Of Waveguide Core Patents (Class 385/142)
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Patent number: 7596292Abstract: A treatment method for an optical fiber including accommodating an optical fiber inside a treatment chamber; introducing a deuterium containing gas into the treatment chamber; and in a deuterium treatment step, exposing the optical fiber to atmosphere of the deuterium containing gas. In the deuterium treatment step, a deuterium concentration D in the treatment chamber during the deuterium treatment is calculated from an initial value A of a deuterium concentration in the deuterium containing gas inside the treatment chamber, a concentration B of oxygen in an ambient atmosphere of the treatment chamber, and a concentration C of oxygen in the deuterium containing gas inside the treatment chamber, and the deuterium concentration in the treatment chamber is controlled based on the deuterium concentration D calculated. Other gases such as hydrogen containing gas or nitrogen containing gas may also be used according to the invention.Type: GrantFiled: November 30, 2005Date of Patent: September 29, 2009Assignee: Fujikura Ltd.Inventors: Takahiro Hamada, Kenji Yamashiro, Munehisa Fujimaki, Koichi Harada, Yukinari Shirako, Hiroyuki Sawano, Shunichirou Hirafune
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Publication number: 20090232467Abstract: Disclosed herein is a printed circuit board for an optical waveguide, including a base board, and an optical waveguide formed on the base board. The optical waveguide includes a lower clad layer formed on the base board, an insulation layer formed on the lower clad layer and having a core-forming through-hole, a core part formed on a region of the lower clad layer, which is exposed through the through-hole, and an upper clad layer formed in the through-hole and on the insulation layer.Type: ApplicationFiled: June 9, 2008Publication date: September 17, 2009Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.Inventors: Joon Sung Kim, Sang Hoon Kim, Jae Hyun Jung, Han Seo Cho
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Patent number: 7590327Abstract: A waveguide based on a three-dimensional photonic crystal is arranged to provide wave-guiding in a single mode and a mode having a field strength distribution with unimodality in a plane perpendicular to the wave-guiding direction, to thereby enable wave-guiding in a desired frequency band, wherein the three-dimensional photonic crystal has a plurality of line defect members which include a first line defect member made of a medium having a refractive index not smaller than that of the columnar structures and formed in a direction perpendicular to the direction in which the columnar structures extend, and a second line defect member formed in the same direction as the first line defect member.Type: GrantFiled: August 22, 2007Date of Patent: September 15, 2009Assignee: Canon Kabushiki KaishaInventors: Kiyokatsu Ikemoto, Aihiko Numata
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Patent number: 7570864Abstract: The present invention relates to a polymeric composition of matter. The composition includes at least one polymer matrix and plurality of quantum dots distributed therein. The polymer may be a perfluorocyclobutane polymer having high optical transmission at telecommunications wavelengths. The quantum dots may include cap compounds to increase the solubility of the quantum dots in the composition. Typical cap compounds include aromatic organic molecules. Optical devices including waveguides may be fabricated from the polymeric compositions of the invention.Type: GrantFiled: September 26, 2008Date of Patent: August 4, 2009Assignee: Alcatel-Lucent USA Inc.Inventors: Gang Chen, Dan Fuchs, Ylva Olsson, Ronen Rapaport, Vikram Sundar
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Patent number: 7558461Abstract: An optical fiber comprising a core having a refractive index profile and a centerline; and a cladding layer surrounding and directly adjacent the core; wherein core includes updoping material and is doped with Aluminum in at least one region of the core, such that either: (a) the average longitudinal acoustic wave velocity within the core is within 0.05% of the longitudinal acoustic wave velocity within the cladding; or (b) the longitudinal acoustic wave velocity in the core changes by at least 0.2%.Type: GrantFiled: June 14, 2006Date of Patent: July 7, 2009Assignee: Corning IncorporatedInventors: Xin Chen, Stuart Gray, Ming-Jun Li, Daiping Ma, Daniel Aloysius Nolan, Alranzo Boh Ruffin, Donnell Thaddeus Walton, Ji Wang
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Patent number: 7551830Abstract: An impact resistant waveguide includes a clad surrounding a core. A reinforcing filler is incorporated in a curable silicone composition used to prepare the core, thereby imparting impact resistance to the core. A method of manufacture of the waveguide includes injecting the curable silicone composition into a clad made of silicone elastomeric tubing and thereafter curing the curable silicone composition.Type: GrantFiled: December 15, 2006Date of Patent: June 23, 2009Assignee: Dow Corning CorporationInventors: Jon Degroot, Steven Evans, Peter Lo, Udo Pernisz, Kai Su
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Patent number: 7551829Abstract: In a waveguide 10 including a substrate 1, a lower clad 2, an upper clad 3, and a core 4, the outline of a cross section perpendicular to the light propagating direction of the core 4 surrounded by the lower clad 2 has a shape curved with respect to the center of the cross section. The separation in the waveguide is thereby prevented, and the reliability of the optical property is enhanced.Type: GrantFiled: June 28, 2005Date of Patent: June 23, 2009Assignee: OMRON CorporationInventors: Akira Enami, Yoshihisa Ishida, Tamio Fujisaki, Hayami Hosokawa
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Patent number: 7547652Abstract: The invention relates to vitreous compositions, in particular of the vitroceramic type, transparent to infrared, production and uses thereof. Said compositions comprise in mol. %: Ge 5-40, Ga<1, S+Se 40-85, Sb+As 4-40, MX 2-25, Ln 0-6, adjuncts 0-30, where M=at least one alkaline metal, selected from Rb, Cs, Na, K and Zn, X=at least one atom of chlorine, bromine or iodine, Ln=at least one rare earth and adjunct=at least one additive comprising at least one metal and/or at least one metal salt with the sum of all molar percentages of the components present in said composition being 100.Type: GrantFiled: July 5, 2004Date of Patent: June 16, 2009Assignees: Centre National De La Recherche Scientifique, Universite Rennes 1Inventors: Xianghua Zhang, Jacques Lucas, Hongli Ma, Jean-Luc Adam
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Publication number: 20090136191Abstract: A magneto-optical structure is provided. The magneto-optical structure includes a substrate. A waveguide layer is formed on the substrate for guiding electromagnetic radiation received by the magneto-optical structure. The waveguide layer includes magnetic oxide material that comprises ABO3 perovskite doped with transition metal ions on the B site, or transition metal ions doped SnO2, or transition metal ions doped CeO2.Type: ApplicationFiled: October 31, 2008Publication date: May 28, 2009Inventors: Lei Bi, Gerald F. Dionne, Hyun Suk Kim, Caroline A. Ross
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Patent number: 7536076Abstract: Disclosed is an optical fiber having a silica-based core comprising an alkali metal oxide selected from the group consisting of K2O, Na2O, LiO2, Rb2O, Cs2O and mixtures thereof in an average concentration in said core between about 50 and 500 ppm by weight, said core further comprising chlorine and fluorine, wherein the average concentration of fluorine in said core is greater than the average concentration of alkali metal oxide in said core and the average concentration of chlorine in said core is greater than the average concentration of alkali metal oxide in said core; and a silica-based cladding surrounding and directly adjacent the core. By appropriately selecting the concentration of alkali metal oxide dopant in the core and the cladding, a low loss optical fiber may be obtained.Type: GrantFiled: May 10, 2007Date of Patent: May 19, 2009Assignee: Corning IncorporatedInventors: Rostislav Radievich Khrapko, Hazel B Matthews, III
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Patent number: 7532790Abstract: A method of making a microresonator device includes the steps of providing at least a first substrate and providing a waveguide integrated on the substrate. The waveguide includes a core and a metal cladding layer on at least part of one boundary of the core. Another step is positioning a microresonator so that it is in an optically coupling relationship with the waveguide.Type: GrantFiled: March 29, 2006Date of Patent: May 12, 2009Assignee: 3M Innovative Properties CompanyInventors: Terry L. Smith, Barry J. Koch, Michael A. Haase, Jun-Ying Zhang, Robert W. Wilson, Xudong Fan
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Publication number: 20090116809Abstract: The invention relates to lasers and fiber optics. An amplifying optical fiber operating at a wavelength in the range of 1000-1700 nm comprises an oxide glass core to provide amplification and at least one oxide glass cladding. According to the invention the core contains oxides of elements selected from the group consisting of silicon, germanium, phosphorus, bismuth, aluminum, gallium at concentration of bismuth oxide of 10-4-5 mol %, concentration of silicon and germanium oxides, taken together or separately, of 70-99.8999 mol %, concentration of aluminum and gallium oxides, taken together or separately, of 0.1-20 mol % concentration of phosphorus oxide from 0 to 10 mol %, and provides a maximum optical gain at least 10 times greater than the nonresonant loss factor in the optical fiber. An outside oxide glass cladding comprises fused silica.Type: ApplicationFiled: September 8, 2006Publication date: May 7, 2009Applicant: Fiber Optics Research Center of the Russian Academy of SciencesInventors: Evgeny Mikhailovich Dianov, Vladislav Vladimirovich Dvoirin, Valery Mikhailovich Mashinsky, Alexei Nikolaevich Guryanov, Andrei Alexandrovich Umnikov
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Patent number: 7529460Abstract: The present disclosure includes methods, devices, and systems having zinc oxide waveguides for optical signal interconnections. One optical signal interconnect system includes an oxide layer on a semiconductor substrate. A ZnO waveguide can be provided in the oxide layer and connected to a silicon detector to receive optical signals having a wavelength, for example, between 500 and 375 nanometers (nm).Type: GrantFiled: March 13, 2007Date of Patent: May 5, 2009Assignee: Micron Technology, Inc.Inventors: Leonard Forbes, Kie Y. Ahn
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Patent number: 7524780Abstract: A method of forming an alkali metal oxide-doped optical fiber by diffusing an alkali metal into a surface of a glass article is disclosed. The silica glass article may be in the form of a tube or a rod, or a collection of tubes or rods. The silica glass article containing the alkali metal, and impurities that may have been unintentionally diffused into the glass article, is etched to a depth sufficient to remove the impurities. The silica glass article may be further processed to form a complete optical fiber preform. The preform, when drawn into an optical fiber, exhibits a low attenuation.Type: GrantFiled: January 28, 2005Date of Patent: April 28, 2009Assignee: Corning IncorporatedInventors: Laura J. Ball, Bruno P. M. Baney, Dana C. Bookbinder, Keith L. House, Rostislav R. Khrapko, Lisa A. Moore, Susan L. Schiefelbein
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Patent number: 7526176Abstract: An optical amplifier including an optical waveguide layer (for example channel-shaped optical waveguide layer) including Pb1?xLax(ZryTi1?y)1?x/4O3(PLZT: 0<x<0.3, 0<y<1.0) doped with a rare earth element at an amount of 0.2 mol % to 11.0 mol %, the optical waveguide layer (for example channel-shaped optical waveguide layer) being formed as a single crystal film by solid-phase epitaxial growth.Type: GrantFiled: March 22, 2007Date of Patent: April 28, 2009Assignee: EpiPhotonics Corp.Inventors: Keiichi Nashimoto, Yoshiyuki Sugahara
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Patent number: 7526177Abstract: A single mode optical transmission fiber comprises a depressed core having at least 0.41 weight percent fluorine and an index difference (|?n1|) with pure silica greater than 1.5×10?3, a depressed cladding having at least 1.2 weight percent fluorine and an index difference (|?n2|) with pure silica greater than 4.5×10?3 and an index difference (|?n2|?|?n1|) with the depressed core greater than or equal to 3×10?3.Type: GrantFiled: July 3, 2007Date of Patent: April 28, 2009Assignee: Draka Comteq B.V.Inventors: Pieter Matthijsse, Frans Gooijer, Ivo Flammer, Elise Regnier, Gerard Kuyt
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Patent number: 7526160Abstract: Hydrogen-induced losses in germanium-doped fibers is significantly reduced by increasing the concentration of oxygen in the core region of the glass. The increase in oxygen functions to “heal” the germanium-deficient defects, thus substantially reducing the sites where hydrogen bonding can intrude. Advantageously, the presence of the excess oxygen does not compromise the ability to create UV-induced gratings in the fiber's core area. Indeed, the stability of the glass has been found to increase even further during UV radiation. Thus, an FBG structure suitable for use in harsh, high temperature environments can be formed.Type: GrantFiled: December 20, 2007Date of Patent: April 28, 2009Assignee: Baker Hughes IncorporatedInventors: Daniel Scott Homa, Justin Crusse
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Patent number: 7522803Abstract: The present invention provides a method of producing an optical element without the need for high vacuum, unlike the thin film deposition methods, and without using a molten salt. More specifically, the invention provides a method of producing an optical element comprising applying a paste containing at least one compound selected from lithium compounds, potassium compounds, rubidium compounds, cesium compounds, silver compounds, and thallium compounds, an organic resin, and an organic solvent to a glass substrate containing an alkali metal component as a glass component and then performing heat treatment at a temperature below the softening temperature of the glass substrate.Type: GrantFiled: February 15, 2005Date of Patent: April 21, 2009Assignees: Isuzu Glass Co., Ltd., National Institute of Advanced Industrial Science and TechnologyInventors: Tatsuya Suetsugu, Norimasa Kominami, Takeshi Ohtani, Naoko Kaga, Hiroaki Yokoi, Minoru Takada, Takashi Tarumi, Toshihiko Einishi, Kohei Kadono
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Fiber used in wideband amplified spontaneous emission light source and the method of making the same
Patent number: 7519262Abstract: The present invention relates to a fiber having a core of crystal fiber doped with chromium and a glass cladding. The fiber has a gain bandwidth of more than 300 nm including 1.3 mm to 1.6 mm in optical communication, and can be used as light source, optical amplifier and tunable laser when being applied for optical fiber communication. The present invention also relates to a method of making the fiber. First, a chromium doped crystal fiber is grown by laser-heated pedestal growth (LHPG). Then, the crystal fiber is cladded with a glass cladding by codrawing laser-heated pedestal growth (CDLHPG). Because it is a high temperature manufacture process, the cladding manufactured by this method is denser than that by evaporation technique, and can endure relative high damage threshold power for the pumping light.Type: GrantFiled: April 27, 2007Date of Patent: April 14, 2009Assignee: National Sun Yat-Sen UniversityInventors: Sheng-Lung Huang, Chia-Yao Lo, Kwang-Yao Huang, Shih-Yu Tu, Hsiao-Wen Lee, Sheng-Pan Huang, Sun-Bin Yin -
Patent number: 7515808Abstract: An apparatus comprising a planar optical waveguide having an optical core and optical cladding next to the optical core. The optical core or cladding includes a plurality of particles therein. Each particle has a nucleus and polymeric molecules permanently bonded to the nucleus to form a shell. A plurality of nuclei are dispersed in said core or cladding.Type: GrantFiled: June 1, 2007Date of Patent: April 7, 2009Assignee: Alcatel-Lucent USA Inc.Inventors: Christopher Richard Doerr, Ashok Maliakal
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Patent number: 7515809Abstract: A heat-resisting plastic optical fiber which excels in heat resistance and mass production and a manufacturing method thereof. The heat-resisting plastic optical fiber has a core which consists of transparent resin, and clad coated on the outer periphery of the core, which consists of the resin whose refractive index is lower than that of core. Precursor of material for the core material consists of the mixture of a group of monomers which contain polyfunctional monomer and transparent thermoplastic polymer.Type: GrantFiled: October 18, 2007Date of Patent: April 7, 2009Assignee: Hitachi Cable Ltd.Inventors: Seikichi Tanno, Tomiya Abe, Masanori Matsumoto
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Patent number: 7512299Abstract: Fiber optic cable systems and methods incorporating a luminescent compound-containing layer to identify cracks. Exemplary embodiments include a fiber optic cable apparatus including a core for receiving laser light emitted from a VCSEL for the detection of faults in the fiber optic cable, a cladding disposed around the core, the cladding having an index of retraction differential with the core thereby allowing containment of light within the core by total internal reflection within the core, a buffer disposed around the cladding, the buffer capable of receiving LED emitted light for the detection of faults in the fiber optic cable, a braiding layer disposed around the buffer and configured to allow LED light to transmit from the buffer, and a jacket disposed around the braiding layer, the jacket having optical properties to receive LED light transmitted down the buffer in response to VCSEL light having been unsuccessfully transmitted down the core.Type: GrantFiled: January 28, 2008Date of Patent: March 31, 2009Assignee: International Business Machines CorporationInventors: Jessica R. Berens, Lad W. Freitag, Joseph Kuczynski, Fraser A. Syme
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Patent number: 7507683Abstract: A glass-ceramic material, particularly for elements in laser systems, and a method for preparing same. The glass-ceramic material may be used for an optical fiber for communication systems and laser systems. The glass-ceramic may include gahnite crystals and optionally ?-quartz-like solid solution, or a petalite-like crystals, spinel, and zirconia crystals. The elements may comprise a host material glass-ceramic, where the glass-ceramic is doped with appropriate ions.Type: GrantFiled: September 21, 2007Date of Patent: March 24, 2009Assignee: Elop Electro-Optics Industries Ltd.Inventors: Marina Sirota, Ehud Galun, Adrian Goldshtein, Alla Buch, Vladimir Krupkin, Rami Cohen, Alexander Glushko, Elena Luria
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Publication number: 20090074347Abstract: A method of fiber core material band gap engineering for artificially modifying fiber material properties is provided. The method includes doping the fiber core material with one or more atoms for enhancing photosensitivity to the fiber material. The method also includes co-doping the fiber core material with one or more ions for enhancing an amorphous network crosslink mean coordination number. The method further includes thermally annealing the fiber core material for widening the band gap of the fiber core material.Type: ApplicationFiled: September 14, 2007Publication date: March 19, 2009Applicant: GENERAL ELECTRIC COMPANYInventors: Hua Xia, Kevin Thomas McCarthy, Kung-Li Justin Deng, Fulton Jose Lopez, Aaron John Avagliano
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Publication number: 20090074351Abstract: An optical fiber, and an optical access network, a local area network and optical parts for communication, which uses the optical fiber, are disclosed. The optical fiber whose core diameter is 10 ?m˜40 ?m has at least two propagation modes in a wavelength over 1200 nm. The optical fiber according to the present invention can reduce packaging costs for optical components, since cross-sectional area of the core is large, compared with the prior art technique adopting a single mode optical fiber, and can transmit ultra-high speed data a relatively long distance, since the mode number and modal dispersion effect of the optical fiber is relatively small, compared with the prior art multimode optical fiber. Also, when using the optical fiber according to the present invention, the optical subscriber network and the local area network can be cost-effectively implemented.Type: ApplicationFiled: September 23, 2005Publication date: March 19, 2009Applicant: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGYInventors: Yun Chur Chung, Jun Haeng Lee, Eui Seung Son, Jang Won Chae
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Publication number: 20090074374Abstract: A curable composition for an optical material including a specific silicon-containing polymer (A), a specific epoxy resin (B) and an energy ray-sensitive cationic polymerization initiator (C) as essential components.Type: ApplicationFiled: March 7, 2007Publication date: March 19, 2009Inventors: Naofumi Fujiue, Kenji Hara, Yoshihiro Ishikawa, Yoshikazu Shoji
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Patent number: 7505667Abstract: A waveguide configuration comprising a core, a first cladding, a second cladding, and a buffer. The core includes an index of refraction and an acoustic shear velocity. The first cladding extends about the core and has an acoustic shear velocity which is less than that of the core and an index of refraction which is less than the core. The second cladding extends about the first cladding. The second cladding has an acoustic shear velocity which is greater than that of the first cladding and less than the acoustic shear velocity of the core. The second cladding has an index of refraction which is less than that of an optical mode. The buffer extends about the second cladding.Type: GrantFiled: July 16, 2008Date of Patent: March 17, 2009Inventor: Peter Dragic
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Publication number: 20090067792Abstract: Step-index optical waveguides are made of multicomponent glass containing a core glass and an outer glass which entirely surrounds the core class. A fiber-optic cable for conducting electromagnetic radiation, contains at least one bundle of individual fibers which encompass the step-index optical waveguides that are made of multicomponent glass containing a core glass and an outer glass that entirely surrounds the core glass on the circumferential wall thereof. These step-index optical waveguides provide great transmission capacity for transmitting data while keeping the transfer characteristics sufficiently durable. Furthermore, the fiber-optic cable is resistant against physical and chemical environmental influences and be protected against radical ambient chemicals.Type: ApplicationFiled: September 15, 2008Publication date: March 12, 2009Applicant: Schott AGInventors: Axel Curdt, Lothar Willmes, Wolfgang Eis, Markus Kappel, Thomas Weingartner, Thomas Henrich, Wolfram Gehenn, Uwe Kolberg
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Publication number: 20090062421Abstract: The present invention relates to a phenoxy resin for an optical material obtained by subjecting at least one selected from specific difunctional epoxy resins and at least one selected from specific difunctional phenols to polyaddition reaction, wherein a film comprising the above phenoxy resin has a refractive index of 1.580 or less at 25° C. and a wavelength of 830 nm, a resin composition for an optical material containing the above phenoxy resin, a resin film for an optical material comprising the above resin composition and an optical waveguide produced by using the above resin composition and/or the above resin film.Type: ApplicationFiled: March 15, 2007Publication date: March 5, 2009Applicant: HITACHI CHEIMICAL COMPANY LTD.Inventors: Tatsuya Makino, Atsushi Takahashi, Toshihiko Takasaki, Tomoaki Shibata, Masami Ochiai
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Patent number: 7493009Abstract: The present invention concerns an optical fiber 10 comprising a substantially pure silica glass core 12, a concentric tin-doped core/cladding interface region 14, and a concentric fluorine-doped depressed cladding layer 16. The tin-doped core/cladding interface region 14 comprises a low concentration gradient of tin dioxide, which advantageously results in a de minimis refractive index change, resistance to hydrogen incursion, and thermal stability of any fiber Bragg gratings written into the interface region 14.Type: GrantFiled: May 25, 2007Date of Patent: February 17, 2009Assignee: Baker Hughes IncorporatedInventor: Daniel S. Homa
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Patent number: 7493008Abstract: A tellurite glass composition doped with a first lanthanide, preferably Tm, and codoped with another lanthanide oxide, e.g. Ho, is provided. The glass includes 4-12 mole % of alkalihalide XY, X being selected from the group of Li, Na, K, Rb, Cs and Fr and Y being selected from the group of F, Cl, Br and I. A preferred glass contains about 10 mole % of the alkalihalide CsCl. The addition of alkalihalide XY results in an enhanced energy transfer from the first to the second lanthanide ion, whereby the lower energy level of the first lanthanide ion is depopulated. The ratio between upper and lower energy level lifetimes for the first lanthanide ion can be reduced to a value below one, enabling efficient amplifier fibers.Type: GrantFiled: March 11, 2004Date of Patent: February 17, 2009Assignee: Ericsson Telecommicacoes S.A.Inventors: Luiz Carlos Barbosa, Carlos Lenz Cesar
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Patent number: 7489850Abstract: Disclosed is an optical fiber having a silica-based core and a silica-based cladding, the core comprising germania, and oxides of an alkali metal and phosphorous. By appropriately selecting the concentration of alkali metal and phosphorous oxides, fibers exhibiting low attenuation and low hydrogen aged attenuation may be obtained. In a preferred embodiment, the alkali metal oxide is potassium oxide (K2O).Type: GrantFiled: October 30, 2007Date of Patent: February 10, 2009Assignee: Corning IncorporatedInventor: George Edward Berkey
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Publication number: 20090022461Abstract: An optical fiber which reduces transmission loss increase even in a high humidity environment or under water is provided. To solve the above issue, an optical fiber according to the present invention comprises a glass optical fiber coated with at least two coating layers, soft and hard layers. The optical fiber is further coated by a colored resin to make a colored optical fiber. The hard layer and the color layer of the colored optical fiber have a free volume radius of at least 0.290 nm according to positron annihilation lifetime spectroscopy.Type: ApplicationFiled: September 22, 2008Publication date: January 22, 2009Applicant: THE FURUKAWA ELECTRIC CO., LTD.Inventors: Yasuo NAKAJIMA, Kouji Mochizuki, Hiroki Tanaka
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Patent number: 7471863Abstract: A near-field interaction control element includes a near-field optical waveguide containing particles formed of a metal, a metal anion or a metal cation with a diameter of 0.5 nm or more and 3 nm or less and a dielectric constant of ?2.5 or more and ?1.5 or less, an electron injector/discharger injecting or discharging an electron into or from the particles contained in the near-field optical waveguide to vary a dielectric constant of the near-field optical waveguide, a near-field light introducing part introducing near-field light into the near-field optical waveguide, and a near-field light emitting part emitting the near-field light having guided through the near-field optical waveguide.Type: GrantFiled: March 26, 2007Date of Patent: December 30, 2008Assignee: Kabushiki Kaisha ToshibaInventors: Kenji Todori, Miho Maruyama, Reiko Yoshimura, Fumihiko Aiga, Tsukasa Tada, Ko Yamada
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Publication number: 20080316766Abstract: A waveguide based on a three-dimensional photonic crystal is arranged to provide wave-guiding in a single mode and a mode having a field strength distribution with unimodality in a plane perpendicular to the wave-guiding direction, to thereby enable wave-guiding in a desired frequency band, wherein the three-dimensional photonic crystal has a plurality of line defect members which include a first line defect member made of a medium having a refractive index not smaller than that of the columnar structures and formed in a direction perpendicular to the direction in which the columnar structures extend, and a second line defect member formed in the same direction as the first line defect member.Type: ApplicationFiled: August 22, 2007Publication date: December 25, 2008Applicant: CANON KABUSHIKI KAISHAInventors: Kiyokatsu Ikemoto, Aihiko Numata
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Patent number: 7454112Abstract: Apparatus including: a substrate layer having a substantially planar top surface; an optically conductive peak located and elongated on, and spanning a first thickness measured in a direction generally away from, the top surface; the optically conductive peak having first and second lateral walls each including distal and proximal lateral wall portions, the proximal lateral wall portions intersecting the top surface; and first and second sidewall layers located on the distal lateral wall portions, the sidewall layers not intersecting the top surface and spanning a second thickness that is less than the first thickness measured in the same direction.Type: GrantFiled: March 31, 2006Date of Patent: November 18, 2008Assignee: Lucent Technologies Inc.Inventors: Young-Kai Chen, Andreas Bertold Leven, Yang Yang
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Patent number: 7450813Abstract: Various embodiments described herein include rare earth doped glass compositions that may be used in optical fiber and rods having large core sizes. Such optical fibers and rods may be employed in fiber lasers and amplifiers. The index of refraction of the glass may be substantially uniform and may be close to that of silica in some embodiments. Possible advantages to such features include reduction of formation of additional waveguides within the core, which becomes increasingly a problem with larger core sizes.Type: GrantFiled: March 29, 2007Date of Patent: November 11, 2008Assignee: IMRA America, Inc.Inventors: Liang Dong, Xiang Peng
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Patent number: 7444058Abstract: This invention is a resin composition for optical wiring, comprising an inorganic filler with an average particle size of 1 nm to 100 nm and a resin, having a ratio nf/nr (where nf is the refractive index of the inorganic filler and nr is the refractive index of the resin) of 0.8 to 1.2, a thermal expansion coefficient of ?1×10?5 /° C. to 4×10?5/° C., and a true dependency value of its refractive index on the temperature of ?1×10?4/° C. to 1×10?4/° C. in a temperature range from ?20° C. to 90° C., and substantially incapable of absorbing light in a wavelength range from 0.6 to 0.9 ?m or from 1.2 to 1.6 ?m. This invention also provides an optoelectronic circuit board.Type: GrantFiled: March 5, 2007Date of Patent: October 28, 2008Assignee: Toray Industries, Inc.Inventors: Toshihisa Nonaka, Noboru Asahi, Yoshiko Tatsuta
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Patent number: 7440671Abstract: Materials transparent to terahertz waves are very limited, and it is difficult to obtain the required performance by selecting the material. Further, it is also difficult to search for a novel material. Therefore, by letting a known material transparent to terahertz waves have a photonic crystal structure and controlling the structure, an optical waveguide having the required properties is provided. An optical waveguide for propagation of far-infrared radiation in the terahertz region, which optical waveguide is made of a fluorinated amorphous polymer. Particularly preferred is a polymer having a fluorinated aliphatic ring structure in its main chain, obtained by cyclopolymerization of a fluorinated monomer having at least two polymerizable double bonds.Type: GrantFiled: May 18, 2007Date of Patent: October 21, 2008Assignee: Asahi Glass Company, LimitedInventors: Nobuhiko Sarukura, Ko Aosaki, Hideki Sato, Yoshihiko Sakane
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Patent number: 7440673Abstract: A radiation resistant single-mode optical fiber has a core and a cladding, each made of fluorine-doped silica glass, in which a chlorine concentration of the core is at least 0.01 ppm, a relative refractive index difference of the core based on the refractive index for silica is between ?0.30% and ?0.10%, a relative refractive index difference of the core based on the refractive index for the cladding is between 0.3% and 0.5%, a cutoff wavelength is 1.27 ?m or below, and a bending loss at a wavelength of 1.3 ?m and a bending diameter of 20 mm is 0.5 dB/m or less.Type: GrantFiled: April 12, 2007Date of Patent: October 21, 2008Assignee: Fujikura Ltd.Inventors: Kazuhiko Aikawa, Katsuaki Izoe, Naoki Shamoto, Manabu Kudoh, Takashi Tsumanuma
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Patent number: 7440672Abstract: The present invention relates to an optical fiber for an optical amplifier and a method for manufacturing the same, which can be applied to an optical transmission system in the S-band area (4130 nm-1530 nm). According to the present invention, silica is used as a base material and the optical fiber for an optical amplifier contains Tm3+ ions and metal ions in a first core layer formed on an inner surface of a second core layer using the MCVD (Modified Chemical Vapor Deposition) method and a solution doping method whereby the practicability and productivity of the optical fiber are remarkably improved.Type: GrantFiled: May 13, 2003Date of Patent: October 21, 2008Assignee: LG Cable Ltd.Inventors: Young-beom Seo, Jae-hong Lim, Dae-weon Kim
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Patent number: 7437047Abstract: Photosensitive optical materials are used for establishing more versatile approaches for optical device formation. In some embodiments, unpatterned light is used to shift the index-of-refraction of planar optical structures to shift the index-of-refraction of the photosensitive material to a desired value. This approach can be effective to produce cladding material with a selected index-of-refraction. In additional embodiments gradients in index-of-refraction are formed using photosensitive materials. In further embodiments, the photosensitive materials are patterned within the planar optical structure. Irradiation of the photosensitive material can selectively shift the index-of-refraction of the patterned photosensitive material. By patterning the light used to irradiate the patterned photosensitive material, different optical devices can be selectively activated within the optical structure.Type: GrantFiled: April 30, 2007Date of Patent: October 14, 2008Assignee: NeoPhotonics CorporationInventors: Michael A. Bryan, Nobuyuki Kambe
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Patent number: 7433572Abstract: This invention pertains to optical fiber transmission networks, and is particularly relevant to transmission of high volume of data and voice traffic among different locations. In particular, the improvement teaches improvements to an optical transport system to allow for efficient and flexible network evolution.Type: GrantFiled: July 31, 2006Date of Patent: October 7, 2008Assignee: Pivotal Decisions LLCInventor: Marvin R. Young
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Publication number: 20080240667Abstract: This invention relates to a coating material that is applied on organic and/or inorganic surfaces and that can detain moisture and easily release the moisture that is detained after a certain time, and a fiber optic sensor (1) where this coating is utilized.Type: ApplicationFiled: July 19, 2005Publication date: October 2, 2008Inventors: Halime Usta Yogun, Yavuz Ercil, Yusuf Menceloglu, Naci Inci
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Patent number: 7429369Abstract: A relatively thick electrode is positioned opposite the surface of a substrate/second electrode. The electrode and the substrate surface are both contacted by a solution including silicon nanoparticles. The substrate surface is completely immersed in the solution in a manner such that there is not an air/solution interface and there is no meniscus at the substrate surface. Application of electrical potential between the electrode and the substrate creates a film of silicon nanoparticles on the substrate. Drying of the film induces the film to roll up and form a silicon nanoparticle nanotube material. A film may be subdivided into an array of identical portions, and the identical portions will roll into identical tubes having same length and diameter. A silicon nanoparticle nanotube material of the invention includes nanotubes formed of silicon nanoparticles.Type: GrantFiled: June 9, 2004Date of Patent: September 30, 2008Assignee: The Board of Trustees of the University of IllinoisInventors: Munir H. Nayfeh, Sahraoui Chaieb
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Patent number: 7429138Abstract: A plastic optical fiber (11) has a core (12) and a clad (13). The clad (13) is composed of an outer clad (14) and an inner clad (15). The refractive index in the core (12) gradually increases as the distance from the center thereof decreases. The refractive index in the inner clad (15) is equal to the minimum value of the refractive index in the core (12), and the refractive index in the outer clad (14) is smaller than that in the inner clad (15). For the purpose of decreasing the transmission loss between the plastic optical fiber (11) and a light emission device or the light receiving device, the diameter d1 of the core (12) and the outer diameter d2 of the inner clad (15) satisfy the following conditions; 100(?m)?d1?700(?m) 200(?m)?d1?1000(?m) d1<d2.Type: GrantFiled: August 19, 2005Date of Patent: September 30, 2008Assignee: FUJIFILM CorporationInventors: Yoshisada Nakamura, Hiroki Takahashi, Takanori Sato, Kenji Matsumoto, Hiroyuki Hiiro
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Publication number: 20080232761Abstract: The invention relates to methods of making optical waveguide structures by way of molecular beam epitaxy (MBE). The method comprises the steps of: (1) providing a single crystal substrate in an ultra-high vacuum (UHV) environment, wherein the single crystal substrate has a first index of refraction; (2) heating the single crystal substrate; (3) depositing an epitaxial oxide layer having a rare-earth dopant and a second index of refraction on the single crystal substrate, wherein the epitaxial oxide layer is deposited by way of at least first, second, and third molecular beam fluxes; and (4) depositing a cladding layer on the single crystal oxide layer, wherein the cladding layer has a third index of refraction that is the same or about the same as the first index of refraction of the single crystal substrate, and wherein the second index of refraction is greater than the first and third indexes of refraction.Type: ApplicationFiled: September 20, 2007Publication date: September 25, 2008Inventors: Raveen Kumaran, Shawn Penson, Ivan-Christophe Robin, Thomas Tiedje
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Patent number: 7418187Abstract: A waveguide configuration comprising a core, a first cladding, a second cladding, and a buffer. The core includes an index of refraction and an acoustic shear velocity. The first cladding extends about the core and has an acoustic shear velocity which is less than that of the core and an index of refraction which is less than the core. The second cladding extends about the first cladding. The second cladding has an acoustic shear velocity which is greater than that of the first cladding and less than the acoustic shear velocity of the core. The second cladding has an index of refraction which is less than that of an optical mode. The buffer extends about the second cladding.Type: GrantFiled: April 24, 2007Date of Patent: August 26, 2008Inventor: Peter Dragic
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Patent number: 7412142Abstract: An optical fiber comprising: (i) a silica based passive core having a first index of refraction n1; (ii) a silica based cladding surrounding the core and having a second index of refraction n2, such that n1>n2, said cladding having at least one stress rod and at least one air hole extending longitudinally through the length of said optical fiber; and (iii) wherein said optical fiber supports a single polarization mode or poses polarization maintaining properties within the operating wavelength range.Type: GrantFiled: May 19, 2006Date of Patent: August 12, 2008Assignee: Corning IncorporatedInventors: Xin Chen, Joohyun Koh, Ming-Jun Li, Daniel Aloysius Nolan
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Patent number: 7406235Abstract: A graded-index multimode fiber includes a core made of silica glass, the core having a central region and an outer peripheral region, and a cladding which is provided at an outer periphery of the core. The central region contains one of germanium and phosphorus, and the outer peripheral region contains fluorine.Type: GrantFiled: September 7, 2004Date of Patent: July 29, 2008Assignee: Fujikura Ltd.Inventors: Ning Guan, Katsuhiro Takenaga, Kuniharu Himeno