multi quantum well structure made from a first conductivity type semiconductor layer and a second multi quantum well structure made from an i-type semiconductor layer in which no impurity is intentionally doped. The second multi quantum well structure is disposed on the first cladding layer. The first multi quantum well structure is disposed on the second multi quantum well structure. The second cladding layer is disposed on the first multi quantum well structure.
    Type: Grant
    Filed: February 25, 2013
    Date of Patent: February 17, 2015
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Naoya Kono
  • Patent number: 8934748
    Abstract: One embodiment of the invention includes a method for forming an optical fiber. The method comprises providing a preform having a core material and a glass cladding material surrounding the core material. The method also comprises drawing the preform at a temperature that is greater than a melting temperature of the core material to form a drawn fiber. The method further comprises cooling the drawn fiber to form the optical fiber having a crystalline fiber core and a cladding that surrounds the crystalline fiber core and extends axially along a length of the crystalline fiber core.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: January 13, 2015
    Assignee: Northrop Grumman Systems Corporation
    Inventors: Robert R. Rice, John Ballato, Hacop Injeyan, Hiroshi Komine, Michael G. Wickham
  • Patent number: 8923681
    Abstract: An optical fiber core having a primary layer and a secondary layer, which are laminated on a bare optical fiber. The primary layer is formed by curing an ultraviolet-curable resin composition containing a first silane coupling agent, which can be incorporated into a resin skeleton, and a second silane coupling agent, which cannot be incorporated into a resin skeleton. The first silane coupling agent contains a compound having a methoxy group, and the second silane coupling agent contains a compound having an ethoxy group.
    Type: Grant
    Filed: November 29, 2012
    Date of Patent: December 30, 2014
    Assignee: Fujikura Ltd.
    Inventors: Akira Namazue, Akira Murata, Mizuki Isaji
  • Patent number: 8891925
    Abstract: An optical fiber having both low macrobend loss and low microbend loss. The fiber has a first inner cladding region having an outer radius r2>8 microns and refractive index ?2 and a second outer cladding region surrounding the inner cladding region having refractive index ?4, wherein ?1>?4>?2. The difference between ?4 and ?2 is greater than 0.002 percent. The fiber exhibits a 22 m cable cutoff less than or equal to 1260 nm, and r1/r2 is greater or equal to 0.25.
    Type: Grant
    Filed: August 17, 2012
    Date of Patent: November 18, 2014
    Assignee: Corning Incorporated
    Inventors: Scott Robertson Bickham, Dana Craig Bookbinder, Jeffrey Coon, Ming-Jun Li, Snigdharaj Kumar Mishra, Pushkar Tandon, James Andrew West
  • Patent number: 8818160
    Abstract: An IR supercontinuum source for generating supercontinuum in the MIR or possibly LWIR spectral bands comprises a supercontinuum fiber formed from a heavy metal oxide host glass having low optical loss and high non-linearity over the spectral band that is stable, strong and chemically durable. The supercontinuum fiber is suitably a depressed inner clad fiber configured to support only single transverse spatial mode propagation of the pump signal and supercontinuum. The source suitably includes a tapered depressed inner clad fiber to couple the pump signal into the supercontinuum fiber. The source may be configured as an “all-fiber” source.
    Type: Grant
    Filed: May 6, 2013
    Date of Patent: August 26, 2014
    Assignee: NP Photonics, Inc.
    Inventors: Arturo Chavez-Pirson, Daniel Larry Rhonehouse, Dan T. Nguyen
  • Patent number: 8805133
    Abstract: A tellurium oxide glass that is stable, strong and chemically durable exhibits low optical loss from the UV band well into the MIR band. Unwanted absorption mechanisms in the MIR band are removed or reduced so that the glass formulation exhibits optical performance as close as possible to the theoretical limit of a tellurium oxide glass. The glass formulation only includes glass constituents that provide the intermediate, modifiers and any halides (for OH— reduction) whose inherent absorption wavelength is longer than that of Tellurium (IV) oxide. The glass formulation is substantially free of Sodium Oxide and any other passive glass constituent including hydroxyl whose inherent absorption wavelength is shorter than that of Tellurium (IV) oxide. The glass formulation preferably includes only a small residual amount of halide.
    Type: Grant
    Filed: January 18, 2013
    Date of Patent: August 12, 2014
    Assignee: NP Photonics, Inc.
    Inventors: Daniel Larry Rhonehouse, Arturo Chavez-Pirson
  • Patent number: 8798412
    Abstract: 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 (d2), wherein an outer dimension (d1) of the rod is less than or equal to 0.06 times the final outer dimension (d2). In a preferred embodiment, the alkali metal oxide-doped rod is inserted into the centerline hole of a preform to form an assembly.
    Type: Grant
    Filed: August 27, 2004
    Date of Patent: August 5, 2014
    Assignee: Corning Incorporated
    Inventors: Dana C. Bookbinder, Lisa C. Chacon, Adam J. G. Ellison, Rostislav R. Khrapko, Stephan L. Logunov, Michael T. Murtagh, Sabyasachi Sen
  • Publication number: 20140205258
    Abstract: A tellurium oxide glass that is stable, strong and chemically durable exhibits low optical loss from the UV band well into the MIR band. Unwanted absorption mechanisms in the MIR band are removed or reduced so that the glass formulation exhibits optical performance as close as possible to the theoretical limit of a tellurium oxide glass. The glass formulation only includes glass constituents that provide the intermediate, modifiers and any halides (for OH— reduction) whose inherent absorption wavelength is longer than that of Tellurium (IV) oxide. The glass formulation is substantially free of Sodium Oxide and any other passive glass constituent including hydroxyl whose inherent absorption wavelength is shorter than that of Tellurium (IV) oxide. The glass formulation preferably includes only a small residual amount of halide.
    Type: Application
    Filed: January 18, 2013
    Publication date: July 24, 2014
    Applicant: NP PHOTONICS, INC.
    Inventors: Daniel Larry Rhonehouse, Arturo Chavez-Pirson
  • Patent number: 8774590
    Abstract: Provided is an ytterbium-doped optical fiber including a core containing at least ytterbium, aluminum and phosphorous and a clad surrounding the core, wherein a molar concentration of diphosphorus pentoxide with respect to phosphorus in the core is equal to a molar concentration of aluminum oxide with respect to aluminum in the core, wherein a ratio of a molar concentration of diphosphorus pentoxide with respect to phosphorus in the core to the molar concentration of ytterbium oxide with respect to ytterbium in the core is higher than or equal to 10 and lower than or equal to 30, and wherein a relative refractive index difference between the core and the clad is higher than or equal to 0.05% and lower than or equal to 0.30%.
    Type: Grant
    Filed: April 29, 2011
    Date of Patent: July 8, 2014
    Assignee: Fujikura Ltd.
    Inventors: Kentaro Ichii, Shoji Tanigawa, Tomofumi Arai
  • Patent number: 8755642
    Abstract: Fiber-amplifier device the light-path of which is devoid of a free-space element. The system device an all-fiber-optic Faraday rotator and isolator. The device has a multicomponent glass optical fiber having a core having a first doping concentration of 55%-85% (wt./wt.) of a first rare-earth oxide and a the isolator includes at least three magnetic cells with throughout bores hosting an optical fiber, the same magnetic poles of two immediately neighboring cells facing each other. The first rare-earth oxide includes one or more of Pr2O3, Nd2O3, Pm2O3, Sm2O3, Eu2O3, Gd2O3, Tb2O3, Dy2O3, Ho2O3, Er2O3, Tm2O3, Yb2O3, La2O3, Ga2O3, Ce2O3, and Lu2O3.
    Type: Grant
    Filed: August 12, 2013
    Date of Patent: June 17, 2014
    Assignee: AdValue Photonics, Inc.
    Inventor: Shibin Jiang
  • Patent number: 8750655
    Abstract: An optical fiber may be constructed of a material having at least first and second constituents. The constituents and their relative abundance are selected such that the aggregate Brillouin frequency-shift response exhibited by a fiber constructed using the combined material is insensitive to a selected physical condition, such as temperature or strain, or the sensitivity is below an acceptable application-specific level, over an acceptable range of conditions. The constituents are selected such that the slopes or derivatives of the Brillouin frequency-shift response (with respect to the selected physical condition) of two of the constituents have opposite signs, and are combined in proper quantities such that the constituents balance each other to reduce the slope or derivative of the aggregate Brillouin frequency-shift response of the combined material to zero, or to an acceptable application-specific level, over an acceptable range of conditions.
    Type: Grant
    Filed: May 25, 2012
    Date of Patent: June 10, 2014
    Inventor: Peter Dragic
  • Patent number: 8750666
    Abstract: An optical device having a plasmonic waveguide, in which the plasmonic waveguide has a layered structure of at least three layers that a ferromagnetic metal layer, a first dielectric layer, and a second dielectric layer are layered in this order, in which the first and second dielectric layers are layers that allow light to be transmitted therethrough, and in which a refractive index of the second dielectric layer is higher than a refractive index of the first dielectric layer; and an optical isolator, having the optical device.
    Type: Grant
    Filed: January 22, 2013
    Date of Patent: June 10, 2014
    Assignee: National Institute of Advanced Industrial Science and Technology
    Inventors: Vadym Zayets, Koji Ando, Hidekazu Saito, Shinji Yuasa
  • Patent number: 8722842
    Abstract: The present invention provides an optical film exhibiting wavelength dispersion such that a retardation value is smaller on the shorter wavelength side, and capable of being also formed comparatively thinly. The optical film of the present invention is an optical film including a polyimide-based polymer represented by the following general formula (I). In the formula (I), m is 40% by mol or more and 100% by mol or less. R1 and R2 each independently denote a substituent having a carbon-carbon double bond or a triple bond. A, A?, B, B?, E, G, and H each denote a substituent, and small letters corresponding to these alphabets denote substitution number thereof. X and Y each independently denote bond part such as a covalent bond. The substituents having a carbon-carbon double bond or a triple bond represented by R1 and R2 are a substituted or unsubstituted aryl group, a substituted or unsubstituted vinyl group, and a substituted or unsubstituted ethynyl group.
    Type: Grant
    Filed: April 3, 2008
    Date of Patent: May 13, 2014
    Assignee: Nitto Denko Corporation
    Inventors: Toshiyuki Iida, Yutaka Ohmori, Miyuki Kurogi
  • Patent number: 8705923
    Abstract: Methods for designing improved multimode fiber optic cables are provided. In an embodiment, the method includes measuring a DMD waveform profile of a reference multimode fiber optic cable, where the reference multimode fiber optic cable has a reference refractive index profile. The method of this embodiment further includes designing an improved refractive index profile for the improved multimode fiber optic cable, where the improved refractive index profile comprises the reference refractive index profile modified by a quantity ?n(r), where r is a radius from the center of the core, where the quantity ?n(r) is negative over at least some radial window, and where the quantity ?n(r) follows a function such that the improved multimode fiber optic cable having the improved refractive index profile produces a DMD waveform profile having a shift to the left in radial pulse waveforms for increasing radii.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: April 22, 2014
    Assignee: Panduit Corp.
    Inventors: Gaston E. Tudury, Richard J. Pimpinella
  • Patent number: 8687936
    Abstract: 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%·?m2 and 18%·?m2. The jacket has a relative refractive index difference between 0.03% and 0.20%. Glass constituting the core has a fictive temperature between 1400° C. and 1560° C. Stress remaining in the core is compressive stress. A cutoff wavelength measured on a fiber having a length of 2 m is 1300 nm or more and a cutoff wavelength measured on a fiber having a length of 100 m is 1500 nm or less. An effective area at a wavelength of 1550 nm is 110 ?m2 or more. A attenuation at a wavelength of 1550 nm is 0.19 dB/km or less.
    Type: Grant
    Filed: December 6, 2012
    Date of Patent: April 1, 2014
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Tetsuya Nakanishi, Tatsuya Konishi, Kazuya Kuwahara
  • Patent number: 8660395
    Abstract: There is described an optical waveguide structure exhibiting nonlinear properties, a method of fabricating such, and an optical coupling device made of two of such optical waveguide structures. The optical waveguide structure comprises an optical waveguide portion made of a light transmitting material for supporting a light mode traveling therein. The light transmitting material has an intrinsic nonlinearity parameter suitable for inducing a nonlinearity on the light mode, and the optical waveguide portion having a diameter sized to securely confine the light mode therein and to increase the nonlinearity on the light mode. The optical waveguide structure also has a coating surrounding the optical waveguide portion to mechanically support or to protect the optical waveguide portion from surface damage.
    Type: Grant
    Filed: May 25, 2010
    Date of Patent: February 25, 2014
    Inventors: Martin Rochette, Chams Baker
  • Publication number: 20140037261
    Abstract: An optical fiber for an optical fiber sensor and a chemical sensor using the same are disclosed. The optical fiber includes a core area, and a suspended cladding area formed around the core area and having at least one cladding hole. The core area has at least one core hole for reducing an effective refractive index of the core area. The optical fiber and the chemical sensor using the same may have improved measurement sensitivity by increasing an evanescent field fraction of existing suspended core fibers.
    Type: Application
    Filed: July 24, 2013
    Publication date: February 6, 2014
    Applicant: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Bok Hyeon KIM, Youngjoo CHUNG, So Eun KIM, Bongkyun KIM, Tae Joong EOM, Myoung Kyu OH
  • Patent number: 8600210
    Abstract: A GI type optical fiber of the present invention is a GI type optical fiber having a core component and a cladding component disposed around the outer periphery of the core component, the core component includes a polymer containing at least 55 wt % chlorostyrene monomer and a dopant, and the cladding component includes a polymer of a monomer containing at least 35 wt % methyl methacrylate. It is an object of the present invention to provide a GI type optical fiber in which chlorostyrene is used as the predominant component of the monomer that constitutes the core component, and therefore has excellent transparency and good flexibility, and allows high-speed communication.
    Type: Grant
    Filed: February 4, 2010
    Date of Patent: December 3, 2013
    Assignees: Sekisui Chemical Co., Ltd., Keio University
    Inventors: Hirotsugu Yoshida, Tazuru Okamoto, Ryosuke Nakao, Hiroka Inabe, Yuki Masabe, Yasuhiro Koike
  • Publication number: 20130301115
    Abstract: Various embodiments described herein comprise a laser and/or an amplifier system including a doped gain fiber having ytterbium ions in a phosphosilicate glass. Various embodiments described herein increase pump absorption to at least about 1000 dB/m-9000 dB/m. The use of these gain fibers provide for increased peak-powers and/or pulse energies. The various embodiments of the doped gain fiber having ytterbium ions in a phosphosilicate glass exhibit reduced photo-darkening levels compared to photo-darkening levels obtainable with equivalent doping levels of an ytterbium doped silica fiber.
    Type: Application
    Filed: July 16, 2013
    Publication date: November 14, 2013
    Inventors: Liang Dong, Martin E. Fermann, Hugh McKay, Libin Fu, Shigeru Suzuki
  • Patent number: 8565567
    Abstract: The present invention relates to a multi-mode optical fiber having a structure which can be produced with good stability with a communication bandwidth broader than that in the conventional structures, and in which both GeO2 and chlorine are added to a core thereof, and chlorine is also added to a cladding thereof. The cladding contains chlorine such that the average chlorine concentration therein becomes higher than the average chlorine concentration in the core.
    Type: Grant
    Filed: November 23, 2011
    Date of Patent: October 22, 2013
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Sumio Hoshino, Kazuhiro Yonezawa
  • Patent number: 8565566
    Abstract: The present invention relates to a multi-mode optical fiber having a structure enabling stable production and broadening of communication bandwidth as compared with the conventional structures. The multi-mode optical fiber has a core with a diameter 2a that is doped with GeO2 and chlorine. The chlorine concentration profile in the core along the diametric direction of the multi-mode optical fiber has a shape such that the chlorine concentration at a second measurement position within a range at a distance of from 0.9 a to 1.0 a from the center of the core in the radial direction thereof is higher than the chlorine concentration at a first measurement position at a distance of a/2 from the center of the core in the radial direction thereof.
    Type: Grant
    Filed: October 5, 2011
    Date of Patent: October 22, 2013
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Sumio Hoshino, Kazuhiro Yonezawa
  • Patent number: 8509574
    Abstract: An all-fiber optic Faraday rotator and isolator is presented. The device has a multicomponent glass optical fiber having a core having a first doping concentration of 55%-85% (wt./wt.) of a first rare-earth oxide and a cladding having a section doping concentration of 55%-85% (wt./wt.) of a second rare-earth oxide, where the first rare-earth oxide and the second rare earth oxide are one or more of Pr2O3, Nd2O3, Pm2O3, Sm2O3, Eu2O3, Gd2O3, Tb2O3, Dy2O3, Ho2O3, Er2O3, Tm2O3, Yb2O3, La2O3, Ga2O3, Ce2O3, and Lu2O3, and where the refractive index of the cladding is lower than a refractive index of the core. The fiber optic device further includes multiple magnetic cells each formed to include a bore extending there through, where the fiber is disposed in the bore of one of the magnetic cells.
    Type: Grant
    Filed: December 7, 2012
    Date of Patent: August 13, 2013
    Assignee: AdValue Photonics, Inc.
    Inventors: Shibin Jiang, Jihong Geng, Zhuo Jiang, Tao Luo
  • Patent number: 8509588
    Abstract: An amplifying optical fiber includes a core containing oxides of elements selected from the group consisting of silicon, germanium, phosphorus, bismuth, aluminum, gallium with a concentration of bismuth oxide of 10-4-5 mol %, a total concentration of silicon and germanium oxides of 70-99.8999 mol %, a total concentration of aluminum and gallium oxides of 0.1-20 mol % wherein both aluminum and gallium oxide are present and a ratio of aluminum oxide to gallium oxide is at least two, and a concentration of phosphorus oxide from 0 to 10 mol %, and provides a maximum optical gain at least 10 times greater than the nonresonant loss factor in the optical fiber. An outside oxide glass cladding comprises fused silica. The core has an absorption band in the 1000 nm region, pumping to which region provides an increased efficiency of power conversion of pump light into luminescence light in the 1000-1700 nm range.
    Type: Grant
    Filed: September 8, 2006
    Date of Patent: August 13, 2013
    Assignee: Fiber Optics Research Center of The Russian Academy of Sciences
    Inventors: Evgeny Mikhailovich Dianov, Vladislav Vladimirovich Dvoirin, Valery Mikhailovich Mashinsky, Alexei Nikolaevich Guryanov, Andrei Alexandrovich Umnikov
  • Patent number: RE46098
    Abstract: An illumination system generating light having at least one wavelength within 200 nm a plurality of nano-sized structures (e.g., voids). The optical fiber coupled to the light source. The light diffusing optical fiber has a core and a cladding. The plurality of nano-sized structures is situated either within said core or at a core-cladding boundary. The optical fiber also includes an outer surface. The optical fiber is configured to scatter guided light via the nano-sized structures away from the core and through the outer surface, to form a light-source fiber portion having a length that emits substantially uniform radiation over its length, said fiber having a scattering-induced attenuation greater than 50 dB/km for the wavelength(s) within 200 nm to 2000 nm range.
    Type: Grant
    Filed: April 17, 2015
    Date of Patent: August 9, 2016
    Assignee: Corning Incorporated
    Inventors: Scott Robertson Bickham, Dana Craig Bookbinder, Edward John Fewkes, Stephan Lvovich Logunov