Utilizing Multiple Core Or Cladding Patents (Class 385/126)
  • Patent number: 10370557
    Abstract: A radiation curable secondary coating composition for optical fiber is described and claimed. This radiation curable secondary coating composition includes component (A) which is a urethane (meth)acrylate and component (B) which is a (meth)acrylate compound with two or more ethylenically unsaturated groups and one or more bisphenol structures; wherein the content of component (B) in the composition is 60-300 mass parts per 100 mass parts of component (A). The liquid secondary coating has a viscosity at 25° C. of from about 0.1 Pa·s to about 15 Pa·s. Films obtained by curing the liquid radiation curable secondary coating composition of the present invention have a Young's modulus of from about 600 MPa to about 500 MPa and the breaking elongation of the cured film is from about to 5% to about 50%.
    Type: Grant
    Filed: November 18, 2015
    Date of Patent: August 6, 2019
    Assignee: DSM IP Assets B.V.
    Inventors: Hirofumi Uchida, Zen Komiya
  • Patent number: 10365429
    Abstract: A multicore fiber that includes: three or more cores that transmit in single-mode transmission; a common clad that covers a periphery of the three or more cores; and a low-refractive index portion that has a refractive index lower than a refractive index of the clad. The multicore fiber further includes a region having the three or more cores arranged annularly on a cross-section perpendicular to a longitudinal direction. At least a portion of the low-refractive index portion is arranged inside a minimum inscribed circle of two adjacent cores within the region.
    Type: Grant
    Filed: July 6, 2016
    Date of Patent: July 30, 2019
    Assignees: FUJIKURA LTD., NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSTIY
    Inventors: Shota Saito, Katsuhiro Takenaga, Kunimasa Saitoh, Takeshi Fujisawa
  • Patent number: 10337956
    Abstract: A method of qualifying an effective bandwidth of a multimode optical fiber at a first wavelength ?1, using DMD data of the fiber measured a second wavelength ?2. Data representative of a Radial Offset Delay, a Radial Offset Bandwidth and a Relative Radial Coupled Power of the fiber are derived from the DMD data at the second wavelength ?2. A transformation is performed on the ROD data and ROB data at the second wavelength ?2 to obtain corresponding ROD data and ROB data at the first wavelength ?1. An effective bandwidth of the fiber at the second wavelength ?2 is computed using the ROD data and the ROB data at the first wavelength ?1 and the {tilde over (P)}DMD data at the second wavelength ?2.
    Type: Grant
    Filed: December 17, 2015
    Date of Patent: July 2, 2019
    Assignee: DRAKA COMTEQ B.V.
    Inventors: Denis Molin, Koen De Jongh, Marianne Bigot, Pierre Sillard
  • Patent number: 10324255
    Abstract: The present disclosure provides an optical waveguide formation photosensitive epoxy resin composition which contains an epoxy resin and a photo-cationic polymerization initiator, wherein the epoxy resin includes a solid epoxy resin component alone. Thus, a core layer forming material can be provided, which has higher R-to-R (roll-to-roll) adaptability and higher transparency at a wavelength of 850 nm. Therefore, a core layer for an optical waveguide can be formed as having excellent R-to-R adaptability, higher transparency and a lower loss by using the optical waveguide formation photosensitive epoxy resin composition without changing the conventional production process.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: June 18, 2019
    Assignee: NITTO DENKO CORPORATION
    Inventor: Tomoyuki Hirayama
  • Patent number: 10295737
    Abstract: The present invention relates to the field of single-mode optical fibers and discloses a bending-insensitive, radiation-resistant single-mode optical fiber, sequentially including from inside to outside: a core, inner claddings, and an outer cladding, all made from a quartz material. The inner claddings comprise, from inside to outside, a first fluorine-doped inner cladding and a second fluorine-doped inner cladding. The core and the first fluorine-doped inner cladding are not doped with germanium. The respective concentrations of other metal impurities and phosphorus are less than 0.1 ppm. By mass percent, the core has a fluorine dopant content of 0-0.45% and a chlorine content of 0.01-0.10%; the first fluorine-doped inner cladding has a fluorine concentration of 1.00-1.55%; and the second fluorine-doped inner cladding has a fluorine concentration of 3.03-5.00%.
    Type: Grant
    Filed: October 21, 2016
    Date of Patent: May 21, 2019
    Assignee: FIBERHOME TELECOMMUNICATION TECHNOLOGIES CO., LTD
    Inventors: Qi Mo, Lijie Huang, Huang Yu, Cheng Liu, Wen Chen, Zhiqiang Yu, Dongxiang Wang, Bingfeng Cai, Liming Chen, Huiping Shi
  • Patent number: 10281389
    Abstract: A measuring cell includes a cavity for receiving a test sample to be used in a particle detection apparatus. The measuring cell is configured as an optical waveguide for guiding a light beam. The waveguide has a core which has a refractive index nK, extends along a longitudinal axis of the waveguide, has a cross-sectional area AK of less than 80 ?m2 in a cross section perpendicular to the longitudinal axis, and which is surrounded by a cladding having a smaller refractive index than nK. The cavity forms a channel. The channel extends along the longitudinal axis, is formed inside of or in contact with the core, and has at least one open end with an opening area AH of less than 0.2 ?m2.
    Type: Grant
    Filed: September 8, 2015
    Date of Patent: May 7, 2019
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Stefan Weidlich, Clemens Schmitt, Jörg Werner, Markus Schmidt, Jens Kobelke
  • Patent number: 10253139
    Abstract: One of the purposes of the present invention is to provide an addition-curable silicone composition which provides a cured product having good performance at a low temperature and excellent resistance to a temperature change, and to provide a semiconductor device having a high reliability, whose semiconductor element is encapsulated with a product obtained by curing the addition-curable silicone composition. Thus, an addition-curable silicone resin composition comprising (A) a branched organopolysiloxane represented by the following formula (1): wherein a is an integer of from 2 to 100, b is an integer of from 5 to 100, c is an integer of from 5 to 100, 0.03?a/(a+b)<1.
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: April 9, 2019
    Assignee: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Hiroyuki Iguchi, Takayuki Kusunoki
  • Patent number: 10139560
    Abstract: An anti-resonant hollow-core fiber comprising a first tubular, cladding element which defines an internal cladding surface, a plurality of second tubular elements which are attached to the cladding surface and together define a core with an effective radius, the second tubular elements being arranged in spaced relation and adjacent ones of the second tubular elements having a spacing therebetween, and a plurality of third tubular elements, each nested within a respective one of the second tubular elements.
    Type: Grant
    Filed: June 8, 2015
    Date of Patent: November 27, 2018
    Assignee: University of Southampton
    Inventors: Francesco Poletti, Seyedmohammad Abokhamis Mousavi
  • Patent number: 10122461
    Abstract: The invention relates to a mode selection method for a system for MIMO transmission on an optical fiber of multimode type. It comprises a step of measuring the transfer matrix of the transmission channel made up of a set of modes of the optical fiber (110), a step of transforming (120) the transfer matrix into a block diagonal matrix, each block being associated with a mode subset, a step of determining (130) the gain and/or the transmission capacity for each of the mode subsets, and a selection (140) of the mode subset corresponding to the highest gain and/or capacity, the MIMO transmission system then using only the modes of the subset thus selected to transmit on the optical fiber. The invention relates also to a core selection method for a system for MIMO transmission on optical fiber of multicore type.
    Type: Grant
    Filed: September 4, 2015
    Date of Patent: November 6, 2018
    Assignee: INSTITUT MINES-TELECOM
    Inventors: Elie Awwad, Ghaya Rekaya-Ben Othman, Yves Jaouen
  • Patent number: 10094972
    Abstract: A multicore fiber includes: a center core that propagates four LP mode light beams including an LP02 mode light beam; and a first to a fifth cores disposed on a first line to a fifth line segments extend from the center of the center core in the radial direction at predetermined angles. The multicore fiber includes a different mode interaction section in which the propagation constants of each mode light beam propagated through the center core are matched with the propagation constants of LP01 mode light beams propagated through the first to fifth cores.
    Type: Grant
    Filed: February 3, 2017
    Date of Patent: October 9, 2018
    Assignees: FUJIKURA LTD., NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY
    Inventors: Yusuke Sasaki, Hitoshi Uemura, Kunimasa Saitoh, Takeshi Fujisawa
  • Patent number: 10082383
    Abstract: A method and equipment for dimensional measurement of a micro part based on fiber laser with multi-core fiber Bragg grating probe are provided, wherein a multi-core FBG probe with FBGs (12,29) inscribed in the core or cores out of the center of the multi-core fiber is used to transform the two-dimensional or three-dimensional contact displacement into the spectrum shifts with a high sensitivity. At the meantime, the FBGs in the multi-core FBG probe (12,29) work as the wavelength selection device of the fiber laser, the wavelength of the fiber laser will change thereby. So the contact displacement is finally converted into the wavelength change of the fiber laser. The method and equipment have the advantage of high sensitivity, low probing force, compact structure, high inspecting aspect ratio and immunity to environment interference.
    Type: Grant
    Filed: March 4, 2016
    Date of Patent: September 25, 2018
    Assignee: HARBIN INSTITUTE OF TECHNOLOGY
    Inventors: Jiwen Cui, Shiyuan Zhao, Kunpeng Feng, Hong Dang, Junying Li, Jiubin Tan
  • Patent number: 10073217
    Abstract: A multicore optical fiber (1) includes a plurality of cores (11 to 16) and a cladding (20) surrounding the outer circumferential surfaces of the cores (11 to 16). In the plurality of cores of the multicore optical fiber (1), a skew value (S) between a pair of cores is expressed by a predetermined expression. The multicore optical fiber (1) is bent in a specific bending direction, in which in all of the combinations of the pairs of cores in the plurality of cores, the pair of cores has the maximum absolute value of the skew value found by the expression and the skew value of the pair of cores is a minimum value.
    Type: Grant
    Filed: January 29, 2016
    Date of Patent: September 11, 2018
    Assignee: FUJIKURA LTD.
    Inventors: Itaru Ishida, Shoichiro Matsuo
  • Patent number: 10031284
    Abstract: An MCF of the present embodiment has eight or more cores. A diameter of a common cladding is not more than 126 ?m. Optical characteristics of each core are as follows: a TL at a predetermined wavelength of 1310 nm is not more than 0.4 dB/km; an MFD at the predetermined wavelength is from 8.0 ?m to 10.1 ?m; a BL in a BR of not less than 5 mm or in the BR of not less than 3 mm and, less than 5 mm is not more than 0.25 dB/turn at the predetermined wavelength; ?0 is from 1300 nm to 1324 nm; ?cc is not more than 1260 nm; an XT or XTs at the predetermined wavelength is not more than 0.001/km.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: July 24, 2018
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Tetsuya Hayashi, Osamu Shimakawa
  • Patent number: 10007055
    Abstract: The invention relates to an optical link comprising N optical fibers, with N?2. Each optical fiber comprises an optical core and an optical cladding surrounding the optical core, the optical core having a single ?i graded-index profile with ?i?1, and the optical core having a radius R1i, where i E [1; N] is an index designating said optical fiber. Said optical cladding comprises a region of depressed refractive index ntrenchi, called a trench, surrounding the optical core. According to embodiments of the invention, for all optical fibers in said link, said optical core radius R1i and said length Li are chosen such that R1i?13.5 ?m and so as to satisfy a criterion C of quality. Thus, the invention provides a few-mode optical fiber link, which allow guiding an increased number of LP modes as compared to prior art FMF links, while reaching low Differential Mode Group Delay.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: June 26, 2018
    Assignee: Draka Comteq B.V.
    Inventors: Pierre Sillard, Denis Molin, Marianne Bigot-Astruc
  • Patent number: 9979061
    Abstract: A device is provided that includes a first waveguide configured to guide propagation of RF waves inside the first waveguide. A first side of the first waveguide is configured to emit an evanescent field associated with the propagation of the RF waves inside the first waveguide. The device also includes a second waveguide having a second side positioned within a predetermined distance to the first side of the first waveguide. The second waveguide is configured to guide propagation, inside the second waveguide, of induced RF waves associated with the evanescent field from the first waveguide. The device also includes a first probe coupled to the first waveguide and configured to emit the RF waves for propagation inside the first waveguide. The device also includes a second probe coupled to the second waveguide and configured to receive induced RF waves propagating inside the second waveguide.
    Type: Grant
    Filed: October 27, 2015
    Date of Patent: May 22, 2018
    Assignee: Waymo LLC
    Inventors: Pierre-yves Droz, Adam Brown, Daniel L. Rosenband, Samuel William Lenius
  • Patent number: 9964697
    Abstract: An optical fiber includes: a core; and a clad which is formed so as to surround an outer circumference of the core concentrically with the core, the clad having at least an inner cladding layer adjacent to the outer circumference of the core and an outer cladding layer formed on an outer circumference of the inner cladding layer, wherein a refractive index of the outer cladding layer is ?3, and an outer circumference radius of the outer cladding layer is r3, a relationship of ?1max>?3>?2min is satisfied, a relationship of ?3??2min?0.08% is satisfied, a relationship of r1<r2<r3 is satisfied, a relationship of 0.35?r1/r2?0.55 is satisfied, a cable cut-off wavelength is less than or equal to 1260 nm, and an MFD at a wavelength of 1310 nm is 8.6 ?m to 9.2 ?m.
    Type: Grant
    Filed: May 24, 2016
    Date of Patent: May 8, 2018
    Assignee: FUJIKURA LTD.
    Inventors: Ryo Maruyama, Shoichiro Matsuo, Shunichirou Hirafune
  • Patent number: 9964699
    Abstract: Disclosed herein are systems and methods related to use of hollow core photonic crystal fibers. A system includes a tube and a collimating lens configured in a first end of the tube, wherein a single mode fiber is coupled to a first end of the collimating lens. A second lens is supported by a structure at a second end of the tube, the second lens receiving a first signal from a second end of the collimating lens and outputting a second signal that is coupled into a first end of a hollow core photonic crystal fiber. A first gas tube is configured to introduce gas through the structure into a chamber and a sealant seals at least one of the collimating lens and the structure within the tube. An output signal is received at a detector that catches the entire beam to suppress multiple-mode beating noise.
    Type: Grant
    Filed: September 21, 2015
    Date of Patent: May 8, 2018
    Assignee: The United States of America, as represented by the Administrator of the National Aeronautics and Space Administraion
    Inventors: Jeffrey R. Chen, Kenji Numata, Stewart T. Wu
  • Patent number: 9897751
    Abstract: A multicore polarization-maintaining fiber 10 includes a plurality of cores 11, a cladding 12 surrounding the plurality of cores 11, and a plurality of stress applying parts 15 provided sandwiching the plurality of cores 11 in a region surrounded by the outer circumferential surface of the cladding 12. The cross sectional area of the stress applying part 15 is greater than the cross sectional area of the core 11. Stress applying parts 15 of the plurality of stress applying parts 15 are disposed in a first direction, and stress applying parts 15 of the plurality of stress applying parts 15 are disposed in a second direction different from the first direction.
    Type: Grant
    Filed: May 12, 2016
    Date of Patent: February 20, 2018
    Assignee: FUJIKURA LTD.
    Inventors: Kazuyuki Hayashi, Katsuaki Izoe, Kazuhiko Aikawa
  • Patent number: 9891377
    Abstract: A multicore fiber including two or more cores each capable of single mode transmission, a cladding covering around the two or more cores in common, and a low refractive index portion having a refractive index lower than a refractive index of the cladding, wherein a cross-section perpendicular to a longitudinal direction includes a region where two or more cores of a part or all of the two or more cores are arranged in a circular shape and at least a part of the low refractive index portion is arranged inside an inscribed circle of the cores included in the region.
    Type: Grant
    Filed: February 8, 2016
    Date of Patent: February 13, 2018
    Assignees: FUJIKURA LTD., NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY
    Inventors: Shota Saito, Katsuhiro Takenaga, Kunimasa Saitoh, Takeshi Fujisawa
  • Patent number: 9857481
    Abstract: An apparatus for reading out X-ray information stored in a storage phosphor layer includes a light source for generating stimulating light which can stimulate the storage phosphor layer to emit stimulated emission, an optical fiber, in particular a single mode fiber, which is optically coupled to the light source and generates a stimulating light beam from the stimulating light, and a deflection element for deflecting the stimulating light beam to move over the storage phosphor layer.
    Type: Grant
    Filed: April 8, 2015
    Date of Patent: January 2, 2018
    Assignee: AFGA HEALTHCARE NV
    Inventors: Georg Reiser, Stephan Mair, Bernhard Stadtmueller
  • Patent number: 9857546
    Abstract: An optical module for connecting a photoelectric conversion device on a substrate to a ferrule connected to an optical fiber includes a body configured to be mounted on the substrate, a first lens disposed on the body at a side thereof connectable to the ferrule, a second lens disposed on the body at a side thereof facing the substrate, and a core disposed in the body between the first lens and the second lens, wherein a refractive index of the core is higher than a refractive index of the body.
    Type: Grant
    Filed: May 26, 2016
    Date of Patent: January 2, 2018
    Assignee: FUJITSU COMPONENT LIMITED
    Inventors: Hongfei Zhang, Shigemi Kurashima, Satoshi Moriyama, Shinichiro Akieda, Rie Gappa, Mitsuki Kanda
  • Patent number: 9846275
    Abstract: A quasi-single-mode optical fiber with a large effective area is disclosed. The quasi-single-mode fiber has a core with a radius greater than 5 ?m, and a cladding section configured to support a fundamental mode and a higher-order mode. The fundamental mode has an effective area greater than 170 ?m2 and an attenuation of no greater than 0.17 dB/km at a wavelength of 1530 nm. The higher-order mode has an attenuation of at least 1.0 dB/km at the wavelength of 1530 nm. The quasi-single-mode optical fiber has a bending loss of less than 0.02 dB/turn for a bend diameter of 60 mm for a wavelength of 1625 nm.
    Type: Grant
    Filed: September 23, 2015
    Date of Patent: December 19, 2017
    Assignee: Corning Incorporated
    Inventors: Ming-Jun Li, Snigdharaj Kumar Mishra, Michal Mlejnek, William Allen Wood, Aramais Robert Zakharian
  • Patent number: 9841555
    Abstract: Optical transmission systems and methods are disclosed that utilize a QSM optical fiber with a large effective area and that supports only two modes, namely the fundamental mode and one higher-order mode. The optical transmission system includes a transmitter and a receiver optically coupled by an optical fiber link that includes at least one section of the QSM optical fiber. Transmission over optical fiber link gives rise to MPI, which is mitigated using a digital signal processor. The QSM optical fiber is designed to have an amount of DMA that allows for the digital signal processor to have reduced complexity as reflected by a reduced number of filter taps as compared to if the DMA were zero.
    Type: Grant
    Filed: September 23, 2015
    Date of Patent: December 12, 2017
    Assignee: Corning Incorporated
    Inventors: John David Downie, Ming-Jun Li, Michal Mlejnek, Ioannis Georgios Roudas, William Allen Wood, Aramais Robert Zakharian
  • Patent number: 9841556
    Abstract: A multicore fiber is provided. The multicore fiber includes a plurality of cores spaced apart from one another, and a cladding surrounding the plurality of cores and defining a substantially rectangular or cross-sectional shape having four corners. Each corner has a radius of curvature of less than 1000 microns. The multicore fiber may be drawn from a preform in a circular draw furnace in which a ratio of a maximum cross-sectional dimension of the preform to an inside diameter of the preform to an inside diameter of the draw furnace is greater than 0.60. The multicore fiber may have maxima reference surface.
    Type: Grant
    Filed: April 25, 2016
    Date of Patent: December 12, 2017
    Assignee: Corning Incorporated
    Inventors: Douglas Llewellyn Butler, Daniel Warren Hawtof, Rick Charles Layton, III, Gautam Meda, John Stone, III, Pushkar Tandon
  • Patent number: 9753217
    Abstract: Electro-optical circuit boards may include one or more recesses to provide stress relief between multiple layers of the electro-optical circuit boards during variations in applied temperature. The one or more recesses may be included in the substrate and/or the optical layer of the electro-optical circuit boards. The one or more recesses may also contain a compliant material disposed therein to improve the flexibility of the substrate and/or the optical layer. For example, the compliant material may disperse thermal expansion stress within the electro-optical circuit board.
    Type: Grant
    Filed: October 29, 2015
    Date of Patent: September 5, 2017
    Assignee: XYRATEX TECHNOLOGY LIMITED
    Inventor: Richard C. A. Pitwon
  • Patent number: 9739935
    Abstract: An optical fiber includes a core, and a clad surrounding an outer circumference of the core, in which a first relative refractive index difference ?1a is greater than 0, a second relative refractive index difference ?1b is greater than 0, the first relative refractive index difference ?1a is greater than the second relative refractive index difference ?1b, the first relative refractive index difference ?1a and the second relative refractive index difference ?1b satisfy a relationship denoted by the following expression: 0.20?(?1a??1b)/?1a?0.88, and a refractive index profile ? of the core in an entire region of a section of 0?r?r1 as a function ?(r) of a distance r from a center of the core in the radial direction is denoted by the following expression: ?(r)=?1a?(?1a??1b)r/r1.
    Type: Grant
    Filed: March 29, 2016
    Date of Patent: August 22, 2017
    Assignee: FUJIKURA LTD.
    Inventors: Tatsuya Kishi, Sho Endo, Takayuki Kitamura
  • Patent number: 9726816
    Abstract: An MCF of the present embodiment has eight or more cores. A diameter of a common cladding is not more than 126 ?m. Optical characteristics of each core are as follows: a TL at a predetermined wavelength of 1310 nm is not more than 0.4 dB/km; an MFD at the predetermined wavelength is from 8.0 ?m to 10.1 ?m; a BL in a BR of not less than 5 mm or in the BR of not less than 3 mm and, less than 5 mm is not more than 0.25 dB/turn at the predetermined wavelength; ?0 is from 1300 nm to 1324 nm; ?cc is not more than 1260 nm; an XT or XTs at the predetermined wavelength is not more than 0.001/km.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: August 8, 2017
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Tetsuya Hayashi, Osamu Shimakawa
  • Patent number: 9720264
    Abstract: The invention relates to a method for producing a polarization-maintaining optical fiber, consisting of a core region and stress-generating elements embedded in the fiber body, having the following method steps: producing a core preform for the core region using internal deposition on a substrate tube, the internally coated substrate tube subsequently being collapsed, generating recesses on the core preform by virtue of the material on the outer surface of the core preform being removed parallel to the longitudinal axis of the core preform at diametrically opposed positions, filling the recesses with stress-generating rods, with the tightest possible rod packing, in a freely selectable first filling geometry, possibly filling the recesses in addition with non-stress-generating rods in a second filling geometry, sheathing the filled core preform with a jacketing tube, preparing the sheathed core preform for a fiber-drawing process, and drawing the sheathed arrangement to form the optical fiber.
    Type: Grant
    Filed: May 6, 2015
    Date of Patent: August 1, 2017
    Assignee: J-FIBER GMBH
    Inventors: Thomas Gutsche, Wolfgang Hämmerle, Robert Hanf, Lothar Brehm
  • Patent number: 9690053
    Abstract: Structures and techniques are described relating to the alignment of multicore fibers within a multifiber connector. These structures and techniques include: multicore fibers having a number of different shapes, including, for example, circular, elliptical, D-shaped, double D-shaped, and polygonal; multifiber ferrules, having a plurality of fiber guide holes therein of various shapes; alignment fixtures for aligning multicore fibers within multifiber ferrules; and various multicore fiber alignment techniques.
    Type: Grant
    Filed: May 15, 2015
    Date of Patent: June 27, 2017
    Assignee: OFS FITEL, LLC
    Inventors: Kelvin B. Bradley, Jinkee Kim, Gregory A. Sandels
  • Patent number: 9651735
    Abstract: Some implementations described herein involve defining a viewing angle range, also referred to herein as a viewing cone. The viewing cone may be produced by an array of optical fibers on a display. The optical fiber array may include tapered optical fibers that are capable of increasing the amount of light transmitted through the optical fiber array. The optical fiber array may be a graded index optical fiber array, wherein the refractive index of the optical fiber cores varies along the axis of the optical fibers.
    Type: Grant
    Filed: October 17, 2013
    Date of Patent: May 16, 2017
    Assignee: SnapTrack, Inc.
    Inventors: John H. Hong, Jian J. Ma, Bing Wen, Tallis Y. Chang
  • Patent number: 9632245
    Abstract: A bend-insensitive multimode optical fiber includes a core layer, and cladding layers surrounding the core layer. The core layer has a parabolic refractive index profile with ? being 1.9-2.2, a radius being 23-27 ?m, and a maximum relative refractive index difference being between 0.9-1.2%. The inner cladding layer has a width being 1-3 ?m and a relative refractive index difference being between ?0.05% and 0.1%. The trench cladding layer has a width being 2-5 ?m and a relative refractive index difference being between ?1% and ?0.3%. The core layer is a Ge/F co-doped silica glass layer, where an F doping contribution at a central position of the core layer is less than or equal to 0%, an F doping contribution at an edge portion of the core layer is greater than or equal to ?0.45%. The outer cladding layer is a pure silica glass layer.
    Type: Grant
    Filed: November 3, 2015
    Date of Patent: April 25, 2017
    Assignee: YANGTZE OPTICAL FIBRE AND CABLE JOINT STOCK LIMITED COMPANY
    Inventors: Runhan Wang, Dewu Li, Rong Huang, Gang Chen, Gaoqing Lei, Ruichun Wang, Shengya Long
  • Patent number: 9575245
    Abstract: An optical fiber containing an alkali metal and capable of reducing Rayleigh scattering loss is provided. An optical fiber has a core and a cladding made of silica glass and enclosing the core. The cladding contains fluorine and has a refractive index lower than the refractive index of the core. The core contains first group dopants selected from the group of Na element, K element, or a compound thereof at an average concentration of 0.2 ppm or more and 10 ppm or less. The core also contains second group dopants for reducing the viscosity of silica glass and having a diffusion coefficient of 1×10?12 cm2/s or more and smaller than the diffusion coefficient of the first group dopants, by an average concentration of 0.2 ppm or more at a temperature of 2000° C. to 2300° C.
    Type: Grant
    Filed: November 17, 2015
    Date of Patent: February 21, 2017
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Yoshiaki Tamura, Tetsuya Haruna, Yoshihiro Saito, Yuki Kawaguchi, Masaaki Hirano
  • Patent number: 9568684
    Abstract: A multicore fiber alignment apparatus is described, having a chassis into which is mounted ferrule-holding means for holding a multicore fiber ferrule having one or more capillaries extending therethrough. Fiber-holding means for holding one or more multicore fibers in position to be mounted into the ferrule, such that each multicore fiber extends through a respective ferrule capillary. Means are provided for monitoring the rotation angle of each multicore fiber within its respective capillary, relative to a reference rotational orientation. Means are further provided for rotating each of the multicore fibers within its respective capillary. The rotational orientation of each multicore fiber is fixed when its rotation angle is equal to zero.
    Type: Grant
    Filed: May 20, 2016
    Date of Patent: February 14, 2017
    Assignee: OFS Fitel, LLC
    Inventors: Kelvin B Bradley, Wladyslaw Czosnowski, Tristan Kremp, Yue Liang
  • Patent number: 9558770
    Abstract: A dual-slot waveguide receives energy from a coupling waveguide. The dual-slot waveguide includes first and second light propagating regions of low-index material located side-by-side in a direction normal to a light propagation direction. Inner sides of the first and second light propagating regions are separated by a first region of a high-index material. Second and third regions of the high-index material surround outer sides of the first and second light propagating regions. A near-field transducer receives portions of the energy from the first and second light propagating regions.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: January 31, 2017
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Ruoxi Yang, Mark Anthony Gubbins, Aidan Goggin, Michael J. Hardy, Roberto Fernandez Garcia, Choon How Gan
  • Patent number: 9541707
    Abstract: A multicore fiber 1 includes a plurality of cores 3 disposed at predetermined intervals and surrounded by a cladding 5. The multicore fiber 1 also includes a marker 7 formed apart from the cores 3. The refractive index of the marker 7 is different from those of the cores 3 and the cladding 5. For example, the marker 7 may be made of a material having lower refractive index than that of the cladding 5. In this case, for example, the cores 3 may be made of germanium-doped quartz. The cladding 5 may be made of pure quartz. The marker 7 may be made of fluorine-doped quartz. Further, the marker 7 may be an empty hole.
    Type: Grant
    Filed: August 31, 2014
    Date of Patent: January 10, 2017
    Assignee: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Tsunetoshi Saito, Katsunori Imamura, Kengo Watanabe
  • Patent number: 9535212
    Abstract: An optical fiber having a large mode area for high power applications and geometrically configured for single-mode operation. One example of an optical fiber system includes a mandrill and an optical fiber helically coiled about the mandrill with a preselected bend radius. The optical fiber includes a core having a high aspect ratio elongated cross-section, wherein the core is narrower in a fast-axis direction and wider in a slow-axis direction, the core including an annular protrusion that is Gaussian in transverse cross-section and has a width in the slow-axis direction and an annular extension in the fast-axis direction, and wherein a ratio of the width, the annular extension, and the bend radius is selected for single-mode operation of the optical fiber.
    Type: Grant
    Filed: September 17, 2015
    Date of Patent: January 3, 2017
    Assignee: RAYTHEON COMPANY
    Inventor: Makan Mohageg
  • Patent number: 9523816
    Abstract: An optical device includes an SOI substrate, the embedded insulating layer having a thickness of 200 nanometers (nm) or less; an optical waveguide comprising a Group III-V compound semiconductor material formed on top of the SOI substrate; and an optical leakage preventing layer formed inside the SOI substrate on a bottom side of the optical waveguide to prevent leakage of light from inside the optical waveguide towards the SOI substrate.
    Type: Grant
    Filed: March 10, 2015
    Date of Patent: December 20, 2016
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Shigeru Nakagawa, Seiji Takeda
  • Patent number: 9525312
    Abstract: The present disclosure describes a method for optically powering transducers and related transducers with a photovoltaic collector. An optical fiber power delivery method and a free space power delivery method are also provided. A fabrication process for making an optically powered transducer is further described, together with an implantable transducer system based on optical power delivery.
    Type: Grant
    Filed: August 31, 2015
    Date of Patent: December 20, 2016
    Assignee: CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Axel Scherer, Aditya Rajagopal, Seheon Kim, Andrew P. Homyk
  • Patent number: 9513431
    Abstract: In an optical waveguide having plural cores including a pair of adjacent cores with an identical core structure, a minimum value D of center-center distance between the adjacent cores is 15 ?m to 60 ?m, each of the plural cores has a bent portion fixed in a radius of curvature Rb of not more than 7 mm, a bend supplementary angle of the bent portion is 58° to 90°, a height of the optical waveguide is defined as a height of not more than 10 mm, and a crosstalk of the adjacent cores is not more than 0.01.
    Type: Grant
    Filed: February 19, 2016
    Date of Patent: December 6, 2016
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Tetsuya Hayashi
  • Patent number: 9435942
    Abstract: A method of designing multicore optical fibers is provided. A geometry for the core arrangement is selected. At least one of i) core width, ii) core position with respect to other cores, or iii) orientation with respect to incoming, outgoing, or at least partially traversing radiation such as an inscription beam are optimized. A design space is created in which no core shadows or blocks any other core with respect to incoming, outgoing, or at least partially traversing radiation. Optimization generally includes tracing tangents of core widths against an orthogonal axis and ensuring no overlap of space between said tangents on said axis. For twisted fiber, optimization also includes optimizing effective length and twist rate of the fiber. Devices entailing such fibers, such as multicore pump coupler and multicore fiber distributed feedback laser, are also contemplated.
    Type: Grant
    Filed: June 21, 2013
    Date of Patent: September 6, 2016
    Assignee: OFS FITEL, LLC
    Inventor: Paul S Westbrook
  • Patent number: 9411100
    Abstract: A photonic lantern spatial multiplexer that provides mode selectivity includes a multimode optical waveguide and a plurality of single mode optical waveguides. The single mode cores of the single mode optical waveguides merge with the multimode core of the multimode optical waveguide. At least two of the single mode cores have different respective single mode effective refractive indexes.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: August 9, 2016
    Assignee: Alcatel Lucent
    Inventors: Nicolas K. Fontaine, Roland Ryf
  • Patent number: 9400352
    Abstract: A polarization-maintaining optical fiber of the invention includes: a core; a pair of stress-applying parts disposed at both sides of the core at a distance; and a cladding coat that surrounds the core and the paired stress-applying parts. The maximum refractive index of the core is greater than each of maximum refractive indexes of a first cladding coat, a second cladding coat, and a third cladding coat. The maximum refractive index of the second cladding coat is lower than each of maximum refractive indexes of the first cladding coat and the third cladding coat. The coefficient of thermal expansion of each of stress-applying parts is greater than a coefficient of thermal expansion of the cladding coat. Each stress-applying part is provided to cut the second cladding coat at a position in a circumferential direction.
    Type: Grant
    Filed: February 23, 2015
    Date of Patent: July 26, 2016
    Assignee: FUJIKURA LTD.
    Inventors: Kazuyuki Hayashi, Katsuaki Izoe
  • Patent number: 9400351
    Abstract: A multi-core fiber (1) is a multi-core fiber including 10 or greater of even numbered cores and a cladding surrounding the core. In the even numbered cores, a half of cores (11a) are disposed in such a manner that centers are located on the apexes of a regular polygon (RP) whose center is at an origin point (O) in a cladding (20). In the even numbered cores, other cores (11b) are disposed in a manner that centers are located on perpendicular bisectors (LV) of the edges of a regular polygon on the inner side of the regular polygon (RP). The other cores (11b) are disposed in a specific range in the regular polygon (RP).
    Type: Grant
    Filed: February 27, 2014
    Date of Patent: July 26, 2016
    Assignees: FUJIKURA LTD., NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY
    Inventors: Katsuhiro Takenage, Yusuke Sasaki, Shioichiro Matsuo, Kunimasa Saitoh
  • Patent number: 9366807
    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: Grant
    Filed: January 23, 2015
    Date of Patent: June 14, 2016
    Assignee: FUJIKURA LTD.
    Inventors: Shoji Tanigawa, Katsuhiro Takenaga
  • Patent number: 9354387
    Abstract: In an optical waveguide having plural cores including a pair of adjacent cores with an identical core structure, a minimum value D of center-center distance between the adjacent cores is 15 ?m to 60 ?m, each of the plural cores has a bent portion fixed in a radius of curvature Rb of not more than 7 mm, a bend supplementary angle of the bent portion is 58° to 90°, a height of the optical waveguide is defined as a height of not more than 10 mm, and a crosstalk of the adjacent cores is not more than 0.01.
    Type: Grant
    Filed: June 4, 2015
    Date of Patent: May 31, 2016
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventor: Tetsuya Hayashi
  • Patent number: 9335467
    Abstract: A multi-core fiber for accommodating multiple single mode cores in one optical fiber is provided with multiple types of non-identical cores having different propagation constants. Each of the multiple types of non-identical cores includes a core part and a cladding part covering an outer periphery of the core part. The cladding part has a double cladding structure including a first cladding for surrounding an outer periphery of the core part and a second cladding on the outer side of the first cladding. In the multiple types of non-identical cores, an optical electromagnetic profile in the core part and the first cladding is confined within a range of the core part and the first cladding, restricting a leakage thereof to the second cladding, and the propagation constant of each non-identical core is made different using the refractive index of the first cladding as a parameter.
    Type: Grant
    Filed: August 22, 2012
    Date of Patent: May 10, 2016
    Assignee: NAT'L UNIVERSITY CORP. YOKOHAMA NAT'L UNIVERSITY
    Inventors: Yasuo Kokubun, Tatsuhiko Watanabe
  • Patent number: 9322989
    Abstract: An optical fiber includes a core region having a longitudinal axis. At least a portion of the core region has a substantially helical shape about a helical axis. The longitudinal axis may be substantially tangential to a helical bend in the optical fiber. A cladding region surrounds the core region. The core region and cladding region may be configured to support and guide the propagation of signal light in a fundamental transverse mode in the core region in the direction of the longitudinal axis. The fiber has a bend-induced gradient in its equivalent index of refraction over the portion of the core region. The fiber has a bend-induced equivalent index of refraction. At least a portion of cladding region has a graded refractive index opposite that of the bend-induced gradient. The cladding region may be configured to have a substantially flat equivalent index in response to a helical bend of the optical fiber.
    Type: Grant
    Filed: July 18, 2014
    Date of Patent: April 26, 2016
    Assignee: OFS FITEL, LLC
    Inventors: John M. Fini, Jeffrey W. Nicholson
  • Patent number: 9291768
    Abstract: A multicore fiber according to an aspect of the present invention includes a plurality of cores and a cladding surrounding the plurality of the cores. In this multicore fiber, a pair of cores is arranged and disposed on a linear line passed through the center of the cladding, the pair of the cores being adjacent to each other and having refractive indexes varied differently from the cladding to the cores.
    Type: Grant
    Filed: November 20, 2014
    Date of Patent: March 22, 2016
    Assignee: FUJIKURA LTD.
    Inventors: Itaru Ishida, Shoichiro Matsuo
  • Patent number: 9255026
    Abstract: Methods for making active laser fibers include the production of an optical fiber with disturbed (or deviated) cylindrical symmetry on the glass surface of the fiber. The methods include a preform containing a central core made of glass. In one embodiment, the preform is circular and surrounded by additional glass rods and an outer glass jacket tube. In a first alternative embodiment, this preform is merged during fiber drawing. In a second alternative embodiment, the preform merged in a process forming a compact glass body with disturbed cylindrical symmetry. This compact preform is drawn into a fiber under conditions maintaining the disturbed cylindrical symmetry.
    Type: Grant
    Filed: March 6, 2013
    Date of Patent: February 9, 2016
    Assignee: j-fiber, GmbH
    Inventors: Jurgen Rosenkranz, Wolfgang Haemmerle, Lothar Brehm, Katrin Roessner, Robert Hanf
  • Patent number: 9239426
    Abstract: An optical waveguide has: a core layer which includes at least one core portion for transmitting a light signal and at least two side cladding portions respectively provided at lateral sides of the core portion so as to be opposed to each other; and two cladding layers respectively provided at vertical sides of the core layer. The core layer is configured to have a horizontal refractive index distribution curve W in a width direction of a cross-sectional plane of the core layer. The horizontal refractive index distribution curve W has a region including at least two local minimum values, at least one first local maximum value and at least two second local maximum values smaller than the first local maximum value. A refractive index in whole of the horizontal refractive index distribution curve W continuously varies.
    Type: Grant
    Filed: September 20, 2011
    Date of Patent: January 19, 2016
    Assignee: SUMITOMO BAKELITE COMPANY LIMITED
    Inventors: Tetsuya Mori, Kimio Moriya, Hiroshi Owari