With Graded Index Core Or Cladding Patents (Class 385/124)
  • Patent number: 9554694
    Abstract: Methods and apparatus for delivering a neurostimulator to a target tissue are provided which may include any number of features. One feature is a delivery tool comprising a handle portion, an elongate shaft comprising a contoured distal portion, a visualization system embedded in the elongate shaft, and an insertion groove on the elongate shaft configured to deploy the neurostimulator. The contoured distal portion can be shaped and configured to maintain contact with a posterior maxilla and elevate a periosteum off of the posterior maxilla to avoid soft tissue dissection. In some embodiments, the neurostimulator is implanted in close proximity to or touching the sphenopalatine ganglion.
    Type: Grant
    Filed: June 23, 2014
    Date of Patent: January 31, 2017
    Assignee: Autonomic Technologies, Inc.
    Inventors: Benjamin David Pless, Carl Lance Boling, Anthony V. Caparso
  • Patent number: 9547129
    Abstract: An apparatus for converting fiber mode to waveguide mode. The apparatus includes a silicon substrate member and a dielectric member having an elongated body. Part of the elongated body from a back end overlies the silicon substrate member and remaining part of the elongated body up to a front end is separated from the silicon substrate member by a second dielectric material at an under region. The apparatus also includes a waveguide including a segment from the back end to a tail end formed on the dielectric member at least partially overlying the remaining part of the elongated body. The segment is buried in a cladding overlying entirely the dielectric member. The cladding has a refractive index that is less than the waveguide but includes an index-graded section with decreasing index that is formed at least over the segment from the tail end toward the back end.
    Type: Grant
    Filed: January 21, 2015
    Date of Patent: January 17, 2017
    Assignee: INPHI CORPORATION
    Inventors: Masaki Kato, Radhakrishnan L. Nagarajan
  • Patent number: 9535224
    Abstract: An optical fiber cable has a sectional area of Ac [?m2] and housing a number N of optical fibers. A transmission loss ?dB [dB/km], a mode field diameter W [?m], an effective area Aeff [?m2], an effective length Leff [km], and a wavelength dispersion D [ps/nm/km] of each of the optical fibers at a wavelength of 1550 nm satisfy a predetermined equation.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: January 3, 2017
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Yoshinori Yamamoto, Masaaki Hirano, Masakazu Takami
  • Patent number: 9507084
    Abstract: Described is a general strategy of bend-compensated, single-mode LMA fibers extended into a regime with higher total index contrast and where a larger gradient is used to cancel the perturbation of a tighter anticipated bend.
    Type: Grant
    Filed: June 10, 2014
    Date of Patent: November 29, 2016
    Assignee: OFS FITEL, LLC
    Inventors: John M Fini, Jeffrey W Nicholson, Thierry F Taunay
  • Patent number: 9500930
    Abstract: Various technologies pertaining to an on-chip entangled photon source are described herein. A light source is used to pump two resonator cavities that are resonant at two different respective wavelengths and two different respective polarizations. The resonator cavities are coupled to a four-wave mixing cavity that receives the light at the two wavelengths and outputs polarization-entangled photons.
    Type: Grant
    Filed: March 9, 2016
    Date of Patent: November 22, 2016
    Assignee: Sandia Corporation
    Inventors: Daniel B. S. Soh, Scott E. Bisson
  • Patent number: 9477037
    Abstract: An optical fiber for efficient coupling of optical signals to photonic devices. The glass optical fiber includes a core region, an optional inner cladding region, a depressed index region, and an outer cladding region. The relative refractive index profile of the fiber is designed to provide large effective area and low bending losses at wavelengths of interest for photonic devices. The photonic devices may be silicon photonic devices with an operating wavelength at or near 1310 nm.
    Type: Grant
    Filed: April 5, 2016
    Date of Patent: October 25, 2016
    Assignee: Corning Incorporated
    Inventors: Scott Robertson Bickham, Dana Craig Bookbinder, Ming-Jun Li, Pushkar Tandon
  • Patent number: 9470841
    Abstract: Multicore optical fibers that include between two and ten multimode cores surrounded by a cladding matrix and symmetrically arranged about a fiber axis are disclosed, with no core running along the fiber axis. The cores include a trench to stabilize delays of the higher order modes, which tend to propagate faster than do the central modes due to the amount of power at the core-clad interface. The trench also suppresses crosstalk and power leakage. The core configuration promotes efficient optical alignment and optical coupling with other multicore optical fibers or light sources, such as VSCEL and silicon-photonics light sources.
    Type: Grant
    Filed: November 18, 2014
    Date of Patent: October 18, 2016
    Assignee: Cornning Incorporated
    Inventors: Scott Robertson Bickham, Douglas Llewellyn Butler, Ming-Jun Li
  • Patent number: 9459401
    Abstract: An optical waveguide having a cladding layer formed of high-purity glass, or a cladding layer formed of high-purity isotope-proportion modified glass, and with a core of high-purity isotope-proportion-modified glass with the index of refraction of the core glass greater than the index of refraction of the cladding glass, said high-purity isotope-proportion-modified core material having a Si-29-isotope proportion at most 4.447% Si-29 (atom/atom) of all silicon atoms in said core, or at least 4.90% of Si-29 (atom/atom) atoms in said core, or having a Ge-73 isotope proportion of at most 7.2% Ge-73 (atom/atom) of all germanium atoms in said core, or at least 8.18% of Ge-73 (atom/atom) of Germanium atoms in said core region.
    Type: Grant
    Filed: April 20, 2015
    Date of Patent: October 4, 2016
    Inventor: James Dalton Bell
  • Patent number: 9405062
    Abstract: A multimode optical fiber includes a central core and an outer cladding (e.g., an outer optical cladding). Typically, the optical fiber's central core is a depressed, central core having an alpha-index profile (i.e., a graded-index profile), an outer radius r1, and a maximum refractive index difference ?n1 with respect to the outer cladding. The central core's alpha-index profile has a minimum refractive index at the central core's outer radius r1 that corresponds to a refractive index difference ?nend with respect to the outer cladding. Exemplary optical-fiber embodiments may include an inner cladding having an outer radius r2 and a width w2. Exemplary optical-fiber embodiments may include a buried trench having a width w3 and an outer radius r3. Furthermore, exemplary optical-fiber embodiments may include an intermediate cladding having an outer radius r4 and a width w4.
    Type: Grant
    Filed: April 26, 2012
    Date of Patent: August 2, 2016
    Assignee: Draka Comteq B.V.
    Inventors: Gertjan Krabshuis, Adrian Amezcua-Correa, Frans Gooijer, Gilles Melin, Gerard Kuyt, Franciscus Johannes Achten, Stephanus Gerardus Fransiscus Geerings, Marianne Bigot-Astruc
  • Patent number: 9360619
    Abstract: An optical fiber including a multimode core having a radius, R1, and a maximum relative refractive index, ?1MAX, at a wavelength ?0, an inner clad region surrounding the core and having a radial thickness, T2, and a minimum relative refractive index, ?2MIN, of about 0.0% at a wavelength of ?0, and an outer clad layer, which is doped with chlorine at greater than or equal to 0.5 weight %, surrounding the inner clad region and having a radial thickness, T3, and a maximum relative refractive index, ?3MAX, at a wavelength of ?0. The optical fiber satisfies the following relationship: ?1MAX>?3MAX>?2MIN, and the optical fiber exhibits an overfilled bandwidth of greater than or equal to about 1.5 GHz-km at ?0.
    Type: Grant
    Filed: June 9, 2015
    Date of Patent: June 7, 2016
    Assignee: Corning Incorporated
    Inventors: Dana Craig Bookbinder, Oleksandr Kogan, Ming-Jun Li, Snigdharaj Kumar Mishra, Pushkar Tandon
  • Patent number: 9341771
    Abstract: A multimode optical fiber includes a central core surrounded by an outer cladding. The central core has a graded-index profile with respect to the outer cladding and an outer radius r1 of between about 30 microns and 50 microns (e.g., between about 35 microns and 45 microns). The optical fiber also includes an inner cladding positioned between the central core and the outer cladding, and a depressed trench positioned between the inner cladding and the outer cladding. The multimode optical fiber exhibits reduced bending losses.
    Type: Grant
    Filed: March 23, 2012
    Date of Patent: May 17, 2016
    Assignee: Draka Comteq, B.V.
    Inventors: Denis Molin, Pierre Sillard, Marianne Bigot-Astruc, Frans Gooijer, Franciscus Johannes Achten
  • Patent number: 9297953
    Abstract: A graded refractive index bending-resistant multimode optical fiber includes a core layer and claddings. The core layer has a radius in a range of 20-50 ?m; refractive indexes being a graded refractive index distribution with a distribution exponent ? in a range of 1.89-1.97; and a maximum relative refractive index difference (RRID) ?1% max in a range of 0.9%-2.72%. The claddings has an inner cladding surrounding the core layer, an intermediate cladding surrounding the inner cladding and an outer cladding surrounding the inner cladding. The inner cladding has a radius in a range of 22-57 ?m, and an RRID ?2% in a range of ?0.02%-0.02%. The intermediate cladding is a pure quartz glass layer, and has a radius in a range of 32-60 ?m, and an RRID ?3% in a range of ?0.01%-0.01%.
    Type: Grant
    Filed: November 21, 2014
    Date of Patent: March 29, 2016
    Assignee: EVERPRO TECHNOLOGIES COMPANY LTD.
    Inventors: Song Wang, Zhipan Zhou, Yongtao Liu, Jin Xu, Mingfeng Fan, Shuqiang Zhang, Wei Wang
  • Patent number: 9291770
    Abstract: A method of manufacturing a radiation-resistant optical fiber and a thus-obtained radiation-resistant optical fiber, the method includes the following steps: a) manufacturing a silica optical fiber preform; b) forming, in the preform, a longitudinal cavity; c) drawing the preform so as to form an optical fiber (1) including a core (2), an optical cladding (6) and at least one longitudinal cavity (3) having at least one opening (13) at one end of the optical fiber (1); d) applying, during step c) of fiber drawing, a gas-tight coating (4); e) exposing the optical fiber (1) to a gaseous substance, including preferably gaseous hydrogen and/or gaseous deuterium, in such a way to incorporate the gaseous substance in silica via the opening (13); and f) closing any opening (13) at both ends of the optical fiber.
    Type: Grant
    Filed: July 1, 2014
    Date of Patent: March 22, 2016
    Assignees: IXBLUE, CENTRE NATIONAL D'ETUDES SPATIALES—CNES
    Inventors: Thierry Robin, Arnaud Laurent
  • Patent number: 9293888
    Abstract: According to an embodiment of the disclosure, a system for producing a higher power laser beam is provided. The system includes an optical fiber having a length. The optical fiber is configured to receive inputs from multiple laser pumps and an input from a Stokes seed laser pump. The optical fiber has a core that is doped. The core, when viewed from a cross-section of the optical fiber, has a higher concentration of doping at a location near an axis of the optical fiber than a location further from the axis of the optical fiber. The optical fiber is also configured to convert pump power to Stokes power along the length of the optical fiber when subjected to a Stimulated Raman Scattering (SRS) process.
    Type: Grant
    Filed: October 30, 2013
    Date of Patent: March 22, 2016
    Assignee: Raytheon Company
    Inventors: David A. Rockwell, Vladimir V. Shkunov
  • Patent number: 9285536
    Abstract: An optical fiber comprises a glass portion comprising a core and a cladding surrounding the core, and, a resin portion comprising a non-removable resin layer tightly covering the glass portion and comprising an ultraviolet curing resin and a buffer layer covering the non-removable resin layer and comprising an ultraviolet curing resin. A diameter of the core falls within a range from 20 ?m or larger to 80 ?m or smaller, and an outer diameter of the non-removable resin layer falls within a range from 120 ?m or larger to 127 ?m or smaller. In this optical fiber, when flexural rigidity of the glass portion is EI(g) and flexural rigidity of the resin portion is EI(r), EI(g)?EI(r) is satisfied.
    Type: Grant
    Filed: January 8, 2015
    Date of Patent: March 15, 2016
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Yuya Homma, Itaru Sakabe
  • Patent number: 9207397
    Abstract: A light-diffusing optical fiber that includes a core region in the fiber that comprises a core glass composition; and an inner cladding in the fiber that surrounds the core region and comprises a cladding glass composition that substantially differs from the core glass composition. The core glass composition comprises a doped, low-melting point silica glass having less than 90% by weight SiO2, and the numerical aperture of the fiber is greater than or equal to 0.4. Further, light-diffusing optical fiber bundles that include a jacket comprising a scattering element; and a plurality of the light-diffusing optical fibers arranged within the jacket. Also, light-diffusing optical fiber bundles that include a transparent jacket; and a plurality of the light-diffusing optical fibers arranged within the jacket, the fibers further configured with an outer cladding having a plurality of scattering elements.
    Type: Grant
    Filed: January 21, 2014
    Date of Patent: December 8, 2015
    Assignee: Corning Incorporated
    Inventors: Kevin Wallace Bennett, Stephan Lvovich Logunov
  • Patent number: 9201192
    Abstract: In one aspect of the invention, the bend insensitive single-mode optical fiber includes a core layer and cladding layers having an inner cladding layer, a trench cladding layer and an outer cladding layer sequentially formed surrounding the core layer from inside to outside. For the core layer, the diameter is 7-7.9 ?m, and the relative refractive index difference ?1 is between 4.6×10?3 and 6.5×10?3. For the inner cladding layer, the diameter is 16.5-20 ?m, and a relative refractive index difference ?2 is between ?3×10?4 and 3×10?4. For the trench cladding layer, the diameter is 33-40 ?m, and the relative refractive index difference ?3 is between ?2.9×10?3 and ?7.3×10?3, changes in a gradient manner and increases gradually from outside to inside, where a relative refractive index difference ?32 at an outermost interface is smaller than a relative refractive index difference ?31 at an innermost interface.
    Type: Grant
    Filed: March 4, 2014
    Date of Patent: December 1, 2015
    Assignee: YANGTZE OPTICAL FIBRE AND CABLE JOINT STOCK LIMITED COMPANY
    Inventors: Lei Zhang, Yiwen Wu, Ming Ye, Mingfeng Mao, Zhiyong Wang, Ruichun Wang, Raadjkoemar Matai
  • Patent number: 9188736
    Abstract: An optical fiber having both low bend loss. The fiber has a central core region having refractive index ?1, an inner cladding region having an outer radius r2>17 microns and refractive index ?2 and a second cladding region surrounding the inner cladding region having refractive index ?3. The fiber profile segments may be arranged so that ?1>?3>?2. The fiber may exhibit a profile volume, V2 of the inner cladding region, calculated between r1 and r2, is at least 30% ?micron2.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: November 17, 2015
    Assignee: Corning Incorporated
    Inventors: Snigdharaj Kumar Mishra, Pushkar Tandon
  • Patent number: 9170369
    Abstract: A graded refractive index bending-resistant multimode optical fiber includes a core layer and claddings. The core layer has a radius in a range of 22.5-27.5 ?m; refractive indexes being a gradient-graded refractive index distribution with a distribution exponent ? in a range of 1.99-2.06; and a maximum relative refractive index difference (RRID) ?1% max in a range of 0.9%-1.3%. The claddings has an inner cladding surrounding the core layer, an intermediate cladding surrounding the inner cladding and an outer cladding surrounding the inner cladding. The inner cladding has a radius in a range of 25.5-34.5 ?m, and an RRID ?2% in a range of ?0.02%-0.02%. The intermediate cladding is a pure quartz glass layer, and has a radius in a range of 30.5-49.5 ?m, and an RRID ?3% in a range of ?0.01%-0.01%. The outer cladding has a radius in a range of 61.5-63.5 ?m, and an RRID ?4% is in a range of ?0.20%-0.30%.
    Type: Grant
    Filed: November 19, 2014
    Date of Patent: October 27, 2015
    Assignee: EVERPRO TECHNOLOGIES COMPANY LTD.
    Inventors: Song Wang, Zhipan Zhou, Yongtao Liu, Jin Xu, Mingfeng Fan, Shuqiang Zhang, Wei Wang
  • Patent number: 9164229
    Abstract: The invention relates to a bend insensitive gradient index multi-mode light conducting fiber comprising a leakage mode dependent optical core diameter that is uniform over its length and a numerical aperture that is uniform over its length, wherein for a light wavelength of 850 nm and an overfilled launch (OFL), the optical core diameter for a fiber length in a range between 2 m and 100 m decreases by less than 5% and the numerical aperture decreases by less than 2.5% and the curvature related attenuation increase for two turns and a curvature radius of 7.5 mm is less than 0.2 db.
    Type: Grant
    Filed: July 23, 2014
    Date of Patent: October 20, 2015
    Assignee: J-FIBER GMBH
    Inventors: Wolfgang Hämmerle, Christian Genz, Lothar Brehm, Falk Wirth
  • Patent number: 9158066
    Abstract: An optical fiber includes a core region having a longitudinal axis. A cladding region surrounds the core region. The core region and cladding region are configured to support and guide the propagation of signal light in a fundamental transverse mode in the core region in the directions of the axis. The fiber has a bend-induced gradient of its equivalent index of refraction indicative of a loss in guidance of the mode. At least a portion of cladding region has a graded index of refraction opposite the bend-induced gradient. The cladding region is configured to have a substantially flat equivalent index in response to a bend of the optical fiber.
    Type: Grant
    Filed: December 14, 2012
    Date of Patent: October 13, 2015
    Assignee: OFS FITEL, LLC
    Inventors: John M Fini, James W Fleming, Jeffrey W Nicholson, Thierry F Taunay, Man Yan
  • Patent number: 9128236
    Abstract: An inexpensive low-attenuation optical fiber 1 suitable for use as an optical transmission line in an optical access network is a silica based glass optical fiber and includes a core 11 including the center axis, an optical cladding 12 surrounding the core, and a jacket 13 surrounding the optical cladding. The core contains GeO2 and has a relative refractive index difference ?core, based on the optical cladding, greater than or equal to 0.35% and less than or equal to 0.50% and has a refractive index volume v greater than or equal to 0.045 ?m2 and less than or equal to 0.095 ?m2. The jacket has a relative refractive index difference ?J greater than or equal to 0.03% and less than or equal to 0.20%. Glass constituting the core has a fictive temperature higher than or equal to 1400° C. and lower than or equal to 1590° C. Residual stress in the core is compressive stress that has an absolute value greater than or equal to 5 MPa.
    Type: Grant
    Filed: February 20, 2015
    Date of Patent: September 8, 2015
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Tetsuya Nakanishi, Tatsuya Konishi, Kazuya Kuwahara
  • Patent number: 9110220
    Abstract: A multimode optical fiber, and a method of making the fiber, are provided according to the following steps and elements: forming a core preform with a graded refractive index that includes silica and an up-dopant; drawing the core preform into a core cane; forming an inner annular segment preform that includes silica soot and an up-dopant surrounding the core cane; and forming a depressed-index annular segment preform that includes silica soot surrounding the inner annular segment preform. The method also includes the steps: forming an outer annular segment preform that includes silica soot and an up-dopant surrounding the depressed-index annular segment preform; doping the inner, depressed-index and outer annular segment preforms simultaneously or nearly simultaneously with a down-dopant; and consolidating the segment preforms simultaneously or nearly simultaneously into inner, depressed-index and outer annular segments.
    Type: Grant
    Filed: July 16, 2013
    Date of Patent: August 18, 2015
    Assignee: Corning Incorporated
    Inventors: Scott Robertson Bickham, Robert Arnold Knowlton, Kimberly Wilbert Smith
  • Patent number: 9110352
    Abstract: A high confinement nonlinear optical fiber is provided along with methods of parametric amplification for use thereof The nonlinear optical fiber may include a plurality of concentric layers which are configured to provide different guiding regimes to low-frequency and high-frequency components through transverse geometry and refractive index profiling, thus reducing waveguide dispersion. The resulting optical fiber provides a parametric device with phase-matching in any spectral region of interest, such that a fiber optic parametric amplifier (FOPA) implementing the optical fiber can amplify in any spectral window of interest. A narrow-band FOPA configured to minimize phase mismatching is also provided for use with the optical fiber, and may be implemented as a light source or a monochromator.
    Type: Grant
    Filed: July 3, 2013
    Date of Patent: August 18, 2015
    Assignee: The Regents of the University of California
    Inventors: Ping Piu Kuo, Stojan Radic
  • Patent number: 9075183
    Abstract: Optical fiber designs are depicted with a core having an alpha profile inner portion and a steep vertical step between the core and a cladding with no shoulder, referred to herein as a truncated core. A further aspect of this invention can include a trench between the truncated core and cladding. In this embodiment, the core performs as not only as the primary light guiding structure, but now also functions essentially the same as that of a trench structure. Thus, what was formally a trench can now be much less negative or even positive. Another embodiment of the present invention includes an optical fiber having a truncated core with the addition of a ledge or shoulder between the core and vertical step, followed directly by a cladding.
    Type: Grant
    Filed: February 22, 2011
    Date of Patent: July 7, 2015
    Assignee: OFS FITEL, LLC
    Inventors: Xinli Jiang, Jinkee Kim, George Oulundsen, Yi Sun, Durgesh S. Vaidya, Man F. Yan
  • Patent number: 9069114
    Abstract: A single-mode optical fiber for transmitting optical signals includes a central core region for guiding the optical signals, and a cladding region surrounding the core region and including a void-containing annular layer containing randomly distributed voids, wherein the void-containing layer is doped with fluorine at a concentration of less than 1 wt % and has a radial thickness equal to or smaller than 3 ?m.
    Type: Grant
    Filed: July 23, 2010
    Date of Patent: June 30, 2015
    Assignee: PRYSMIAN S.P.A.
    Inventors: Antonio Adigrat, Franco Cocchini, Antonio Collaro, Antonello Schiaffo
  • Patent number: 9051516
    Abstract: The method described herein allows for melt stabilization and vapor-phase synthesis of a cesium germanium halide utilizing germanium dihalides formed in situ. This disclosure allows for the melting of cesium germanium halides without decomposition, which allows for growing crystals of these materials from the melt. This disclosure allows for a direct synthesis of these materials without the use of water or the introduction of other possible contaminants.
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: June 9, 2015
    Assignee: The United States of America, as represented by the Secretary of the Navy
    Inventors: Steven R. Bowman, Nicholas J. Condon, Shawn P. O'Connor
  • Publication number: 20150147039
    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: Application
    Filed: November 20, 2014
    Publication date: May 28, 2015
    Applicant: FUJIKURA LTD.
    Inventors: Itaru Ishida, Shoichiro Matsuo
  • Publication number: 20150139595
    Abstract: A device for converting transverse spatial profile of intensity of a light beam, using a microstructured optical fiber. Transverse dimensions of the fiber vary longitudinally and both its ends have opto-geometrical parameters such that at the wavelength of the beam the fiber has a fundamental mode having two different profile shapes at its two ends. Thus by introducing the beam with one of the profiles through one of the two ends, the beam emerges through the other end with the other profile, whose shape is different from that of the profile of the introduced beam.
    Type: Application
    Filed: March 5, 2013
    Publication date: May 21, 2015
    Applicants: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENE ALT, UNIVERSITE LILLE 1 SCIENCES ET TECHNOLOGIES, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
    Inventors: Emmanuel Hugonnot, Arnaud Mussot, Yves Quiquepois, Geraud Bouwmans, Laurent Bigot, Constance Valentin
  • Publication number: 20150139596
    Abstract: A multicore fiber includes a plurality of cores and a cladding that encloses the plurality of the cores. The plurality of the cores is arranged and disposed on a linear line passed through the center of the cladding. A difference in the cutoff wavelength between an outer core located at the outermost position and an inner core located next to the outer core is set at a wavelength of 100 nm or less.
    Type: Application
    Filed: November 14, 2014
    Publication date: May 21, 2015
    Applicant: FUJIKURA LTD.
    Inventors: Itaru Ishida, Shoichiro Matsuo
  • Patent number: 9036998
    Abstract: An undersea long-haul transmission system includes an optical fiber transmission span and a coherent detection and digital signal processing module for providing dispersion compensation. The transmission span includes at least one fiber pair comprising substantially equal lengths of a positive-dispersion first fiber and a negative-dispersion second fiber that are configured to provide a signal output at transmission distances greater than 10,000 km, in which the combined accumulated dispersion across the operating bandwidth does not exceed the dispersion-compensating capacity of the coherent detection and digital signal processing module. Further described is a fiber for use in an undersea long-haul transmission span. At a transmission wavelength of 1550 nm, the fiber has a dispersion coefficient in the range of ?16 to ?25 ps/nm·km, and a dispersion slope in the range of 0.04 to 0.02 ps/nm2·km.
    Type: Grant
    Filed: August 16, 2013
    Date of Patent: May 19, 2015
    Assignee: OFS FITEL, LLC
    Inventor: Ole A Levring
  • Patent number: 9029782
    Abstract: A chemical sensor is provided. The sensor includes at least one lightguiding element having an optical core. The lightguiding element comprises a layer of graphene situated in sufficient proximity to the core to exhibit evanescent wave absorption of optical energy in at least one optical mode guided in the core.
    Type: Grant
    Filed: October 17, 2012
    Date of Patent: May 12, 2015
    Assignee: LGS Innovations LLC
    Inventors: Ashok J. Maliakal, Brijesh Vyas, Hugo Safar
  • Patent number: 9031371
    Abstract: The present invention relates to a GI-type multi-mode optical fiber in which the outer diameter of the core is 47.5 to 52.5 ?m or 60 to 65 ?m, or to a bend resistant multi-mode optical fiber provided with resistance against property fluctuation caused by the bending of the multi-mode optical fiber by providing a trench portion having a low refractive index at the outer periphery of the core. In the multi-mode optical fiber, both the maximum tensile stress and the maximum compressive stress in the optical axis direction remaining in the core are 50 MPa or less.
    Type: Grant
    Filed: May 8, 2012
    Date of Patent: May 12, 2015
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Kazuhiro Yonezawa, Sumio Hoshino
  • Patent number: 9031372
    Abstract: A holey fiber includes: a core portion; an inner-cladding portion positioned at an outer periphery of the core portion, the inner-cladding portion having a plurality of inner holes formed in a layered structure around the core portion; and an outer-cladding portion positioned at an outer periphery of the inner-cladding portion, the outer-cladding portion having a plurality of outer holes formed in a layered structure around the inner-cladding portion. The inner holes are disposed to form a triangular lattice of which lattice constant ?1 is equal to or smaller than 2.0 ?m and to form equal to or greater than two layers. The outer holes are disposed to form a triangular lattice of which lattice constant ?2 is greater than the ?1 and equal to or larger than 3.0 ?m and to form equal to or greater than two layers. The overlap index is equal to or greater than 2.0%.
    Type: Grant
    Filed: March 10, 2014
    Date of Patent: May 12, 2015
    Assignee: Furukawa Electric Co,, Ltd.
    Inventor: Kazunori Mukasa
  • Patent number: 9031099
    Abstract: An optical active fiber is configured with an asymmetrically-shaped core having at least one long axis and a shortest axis which extends transversely to the long axis. The outmost cladding of the active fiber is configured with a marking indicating the orientation of the short axis. The marking allows for bending the fiber so that the shortest axis extends along and lies in the plane of the bend thereby minimizing distortion of a mode which is guided by the asymmetrically-shaped core as light propagates along the bend.
    Type: Grant
    Filed: April 19, 2013
    Date of Patent: May 12, 2015
    Assignee: IPG Photonics Corporation
    Inventors: Valentin I Gapontsev, Mikhail Vyatkin, Vladimir Sergueev, Dan Myasnikov, Ilya Zaytsev
  • Publication number: 20150117827
    Abstract: A graded refractive index bending-resistant multimode optical fiber includes a core layer and claddings. The core layer has a radius in a range of 22.5-27.5 ?m; refractive indexes being a gradient-graded refractive index distribution with a distribution exponent ? in a range of 1.99-2.06; and a maximum relative refractive index difference (RRID) ?1% max in a range of 0.9%-1.3%. The claddings has an inner cladding surrounding the core layer, an intermediate cladding surrounding the inner cladding and an outer cladding surrounding the inner cladding. The inner cladding has a radius in a range of 25.5-34.5 ?m, and an RRID ?2% in a range of ?0.02%-0.02%. The intermediate cladding is a pure quartz glass layer, and has a radius in a range of 30.5-49.5 ?m, and an RRID ?3% in a range of ?0.01%-0.01%. The outer cladding has a radius in a range of 61.5-63.5 ?m, and an RRID ?4% is in a range of ?0.20%-0.30%.
    Type: Application
    Filed: November 19, 2014
    Publication date: April 30, 2015
    Inventors: Song Wang, Zhipan Zhou, Yongtao Liu, Jin Xu, Mingfeng Fan, Shuqiang Zhang, Wei Wang
  • Publication number: 20150117826
    Abstract: The present teachings are generally directed to devices and methods for triplet photons generations, and in particular to on-chip integrated sources for generating direct triplet entangled photons.
    Type: Application
    Filed: October 31, 2014
    Publication date: April 30, 2015
    Inventors: Eric Mazur, Christopher Courtney Evans, Michael Gerhard Moebius, Orad Reshef, Sarah E. Griesse-Nascimento
  • Patent number: 9020316
    Abstract: An optical fiber is provided that includes a fiber configured to transmit optical data in a plurality of modes or in a single mode; a core region in the fiber that comprises fluorine-doped silica; and a cladding in the fiber that surrounds the core region and that comprises fluorine-doped silica. The core region has a graded refractive index profile with an alpha of about 0.5 to 5. The core of the fiber may be set with a radius of approximately 6 to 50 microns. The cladding may also comprise one or a plurality of layers, including trench or moat regions of a relatively lower refractive index. Still further, an inner cladding may be doped with fluorine at a concentration greater than that in the core region. An outer cladding can comprise silica with fluorine at a concentration below or equal to that in the inner cladding.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: April 28, 2015
    Assignee: Corning Incorporated
    Inventors: Dana Craig Bookbinder, Rostislav Radiyevich Khrapko, Ming-Jun Li, Pushkar Tandon
  • Publication number: 20150110452
    Abstract: High aspect ratio core optical fiber designs, which could be semi-guiding, including a core region having a first refractive index and a high aspect ratio elongated cross-section along a slow axis direction, are described. An internal cladding having a second refractive index sandwiches the core and acts as a fast-axis signal cladding. The core has an edge region at both of its short edges that is in contract with edge-cladding regions having a barbell shape. The refractive index of the core regions, the refractive index of the internal claddings, and the refractive index of the edge-cladding regions, are selected so as to maximize the optical power of a lowest-order mode propagating in the fiber core, and to minimize the optical power of the next-order modes in the fiber core. A process to fabricate such a high aspect ratio core fiber is also provided.
    Type: Application
    Filed: May 13, 2013
    Publication date: April 23, 2015
    Inventors: David J. Digiovanni, Dennis J. Trevor, David A. Rockwell, Vladimir Shkunov
  • Patent number: 9014523
    Abstract: A large mode field active optical fiber and manufacture method thereof is provided. The large mode field active optical fiber is formed by drawing a fiber core (1), a quartz glass internal cladding (2), a quartz glass outer cladding (3), and a coating (4). The quartz glass internal cladding (2), the quartz glass outer cladding (3), and the coating (4) are sequentially coated on the outer surface of the fiber core (1). The fiber core (1) is formed by depositing, melting, and shrinking the tetrachlorosilane doped with rare earth ions in a quartz glass tube. The refractive index of the fiber core (1) is a graded refractive index, and the section parameter a thereof is 1???3. The appearance of the quartz glass inner cladding (2) is regular multi-prism shaped.
    Type: Grant
    Filed: November 24, 2010
    Date of Patent: April 21, 2015
    Assignee: Fiberhome Telecommunications Technologies Co., Ltd.
    Inventors: Wei Chen, Shiyu Li, Daoyu Lei, Dongxiang Wang, Wenyong Luo, Wenjun Huang, Fuming Hu, Peng Hu
  • Patent number: 9014524
    Abstract: An optical waveguide having a cladding layer formed of high-purity glass, or a cladding layer formed of high-purity isotope-proportion modified glass, and with a core of high-purity isotope-proportion-modified glass with the index of refraction of the core glass greater than the index of refraction of the cladding glass, said high-purity isotope-proportion-modified core material having a Si-29-isotope proportion at most 4.447% Si-29 (atom/atom) of all silicon atoms in said core, or at least 4.90% of Si-29 (atom/atom) atoms in said core, or having a Ge-73 isotope proportion of at most 7.2% Ge-73 (atom/atom) of all germanium atoms in said core, or at least 8.18% of Ge-73 (atom/atom) of Germanium atoms in said core region.
    Type: Grant
    Filed: June 20, 2014
    Date of Patent: April 21, 2015
    Inventor: James Dalton Bell
  • Publication number: 20150104139
    Abstract: In one embodiment, an optical fiber includes a first layer having a first refractive index and a second layer surrounding the first layer, where the second layer has a second refractive index, an inner radius, and an outer radius. The optical fiber also includes a third layer surrounding the second layer, where the third layer has a third refractive index, where the first refractive index is less than the second refractive index, where the third refractive index is less than the second refractive index, and where a ratio of the outer radius to the inner radius is less than 1.5.
    Type: Application
    Filed: October 14, 2014
    Publication date: April 16, 2015
    Inventors: Charles Brunet, Leslie Rusch
  • Publication number: 20150104140
    Abstract: A graded refractive index bending-resistant multimode optical fiber includes a core layer and claddings. The core layer has a radius in a range of 20-50 ?m; refractive indexes being a gradient-graded refractive index distribution with a distribution exponent a in a range of 1.89-1.97; and a maximum relative refractive index difference (RRID) ?1% max in a range of 0.9%-2.72%. The claddings has an inner cladding surrounding the core layer, an intermediate cladding surrounding the inner cladding and an outer cladding surrounding the inner cladding. The inner cladding has a radius in a range of 22-57 ?m, and an RRID ?2% in a range of ?0.02%-0.02%. The intermediate cladding is a pure quartz glass layer, and has a radius in a range of 32-60 ?m, and an RRID ?3% in a range of ?0.01%-0.01%.
    Type: Application
    Filed: November 21, 2014
    Publication date: April 16, 2015
    Inventors: Song Wang, Zhipan Zhou, Yongtao Liu, Jin Xu, Mingfeng Fan, Shuqiang Zhang, Wei Wang
  • Publication number: 20150086161
    Abstract: An optical fiber link that utilizes concatenated primary and compensating multimode optical fibers is disclosed. The primary optical fiber has a first relative refractive index profile with a first alpha value ?40 of about 2.1 that provides for a minimum amount of intermodal dispersion of guided modes at a peak wavelength ?P40 in the range from 840 nm to 860 nm, and has a first bandwidth BW40 of 2 GHz·km or greater. The compensating optical fiber has a second relative refractive index profile with a second alpha value ?60, and wherein ?0.9?(?60??40)??0.1, and a peak wavelength ?P60 greater than 880 nm. The optical fiber link has improved bandwidth and data rates for first and second optical signals within first and second wavelength ranges, respectively.
    Type: Application
    Filed: September 17, 2014
    Publication date: March 26, 2015
    Inventors: Scott Robertson Bickham, Xin Chen, Ming-Jun Li, Dale Robert Powers
  • Patent number: 8977092
    Abstract: One exemplary multimode optical fiber includes a graded index glass core having a diameter in the range of 41 microns to 80 microns, a graded index having an alpha less than 2.04 and a maximum relative refractive index in the range between 0.6% and 1.8%. The cladding includes a depressed-index annular portion. The fiber has an overfilled bandwidth greater than 2.5 GHz-km at at least one wavelength between 1200 nm and 1700 nm.
    Type: Grant
    Filed: July 20, 2012
    Date of Patent: March 10, 2015
    Assignee: Corning Incorporated
    Inventors: Scott Robertson Bickham, Dana Craig Bookbinder, Ming-Jun Li, Pushkar Tandon
  • Patent number: 8977091
    Abstract: Multimode optical fiber systems with adjustable chromatic modal dispersion compensation are disclosed, wherein the system includes a VCSEL light source and primary and secondary optically coupled multimode optical fibers. Because the VCSEL light source has a wavelength spectrum that radially varies, its use with the primary multimode optical fiber creates chromatic modal dispersion that reduces bandwidth. The compensating multimode optical fiber is designed to have a difference in alpha parameter relative to the primary multimode optical fiber of ?0.1?????0.9. This serves to create a modal delay opposite to the chromatic modal dispersion. The compensation is achieved by using a select length of the compensating multimode optical fiber optically coupled to an output end of the primary multimode optical fiber. The compensating multimode optical fiber can be configured to be bend insensitive.
    Type: Grant
    Filed: September 21, 2012
    Date of Patent: March 10, 2015
    Assignee: Corning Incorporated
    Inventors: Xin Chen, Ming-Jun Li, Dale Robert Powers, Richard Stephen Vodhanel
  • Patent number: 8977093
    Abstract: The present invention relates to a multimode optical fiber having a structure for stably reducing eccentricity relative to an insert hole of a connector ferrule to be mounted at an end thereof, wherein a fiber outer diameter of the multimode optical fiber along its longitudinal direction varies periodically in a range of ±0.5 ?m with respect to a target fiber outer diameter.
    Type: Grant
    Filed: June 14, 2013
    Date of Patent: March 10, 2015
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Sumio Hoshino
  • Patent number: 8970947
    Abstract: Embodiments of auto-cladded optical fibers are described. The fibers may have a refractive index profile having a small relative refractive index change. For example, the fiber may include an auto-cladded structure having, e.g., a trough or gradient in the refractive index profile. A beam of light propagating in the fiber may be guided, at least in part, with the auto-cladded structure. In some embodiments, the optical fiber may be all glass. In some embodiments, the optical fiber may include a large-core or an ultra large-core.
    Type: Grant
    Filed: December 14, 2010
    Date of Patent: March 3, 2015
    Assignee: IMRA America, Inc.
    Inventors: Martin E. Fermann, Liang Dong, Libin Fu, Hugh A. McKay
  • Patent number: 8971683
    Abstract: A multimode optical fiber includes: (i) a graded index glass core having a radius R1 in the range of 20 microns to 50 microns, a maximum relative refractive index ?1MAX in the range between 0.5% and 3%; a graded index having a profile with (a) by an alpha (?) parameter wherein 1.9???2.2, and (b) a deviation from the alpha profile in at least one region of the core, such that the difference in the refractive index delta of the core from that determined by the core alpha value, at the radius R1 is less than 0.001, and (ii) a cladding surrounding and in contact with the core, wherein the fiber has an bandwidth greater than 5000 MHz-km at a wavelength ? where ??800 nm.
    Type: Grant
    Filed: October 23, 2013
    Date of Patent: March 3, 2015
    Assignee: Corning Incorporated
    Inventors: Xin Chen, Ming Jun Li, Dale Robert Powers
  • Patent number: RE45512
    Abstract: Apparatus and method are provided for transmitting at least one electro-magnetic radiation is provided. In particular, at least one optical fiber having at least one end extending along a first axis may be provided. Further, a light transmissive optical arrangement may be provided in optical cooperation with the optical fiber. The optical arrangement may have a first surface having a portion that is perpendicular to a second axis, and a second surface which includes a curved portion. The first axis can be provided at a particular angle that is more than 0° and less than 90° with respect to the second axis.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: May 12, 2015
    Assignee: The General Hospital Corporation
    Inventors: Guillermo J. Tearney, Milen Shishkov, Brett E. Bouma