Utilizing Multiple Core Or Cladding Patents (Class 385/126)
  • Patent number: 11378740
    Abstract: An optical waveguide is provided and includes: a core forming layer with a high refractive index; and a first clad layer with a low refractive index, bonded to a first main surface of the core forming layer. The core forming layer is provided in its plane direction with a core portion, lateral clad portions each having one side adjacent to a corresponding side of the core portion, and high refractive index portions each adjacent to the other side of a corresponding one of the lateral clad portions. The core portion is provided in its plane direction with a central region, and GI regions in each of which a refractive index continuously decreases from the central region toward an interface with the corresponding one of the lateral clad portions. The lateral clad portions each include a region having a constant refractive index.
    Type: Grant
    Filed: November 9, 2018
    Date of Patent: July 5, 2022
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Shingo Maeda, Naoyuki Kondou, Toru Nakashiba, Junko Kurizoe
  • Patent number: 11347069
    Abstract: An optical fiber device may include a core including a primary section and a secondary section. The secondary section may include at least one insert element inserted within the primary section at an off-center location with respect to a center of the primary section. The secondary section may twist about an axis of the optical fiber device along a length of the optical fiber device. A rate of twist at which the secondary section twists about the axis may increase from a first end of the optical fiber device toward a second end of the optical fiber device. The secondary section being twisted about the axis may cause an optical beam, launched at the first end of the optical fiber device, to be at least partially converted to a rotary optical beam at the second end of the optical fiber device.
    Type: Grant
    Filed: December 4, 2019
    Date of Patent: May 31, 2022
    Assignee: Lumentum Operations LLC
    Inventors: Martin H. Muendel, Richard D. Faulhaber, James J. Morehead, Vincent Petit, Patrick Gregg
  • Patent number: 11314017
    Abstract: An optical fiber includes: a core portion made of glass; and a cladding portion made of glass, having a refractive index lower than the refractive index of the core portion, and positioned on an outer periphery of the core portion. Further, the cladding portion has an outer diameter smaller than 100 ?m, and the core portion has a relative refractive-index difference of 0.32% to 0.40% with respect to the cladding portion.
    Type: Grant
    Filed: September 3, 2020
    Date of Patent: April 26, 2022
    Assignee: FURUKAWA ELECTRIC CO., LTD.
    Inventor: Kazunori Mukasa
  • Patent number: 11269138
    Abstract: T/C, which is a ratio of an area T of a skirt part outside the boundary to an area C of the core region in a refractive index distribution, is 4% or more and 30% or less, the boundary is defined at a position where an absolute value of a change amount of the index becomes maximum between the center of the core region and the outer peripheral part of the first clad region, the area C of the core region is defined in a range from the center of the core region to the boundary in the radial direction, the area T of the skirt part is defined in a range from the boundary to the outer peripheral part of the first clad region.
    Type: Grant
    Filed: July 21, 2020
    Date of Patent: March 8, 2022
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventor: Kiichiro Kawasaki
  • Patent number: 11249251
    Abstract: Methods and devices that provide a variable-bandwidth optical filter with frequency tuning are disclosed. A universal variable bandwidth optical filter architecture is disclosed, based on microring resonators that can vary both operation wavelength and bandwidth with no extra complexity relative to conventional wavelength tunable filters. The filter architecture provides a universal filter design for any arbitrary shape of filter response, such as second-order, fourth-order, sixth-order, and so on. The filter characteristics—insertion loss, in-band ripple, and out-of-band rejection level—may be maintained over the bandwidth tuning range. There is no need for extra heaters to tune the filter's operating bandwidth, as the same heaters used to tune the filter frequency can be used to tune filter bandwidth. The device can be used as an add/drop filter.
    Type: Grant
    Filed: July 15, 2020
    Date of Patent: February 15, 2022
    Assignee: Huawei Technologies Co. Ltd.
    Inventors: Yang Ren, Vien Van, Zhiping Jiang
  • Patent number: 11137538
    Abstract: A multicore optical fiber that includes a plurality of waveguiding cores disposed in a cladding. The plurality of cores are situated adjacent to at least one other core with a core center to core center spacing being not larger than 10 times the radius of the average core, such that the greater than 10% of the light will couple from one core to the adjacent core over a propagating distance of 1 cm, along the fiber length so as to provide coupling between the adjacent cores and to enable quantum walk. The plurality waveguiding cores are disposed in the cladding in a ring distribution or at least a portion of the ring distribution.
    Type: Grant
    Filed: September 28, 2020
    Date of Patent: October 5, 2021
    Assignee: Corning Incorporated
    Inventors: Nicholas Francis Borrelli, Rostislav Radiyevich Khrapko, Dan Trung Nguyen, Thien An Thi Nguyen, Daniel Aloysius Nolan
  • Patent number: 11042049
    Abstract: Thermal isolation elements are provided in wafer-bonded silicon photonics that include a photonic platform, including a heating element and an optical waveguide that are disposed between a first surface and a second surface (opposite to the first surface) of the photonic platform; a substrate, including a third surface and a fourth surface (opposite to the third surface); wherein the first surface of the photonic platform is bonded to the third surface of the substrate; and wherein a cavity is defined by a trench in one or more of: the first surface and extending towards, but not reaching, the second surface, and the third surface and extending towards, but not reaching, the fourth surface; wherein the cavity is filled with a gas of a known composition at a predefined pressure; and wherein the cavity is aligned with the optical waveguide and the heating element.
    Type: Grant
    Filed: October 9, 2019
    Date of Patent: June 22, 2021
    Assignee: Cisco Technology, Inc.
    Inventor: Jock T. Bovington
  • Patent number: 11009657
    Abstract: Spliced multi-clad optical fibers with a cladding light stripper (CLS) encapsulating the splice. The splice may facilitate conversion between two optical fibers having different architectures, such as different core and/or cladding dimensions. The CLS may comprise a first length of fiber on a first side of the splice, and a second length of fiber on a second side of the splice, encapsulating the splice within the lengths of the CLS. The splice may abut one or more of the lengths of the CLS, or may be separated from one or more lengths of the CLS by an intermediate length of a first and/or second fiber joined by the splice.
    Type: Grant
    Filed: August 23, 2019
    Date of Patent: May 18, 2021
    Assignee: NLIGHT, INC.
    Inventors: Ryan Hawke, Teemu Kokki, Shaun Hampton, Chris Luetjen
  • Patent number: 10983267
    Abstract: A quasi-single-mode (QSM) optical fiber includes a core and a cladding surrounding the core. The core includes a centerline and an outer edge. The cladding includes an interior edge and an exterior edge. The cladding has a cladding outer diameter defined by the exterior edge of the cladding. The cladding outer diameter may be in the range of greater than 170 ?m to about 200 ?m. The QSM fiber has a cabled cutoff wavelength that is greater than about 1530 nm. The core and the cladding support a fundamental mode LP01 and a higher-order mode LP11. The fundamental mode LP01 has an effective area Aeff>150 ?m2.
    Type: Grant
    Filed: February 6, 2019
    Date of Patent: April 20, 2021
    Assignee: Corning Incorporated
    Inventors: John David Downie, Ming-Jun Li, William Allen Wood, Aramais Robert Zakharian
  • Patent number: 10852473
    Abstract: The invention relates to an optical fiber 1 comprising a core 2 and a cladding 3 surrounding the core 2 and having an outer diameter of 125 ?m, the optical fiber 1 comprising a cured primary coating 4 directly surrounding the cladding 3 and a cured secondary coating 5 directly surrounding the cured primary coating 4, said cured primary coating 4 having a thickness t1 between 10 and 18 ?m and an in-situ tensile modulus Emod1 between 0.10 and 0.18 MPa, said cured secondary coating 5 having a thickness t2 lower or equal to 18 ?m and an in-situ tensile modulus Emod2 between 700 and 1200 MPa, wherein said first and second thicknesses and said first and second in-situ tensile moduli satisfy the following equation: 4%<(t1×t2×Emod1×Emod23)/(t1_norm×t2_norm×Emod1_norm×Emod2_norm3)<50%.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: December 1, 2020
    Assignee: Draka Comteq France
    Inventors: Alain Pastouret, Pierre Sillard, Louis-Anne de Montmorillon
  • Patent number: 10845533
    Abstract: An optical fiber having a Bragg grating along a non-photosensitized grating region thereof and a pristine polymer coating around the grating region with the Bragg grating having been written through the polymer coating has a mechanical resistance that is greater than 20% of the mechanical resistance of an identical grating-free optical fiber.
    Type: Grant
    Filed: October 26, 2018
    Date of Patent: November 24, 2020
    Assignee: UNIVERSITÉ LAVAL
    Inventors: Martin Bernier, Réal Vallée, François Trépanier, Julien Carrier
  • Patent number: 10823917
    Abstract: The embodiment relates to an optical connection component including a bent optical fiber having a bent portion including a region where a curvature of the bent portion is maintained at 0.4 [l/mm] or more while substantially no bending stress remains. The bent optical fiber comprises a core, a first cladding, a second cladding, and a third cladding. Based on the third cladding, a relative refractive index difference ?1 of the core, a relative refractive index difference ?2 of the first cladding, and a relative refractive index difference ?3 of the second cladding satisfy relationships of ?1>?2>?3 and ?3<?0.5 [%]. The product V3 of the ?3 and a cross-sectional area S of the second cladding is less than ?200 [%·?m2]. The curvature in the bent portion is 0.6 [l/mm] or less over an entire length of the bent portion.
    Type: Grant
    Filed: December 12, 2019
    Date of Patent: November 3, 2020
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Tetsuya Nakanishi, Yasuomi Kaneuchi, Yuuichi Mitose
  • Patent number: 10690928
    Abstract: An apparatus for heat deposition in additive manufacturing may include: a first optical beam source configured to generate a first optical beam; a second optical beam source configured to generate a second optical beam; and/or an optical system. The optical system may be configured to move the generated first optical beam over a target area. The optical system may be further configured to move the generated second optical beam over the target area so that a path of the second optical beam moving over the target area is dithered about a path of the first optical beam moving over the target area. The optical system may be configured to focus the generated first optical beam at a plane of a target area. The optical system may be further configured to focus the generated second optical beam at the plane of the target area.
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: June 23, 2020
    Assignee: NLIGHT, INC.
    Inventors: Scott Karlsen, Robert Martinsen, Dahv A. V. Kliner, Roger Farrow
  • Patent number: 10670812
    Abstract: An optical fiber includes: a core that includes quartz glass doped with a core updopant; an inner cladding that includes quartz glass doped with a cladding updopant and a downdopant and that covers a circumferential surface of the core; and an outer cladding that includes quartz glass and that covers an outer circumferential surface of the inner cladding. A refractive index of the inner cladding is substantially equal to a refractive index of the outer cladding. The inner cladding contains the cladding updopant at a concentration such that a refractive index increase rate ascribed to the cladding updopant falls within a range of 0.25% to 0.5%.
    Type: Grant
    Filed: May 30, 2017
    Date of Patent: June 2, 2020
    Assignee: Fujikura Ltd.
    Inventors: Keisuke Hirakawa, Kentaro Ichii, Kazuyuki Hayashi
  • Patent number: 10663671
    Abstract: An integrated fiber-ferrule useable as an optical coupling element includes a core directly contacting a cladding layer that has a lower index of refraction than that of the core, without an intervening adhesive. The cladding layer outer diameter is at least 100 times greater than that of the core, and matches an outer diameter of a standard ferrule. The integrated fiber-ferrule may be produced by drawing a glass preform into a cane, cutting the cane into sections, and shaping end faces of the cut sections (e.g., using a laser). To form a fiber optic assembly, a front end of an optical fiber core may be fusion spliced to a rear end of the core of the integrated fiber-ferrule. Use of an integrated fiber-ferrule permits reduction of core to fiber eccentricity, and reduction of connector insertion losses.
    Type: Grant
    Filed: September 27, 2018
    Date of Patent: May 26, 2020
    Assignee: Corning Research & Development Corporation
    Inventors: Ming-Jun Li, Qi Wu
  • Patent number: 10578427
    Abstract: The invention discloses an apparatus for measuring the torsion between a first point (41) and a second point (42) of a test object (1), said second point being spaced apart from the first point.
    Type: Grant
    Filed: December 22, 2017
    Date of Patent: March 3, 2020
    Assignee: fos4X GmbH
    Inventors: Mathias Müller, Florian Rieger, Thomas Grübler, Benjamin Zorn
  • Patent number: 10570048
    Abstract: A system and process for making a thin, soot particle or glass sheet is provided. The system includes a soot deposition plate having a deposition surface and a glass soot generating device spaced from the deposition surface along a first axis. The glass soot generating device is configured to generate glass soot particles and to deliver the glass soot particles through an outlet and on to the deposition surface in a layer having a thickness of less than 5 mm. At least one of the soot deposition plate and the glass soot generating device is movable to cause relative movement between the deposition surface of the soot deposition plate and the glass soot generating device. A thin soot or sintered soot sheet is also provided. The soot sheet has a variable surface topography that varies along at least two axes.
    Type: Grant
    Filed: February 13, 2015
    Date of Patent: February 25, 2020
    Assignee: Corning Incorporated
    Inventor: Daniel Warren Hawtof
  • Patent number: 10466426
    Abstract: A drawer structure, etc. of an optical fiber from an optical module is disclosed. An optical fiber drawer structure is configured by a roughly cylindrical passage through which an optical fiber passes being connected to a housing. The passage includes a sleeve connected to an outer periphery of the housing and a lid part connected to a tip side of the sleeve. The interior of the passage (sleeve) is provided with a fixing member to fix the optical fiber to the passage. A reduced diameter part and an expanded diameter part are formed in the lid part.
    Type: Grant
    Filed: June 6, 2018
    Date of Patent: November 5, 2019
    Assignee: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Etsuji Katayama, Masakazu Yoshihara, Yuta Ishige
  • Patent number: 10422948
    Abstract: An optical fiber includes a core, a depressed layer surrounding the core, and a cladding surrounding the depressed layer, where a refractive index profile of the core is an ? power distribution in which an index ? is 3 or more and 6 or less, a relative refractive index difference ?? of the depressed layer with respect to the adding is set such that an absolute value |??| thereof is 0.01% or more and 0.05% or less, a radius r1 of the core and an outer circumference radius r2 of the depressed layer are set such that a ratio r1/r2 thereof is 0.2 or more and 0.5 or less, a cable cutoff wavelength ?cc of 22 m is 1260 nm or less, and a mode field diameter MFD at a wavelength of 1310 nm is 8.6 ?m or more and 9.5 ?m or less.
    Type: Grant
    Filed: January 23, 2018
    Date of Patent: September 24, 2019
    Assignee: FUJIKURA LTD.
    Inventor: Ryo Maruyama
  • 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: 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: 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: 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