With Graded Index Core Or Cladding Patents (Class 385/124)
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Publication number: 20120008907Abstract: The present invention provides an optical fiber which can have a larger NA and a preferable mechanical strength even with a monolayer coating and can be fabricated at low cost, and which can transmit excitation light efficiently reducing a loss even under a high temperature environment during the operation of a fiber laser. An optical fiber according to an embodiment of the present invention includes a core, a glass cladding which is provided at a periphery of the core and has a refractive index smaller than the core, and a polymer cladding which is provided at a periphery of the glass cladding and has a refractive index smaller than the glass cladding. The polymer cladding contains fluorine and the polymer cladding has a difference between an elasticity modulus at 60° C. and that at 23° C. equal to or smaller than 100 MPa and also has an elasticity modulus equal to or larger than 200 MPa at 23° C.Type: ApplicationFiled: June 8, 2011Publication date: January 12, 2012Applicant: FURUKAWA ELECTRIC CO., LTD.Inventors: Masanobu NAKAMURA, Yoshihiro Arashitani
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Patent number: 8094983Abstract: An optical fiber includes a cladding, a first core, and a second core. At least one of the first core and the second core is hollow and is substantially surrounded by the cladding. At least a portion of the first core is generally parallel to and spaced from at least a portion of the second core. The optical fiber includes a defect substantially surrounded by the cladding, the defect increasing a coupling coefficient between the first core and the second core.Type: GrantFiled: November 8, 2010Date of Patent: January 10, 2012Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Vinayak Dangui, Michel J. F. Digonnet, Gordon S. Kino
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Patent number: 8094986Abstract: A double clad fiber includes a core, a first cladding provided so as to cover the core, and a second cladding provided so as to cover the first cladding. The second cladding has a plurality of pores extending in a length direction and arranged so as to surround the first cladding. In at least one fiber end, the second cladding has been removed by mechanical processing so that the at least one fiber end is formed by the core and the first cladding.Type: GrantFiled: November 14, 2008Date of Patent: January 10, 2012Assignee: Mitsubishi Cable Industries, Ltd.Inventors: Masatoshi Tanaka, Tetsuya Yamamoto
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Patent number: 8090233Abstract: The present invention is directed to the creation of optical waveguiding devices from standard optical fibers by the creation of zones of permanently altered refractive index characteristics therein. A high intensity femtosecond laser beam is focused at a predetermined target region in the fiber so as to soften the glass material at the target region. After aligning the focal region with the target region in the fiber there will be relative movement between the focal region and the fiber, which has the effect of sweeping the focal region across the fiber in a predetermined path, so as to create a secondary waveguide path. A portion of the light traveling along the core is removed from the core along the secondary waveguide path such that the device can be utilized as an attenuator, an optical tap, or a polarimeter.Type: GrantFiled: November 30, 2009Date of Patent: January 3, 2012Assignees: OZ Optics Ltd, Femtonics CorporationInventors: Omur M. Sezerman, Kenneth O. Hill, Garland Best, Dwayne R. J. Miller, Michael Armstrong, Shujie Lin
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Patent number: 8081856Abstract: Provided is an optical fiber that has a small bending loss, can be securely prevented from being fractured due to accidental bending during installation or other operations, and is compliant with the G. 652 standard. An optical fiber 1 includes a core 11, a first cladding 12, a second cladding 13, and a third cladding 14. The relative refractive index difference ?1 of the core 11 is in the range of 0.3% to 0.38%, the relative refractive index difference ?2 of the first cladding 12 is equal to or smaller than 0%, and the relative refractive index difference ?3 of the second cladding 13 is in the range of ?1.8% to ?0.5%. The inner radius r2 and the outer radius r3 of the second cladding 13 satisfy the expression “0.4r2+10.5<r3<0.2r2+16”, and the inner radius r2 of the second cladding 13 is equal to or greater than 8 ?m. The bending loss at a wavelength of 1550 nm and at a radius of curvature of 7.5 mm is smaller than 0.Type: GrantFiled: May 23, 2011Date of Patent: December 20, 2011Assignee: Sumitomo Electric Industries, Ltd.Inventors: Tetsuya Nakanishi, Fumiaki Satou, Katsuyuki Aihara, Hiroshi Miyano, Takashi Sasaki
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Patent number: 8081854Abstract: Disclosed is a low bend loss optical fiber including: a core; an inner layer disposed at outside of the core, which has a refractive index lower than a refractive index of the core, the refractive index of the inner layer gradually decreasing as it becomes farther from the core; and a trench layer disposed at outside of the inner layer, which has a lowest refractive index.Type: GrantFiled: December 15, 2009Date of Patent: December 20, 2011Assignees: SEHF-Korea Co., Ltd., Gwangju Institute of Science and TechnologyInventors: Young-Sik Yoon, Yeong-Seop Lee, Jin-Han Kim, Won-Taek Han, Seong-Min Joo, Dea-Hwan Oh
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Patent number: 8081855Abstract: Provided is an optical fiber that has a small bending loss, can be securely prevented from being fractured due to accidental bending during installation or other operations, and is compliant with the G. 652 standard. An optical fiber 1 includes a core 11, a first cladding 12, a second cladding 13, and a third cladding 14. The relative refractive index difference ?1 of the core 11 is in the range of 0.3% to 0.38%, the relative refractive index difference ?2 of the first cladding 12 is equal to or smaller than 0%, and the relative refractive index difference ?3 of the second cladding 13 is in the range of ?1.8% to ?0.5%. The inner radius r2 and the outer radius r3 of the second cladding 13 satisfy the expression “0.4r2+10.5<r3<0.2r2+16”, and the inner radius r2 of the second cladding 13 is equal to or greater than 8 ?m. The bending loss at a wavelength of 1550 nm and at a radius of curvature of 7.5 mm is smaller than 0.Type: GrantFiled: February 20, 2009Date of Patent: December 20, 2011Assignee: Sumitomo Electric Industries, Ltd.Inventors: Tetsuya Nakanishi, Fumiaki Satou, Katsuyuki Aihara, Hiroshi Miyano, Takashi Sasaki
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Publication number: 20110305423Abstract: A multimode optical fiber comprises a central core having an alpha profile, a depressed cladding having a portion in continuity with the alpha profile of the central core and a stepped portion, and an outer cladding. The alpha profile is obtained by co-doping at least two dopants. A multimode fiber for Ethernet optical system with an improved bandwidth is thus obtained.Type: ApplicationFiled: August 25, 2011Publication date: December 15, 2011Applicant: Draka Comteq B.V.Inventors: Denis Molin, Yves Lumineau, Pierre Sillard, Ralph Petrus Johannes Adrianus Van Lankveld, Koen de Jongh
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Patent number: 8078026Abstract: Since the magnitude of a nonlinear effect depends on the nonlinearity coefficient of the microstructured fiber and the intensity of pump light, either the nonlinearity coefficient or the intensity of pump light are adjusted. The nonlinearity coefficient is modified by introducing a nonlinear refractive index profile that has the inverse characteristic of the intensity distribution of either the pump or the signal light. The intensity of the pump light is adjusted by an optical amplifier, an optical attenuator, or a pre-emphasizing filter under the control of a control unit. The control unit controls the intensity of the pump light based on a look-up table which is prepared in advance by experiment or calculation, or based on a function of the pump and signal wavelength.Type: GrantFiled: November 30, 2004Date of Patent: December 13, 2011Assignee: Fujitsu LimitedInventors: Rainer Hainberger, Shigeki Watanabe
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Patent number: 8073300Abstract: An arrangement comprising a fiber-optic waveguide (10) and a detection device (25), wherein the fiber-optic waveguide (10) comprises a core region (10E) and a cladding region (10C) surrounding the core region (10E), wherein the core region has a higher refractive index than the cladding region, and wherein the detection device (25) can detect damage to the fiber-optic waveguide (10).Type: GrantFiled: June 15, 2007Date of Patent: December 6, 2011Assignee: OSRAM Opto Semiconductors GmbHInventors: Volker Härle, Alfred Lell, Hubert Ott, Norbert Stath, Uwe Strauss
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Patent number: 8073299Abstract: A method for fabricating composite materials/devices comprising stacking together fibers or rods of at least two different materials and drawing the fibers or rods. Using this process, devices having nanoscale features can be readily fabricated.Type: GrantFiled: May 31, 2007Date of Patent: December 6, 2011Assignee: Herlot-Watt UniversityInventors: Mohammad Reza Taghizadeh, Ryszard Buczynski
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Publication number: 20110293232Abstract: A hydrogen-resistant optical fiber particularly well-suitable for downhole applications comprises a relatively thick pure silica core and a depressed-index cladding layer. Interposed between the depressed-index cladding layer and the core is a relatively thin germanium-doped interface. By maintaining a proper relationship between the pure silica core diameter and the thickness of the germanium-doped interface, a majority (preferably, more than 65%) of the propagating signal can be confined within the pure silica core and, therefore, be protected from hydrogen-induced attenuation problems associated with the presence of germanium (as is common in downhole fiber applications). The hydrogen-resistant fiber of the present invention can be formed to include one or more Bragg gratings within the germanium-doped interface, useful for sensing applications.Type: ApplicationFiled: May 25, 2007Publication date: December 1, 2011Inventors: Daniel Scott Homa, Brooks Childers
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Publication number: 20110286710Abstract: An optical transmission fiber comprises a central core having an index difference ?n1 with an outer optical cladding; a first inner cladding having an index difference ?n2 with the outer cladding; and a second buried inner cladding having an index difference ?n3 with the outer cladding of less than ?3.10?3. The second buried inner cladding moreover contains Germanium in a weight concentration of between 0.5% and 7%. The fiber shows reduced bending and microbending losses whilst exhibiting the optical performances of a standard single-mode fiber (SSMF).Type: ApplicationFiled: August 3, 2011Publication date: November 24, 2011Applicant: DRAKA COMTEQ B.V.Inventors: Louis-Anne de Montmorillon, Pieter Matthijsse, Pascale Nouchi, Denis Molin, Marianne Bigot-Astruc, Pierre Sillard, Frans Gooijer, Ivo Flammer, Yves Lumineau
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Publication number: 20110274398Abstract: A multicore fiber comprises a plurality of cores extending along the length of a fiber body. Each of the cores is surrounded by a cladding. The plurality of cores and surrounding cladding provide respective index variations, so as to form a respective plurality of waveguides for conducting parallel data transmissions from a first end of the fiber to a second end. The plurality of cores has a cross-sectional geometry in which the plurality of cores is configured in a polygonal array, in which at least some of the cores are positioned at the vertices of the array. The polygonal array is configured such that neighboring cores in the array are separated from each other by a distance that is sufficient to prevent crosstalk therebetween.Type: ApplicationFiled: March 10, 2011Publication date: November 10, 2011Applicant: OFS FITEL, LLCInventors: John M. Fini, Thierry F. Taunay, Man F. Yan, Benyuan Zhu
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Patent number: 8055110Abstract: Microstructured optical fiber for single-moded transmission of optical signals, the optical fiber including a core region and a cladding region, the cladding region including an annular hole-containing region that contains non-periodically disposed holes. The annular hole containing region is doped with at least one dopant selected from fluorine and chlorine. The optical fiber provides low bend loss as well as low heat-induced splice loss.Type: GrantFiled: November 3, 2009Date of Patent: November 8, 2011Assignee: Corning IncorporatedInventors: Jeffrey Coon, Lisa Larae Hepburn, Ming-Jun Li, Kevin Bryan Sparks
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Patent number: 8055111Abstract: A dispersion-shifted optical fiber (NZDSF) includes a central core (r1, Dn1), an inner cladding having at least three zones with a first intermediate cladding zone (r2, Dn2), a second ring zone (r3, Dn3) and a third buried trench zone (Wtr, Dnt). The buried trench zone has an index difference (Dnt) with the optical cladding between ?5·10?3 and ?15·10?3 and has a width (Wtr) between 2.5 ?m and 5.5 ?m. The present optical fiber, at a wavelength of 1550 nm, has reduced Rayleigh scattering losses of less than 0.164 dB/km, with limited bending losses.Type: GrantFiled: April 3, 2009Date of Patent: November 8, 2011Assignee: Draka Comteq, B.V.Inventors: Pierre Sillard, Elise Regnier, Marianne Bigot-Astruc, Denis Molin, Louis-Anne de Montmorillon, Simon Richard
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Publication number: 20110267612Abstract: An optical fibre is provided having a fibre cladding around a longitudinally extending optical propagation core. The cladding has a reflection region of a varying refractive index in the longitudinal direction.Type: ApplicationFiled: July 3, 2009Publication date: November 3, 2011Applicant: University of BathInventors: Peter John Roberts, Abdel Fetah Benabid
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Patent number: 8041172Abstract: The present invention relates to a transmission optical fiber. The optical fiber includes, from its center to its periphery a central core, an intermediate cladding, and a depressed cladding. The optical fiber has an effective area (Seff) of at least about 120 ?m2 at a wavelength of 1550 nm and an effective cutoff wavelength (?Ceff) of less than 1600 nm. The optical fiber has an effective area of more than 120 ?m2 with a cutoff wavelength limited to less than about 1600 nm without degradation of other optical parameters (e.g., attenuation losses and dispersion).Type: GrantFiled: April 7, 2008Date of Patent: October 18, 2011Assignee: Draka Comteq, B.V.Inventors: Pierre Sillard, Denis Molin, Louis-Anne De Montmorillon, Marianne Bigot-Astruc, Simon Richard
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Patent number: 8036503Abstract: An optical delay line is formed from a coil of optical fiber (in many cases microfiber), where the radius of the optical fiber is greater than the wavelength ? of the propagating signal and the radius R of the coil is selected, in consideration with the optical fiber radius, to limit propagation loss by minimizing coupling between adjacent turns of the coil. The difference in dimension between the fiber diameter and wavelength prevents the mode propagating along one turn from coupling into an adjacent turn. It has been discovered that the modal intensity at the interface between the central rod and the coil will be minimized when the radius of the fiber satisfies the following condition: r >> ( R ? 2 ) 1 / 3 , where ?=(2?n)/?, and n is the refractive index of the fiber.Type: GrantFiled: October 13, 2009Date of Patent: October 11, 2011Assignee: DFS Fitel LLCInventor: Mikhail Sumetsky
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Patent number: 8035891Abstract: A photonic bandgap fiber includes a core and a cladding that surrounds the core. In this photonic bandgap fiber, high refractive index portions which have a refractive index higher than that of a medium of the cladding are provided in the cladding so as to form a triangular lattice structure with a lattice constant ?, and the refractive index of the core is higher than the refractive index of the medium of the cladding and lower than the refractive index of the high refractive index portion. The coupling length between the core and the high refractive index portion that is closest to the core is longer than the coupling length between adjacent high refractive index portions, or a periodic structure formed by the high refractive index portions is not provided around the entirely of the area along the circumference of the core.Type: GrantFiled: April 24, 2009Date of Patent: October 11, 2011Assignee: Fujikura Ltd.Inventor: Ryuichiro Goto
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Publication number: 20110243518Abstract: A non-zero dispersion shifted fiber includes a core region, and a clad region located out of the core region. The core region is classified into a plurality of detailed regions in accordance with refractive index contrasts. Among the detailed regions, a region located at a center of the fiber has GeO2 concentration of 3.5 mol % or less.Type: ApplicationFiled: April 1, 2011Publication date: October 6, 2011Inventors: Joong-Ho Pi, Lae-Hyuk Park, Ji-Sang Park, Soon-Il Sohn
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Patent number: 8031999Abstract: A photonic band-gap fiber comprises a first core having a refractive index that is not higher than a refractive index of a clad; a second core that is disposed so as to surround the first core and has a refractive index that is lower than the refractive index of the first core; a clad that surrounds the second core; and a periodic structure portion that is disposed in the clad in a vicinity of the second core and is constituted by high-refractive index portions that have a refractive index higher than that of clad and form the periodic structure, and the periodic-structure portion functions as a wave-length filter. By the function of the periodic structure portion as a wave-length filter, it is possible to reduce the propagation loss of the transmission wavelength and increase the propagation loss of the cutoff wavelength.Type: GrantFiled: September 4, 2009Date of Patent: October 4, 2011Assignee: Fujikura Ltd.Inventor: Ryuichiro Goto
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Patent number: 8027557Abstract: Optical fiber lasers and components for optical fiber laser. An optical fiber laser can comprise a fiber laser cavity having a wavelength of operation at which the cavity provides output light, the cavity including optical fiber that guides light having the wavelength of operation, the fiber having first and second lengths, the first length having a core having a V-number at the wavelength of operation and a numerical aperture, the second length having a core that is multimode at the wavelength of operation and that has a V-number that is greater than the V-number of the core of the first length optical fiber at the wavelength of operation and a numerical aperture that is less than the numerical aperture of the core of the first length of optical fiber. At least one of the lengths comprises an active material that can provide light having the wavelength of operation via stimulated emission responsive to the optical fiber receiving pump light.Type: GrantFiled: September 24, 2007Date of Patent: September 27, 2011Assignee: NufernInventor: Gavin P. Frith
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Publication number: 20110229101Abstract: The present invention embraces a single-mode optical fiber typically having reduced bending losses. The optical fiber includes a central core, an intermediate cladding, a buried trench, and an outer cladding. The optical fiber typically has (i), at a wavelength of 1310 nanometers, a mode field diameter with a nominal value of between about 8.6 microns and 9.5 microns (and a tolerance of ±0.4 micron), (ii) a cable cut-off wavelength of no more than 1260 nanometers, and (iii), for a bending radius of 15 millimeters at a wavelength of 1550 nanometers, bending losses of no more than 0.03 dB/turn.Type: ApplicationFiled: March 15, 2011Publication date: September 22, 2011Applicant: DRAKA COMTEQ B.V.Inventors: Louis-Anne de Montmorillon, Simon Richard, Pierre Sillard
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Publication number: 20110217011Abstract: Multimode optical fibers with a large core diameter and high numerical aperture are disclosed herein. Multimode optical fibers disclosed herein comprise a core region having a radius greater than 30 microns and a cladding region surrounding and directly adjacent to the core region, the cladding region comprising a depressed-index annular portion comprising a depressed relative refractive index. The depressed cladding region is surrounded by a titania doped cladding region. The fiber has a total outer diameter of less than 120 microns, and exhibits an overfilled bandwidth at 850 nm greater than 200 MHz-km.Type: ApplicationFiled: February 25, 2011Publication date: September 8, 2011Inventors: Kevin Wallace Bennett, Scott Robertson Bickham, James A. Derick, Percil Watkins
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Patent number: 8014645Abstract: A 1.55 ?m band dispersion shifted optical fiber is provided which has a low loss and low dispersion slope. A core region “a” is heavily doped with GeO2 . A core region “b” is composed of pure SiO2 glass. A cladding section is arranged around the core region. The cladding section has a lot of holes extending in the longitudinal direction of the optical fiber. The holes of the cladding section are not located at random, but have a honeycomb structure composed of regular hexagons which have a side length of ?, and serve as a primitive lattice. The center of the core section has a region having a refractive index higher than that of the periphery of the core section. The core section has the refractive index distribution in which the group velocity dispersion at the operation wavelength of the region becomes the normal dispersion.Type: GrantFiled: May 16, 2003Date of Patent: September 6, 2011Assignees: Nippon Telegraph and Telephone Corporation, Mitsubishi Cable Industries, Ltd.Inventors: Kazunori Suzuki, Satoki Kawanishi, Hirokazu Kubota, Masatoshi Tanaka, Moriyuki Fujita
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Patent number: 8014426Abstract: An optical device includes an optical material comprising active dopant ions and absorber dopant ions spaced apart from the active dopant ions. The active dopant ions are provided to absorb a first radiation and convert a portion of the first radiation into sensible heat. A concentration profile of the absorber dopant ions is selected to absorb a second radiation different from the first radiation and optionally the first radiation in at least one direction of the optical material so as to control a refractive index profile in the at least one direction of the optical material.Type: GrantFiled: January 23, 2009Date of Patent: September 6, 2011Assignee: Raytheon CompanyInventors: Vladimir V. Shkunov, David A. Rockwell, Scott T. Johnson
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Patent number: 8009950Abstract: A multimode optical fiber comprises a central core having an alpha profile, a depressed cladding having a portion in continuity with the alpha profile of the central core and a stepped portion, and an outer cladding. The alpha profile is obtained by co-doping at least two dopants. The variation in concentration of each dopant and its derivative in relation to the fiber radius are continuous. A multimode fiber for Ethernet optical system with an improved bandwidth is thus obtained.Type: GrantFiled: April 22, 2010Date of Patent: August 30, 2011Assignee: Draka Comteq, B.V.Inventors: Denis Molin, Yves Lumineau, Pierre Sillard, Ralph Petrus Johannes Adrianus Van Lankveld, Koen de Jongh
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Publication number: 20110194827Abstract: Optical fiber refractive index profile designs having an alpha core profile and a negative index trench to control bend loss, are modified by truncating the edge of the alpha core profile and adding a ledge to the truncated core. The result is low bend loss and preservation of low differential mode delay and high bandwidth.Type: ApplicationFiled: February 9, 2011Publication date: August 11, 2011Inventors: Xinli Jiang, Jinkee Kim, George Oulundsen, Yi Sun
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Patent number: 7995889Abstract: An optical transmission fiber comprises a central core having an index difference ?n1 with an outer optical cladding; a first inner cladding having an index difference ?n2 with the outer cladding; and a second buried inner cladding having an index difference ?n3 with the outer cladding of less than ?3·10?3. The second buried inner cladding moreover contains Germanium in a weight concentration of between 0.5% and 7%. The fiber shows reduced bending and microbending losses whilst exhibiting the optical performances of a standard single-mode fiber (SSMF).Type: GrantFiled: November 19, 2009Date of Patent: August 9, 2011Assignee: Draka Comteq, B.V.Inventors: Louis-Anne de Montmorillon, Denis Molin, Pieter Matthijsse, Frans Gooijer, Ivo Flammer, Yves Lumineau, Marianne Bigot-Astruc, Pierre Sillard, Pascale Nouchi
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Patent number: 7991021Abstract: A multimode optical fiber has a core that includes radially dependent dopant materials to provide a desired refractive index profile and a desired Raman gain coefficient profile. A laser diode pump laser array provides high brightness light that is launched into the fiber and is subject to maximum Raman gain along the optical axis, thereby favoring the lowest order mode of the fiber, discriminating against higher order modes and providing a high brightness, diffraction limited output. The fiber can be incorporated into oscillators, amplifiers and other optical devices.Type: GrantFiled: December 5, 2003Date of Patent: August 2, 2011Assignee: Northrop Grumman Systems CorporationInventors: Robert R. Rice, Sami Ali Shakir
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Patent number: 7978947Abstract: A photonic bandgap fiber includes a first core having a refractive index equal to or smaller than a refractive index of a cladding, a second core that is provided to surround the first core and has a refractive index smaller than the refractive index of the first core, the cladding that surrounds the second core, and a periodic structure portion that is provided in the cladding around the second core, and in which high-refractive index portions having a refractive index larger than the refractive index of the cladding form a periodic structure. The periodic structure is configured such that at least the propagation constant of the fundamental mode at a wavelength to be used is in a photonic bandgap, and the propagation constant of a higher-order mode at the wavelength to be used is outside of the photonic bandgap.Type: GrantFiled: August 28, 2009Date of Patent: July 12, 2011Assignee: Fujikura Ltd.Inventor: Ryuichiro Goto
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Patent number: 7970248Abstract: Included among the many structures described herein are photonic bandgap fibers designed to provide a desired dispersion spectrum. Additionally, designs for achieving wide transmission bands and lower transmission loss are also discussed. For example, in some fiber designs, smaller dimensions of high index material in the cladding and large core size provide small flat dispersion over a wide spectral range. In other examples, the thickness of the high index ring-shaped region closest to the core has sufficiently large dimensions to provide negative dispersion or zero dispersion at a desired wavelength. Additionally, low index cladding features distributed along concentric rings or circles may be used for achieving wide bandgaps.Type: GrantFiled: July 16, 2010Date of Patent: June 28, 2011Assignee: IMRA America, Inc.Inventors: Liang Dong, Xiang Peng
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Publication number: 20110141555Abstract: 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: ApplicationFiled: December 14, 2010Publication date: June 16, 2011Applicant: IMRA America, Inc.Inventors: Martin E. Fermann, Liang Dong
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Publication number: 20110135262Abstract: The present invention embraces an optical fiber that includes a central core having an alpha-index profile with respect to an outer cladding. The optical fiber also includes an inner cladding, a depressed trench, and an outer cladding. Typically, the alpha-index profile of the central core is interrupted at a point having a positive refractive index difference with respect to the outer cladding. The optical fiber achieves reduced bending losses and a high bandwidth with a reduced cladding effect for high-data-rate applications.Type: ApplicationFiled: December 3, 2010Publication date: June 9, 2011Applicant: DRAKA COMTEQ, B.V.Inventors: Denis Molin, Marianne Bigot-Astruc, Pierre Sillard, Koen de Jongh
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Publication number: 20110133061Abstract: An embodiment relates to a device comprising a substrate having a front side and a back-side that is exposed to incoming radiation, a nanowire disposed on the substrate and an image sensing circuit disposed on the front side, wherein the nanowire is configured to be both a channel to transmit wavelengths up to a selective wavelength and an active element to detect the wavelengths up to the selective wavelength transmitted through the nanowire.Type: ApplicationFiled: December 8, 2009Publication date: June 9, 2011Applicant: ZENA TECHNOLOGIES, INC.Inventors: Young-June YU, Munib Wober
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Publication number: 20110135263Abstract: The present invention embraces a multimode optical fiber that includes a central core having an alpha-index profile, an inner cladding, a depressed trench, and an outer cladding (e.g., an outer optical cladding). Typically, the central core's alpha-index profile has a minimum refractive index at the central core's radius that corresponds to a refractive index difference with respect to the outer cladding. The optical fiber achieves reduced bending losses and a high bandwidth with a reduced cladding effect for high-data-rate applications.Type: ApplicationFiled: December 3, 2010Publication date: June 9, 2011Applicant: DRAKA COMTEQ, B.V.Inventors: Denis Molin, Marianne Bigot-Astruc, Pierre Sillard, Koen de Jongh
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Patent number: 7957619Abstract: An all-fiber optical pulse compression arrangement comprises a concatenated arrangement of a section of input fiber (e.g., a single mode fiber), a graded-index (GRIN) fiber lens and a section of pulse-compressing fiber (e.g., LMA fiber). The GRIN fiber lens is used to provide mode matching between the input fiber (supporting the propagation of chirped optical pulses) and the pulse-compressing fiber, with efficient pulse compression occurring along the length of the LMA fiber. The dispersion and length of the LMA fiber section are selected to provide the desired degree of pulse compression; for example, capable of reconstituting a femtosecond pulse as is used in supercontinuum generation systems.Type: GrantFiled: October 26, 2010Date of Patent: June 7, 2011Assignee: OFS Fitel, LLCInventors: Jeffrey W. Nicholson, Andrew D. Yablon
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Publication number: 20110123162Abstract: The present invention embraces an optical fiber that includes a central core having an alpha-index profile with respect to an outer cladding, a first depressed trench, an inner cladding, a second depressed trench, and an outer cladding (e.g., an outer optical cladding). The second depressed trench's volume is typically greater than the first depressed trench's volume. The optical fiber achieves reduced bending losses and a high bandwidth with a reduced cladding effect for high-data rate applications.Type: ApplicationFiled: November 24, 2010Publication date: May 26, 2011Applicant: DRAKA COMTEQ, B.V.Inventors: Denis Molin, Pierre Sillard
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Publication number: 20110123161Abstract: The present invention embraces an optical fiber that includes a central core having an alpha refractive index profile with respect to an outer cladding. The optical fiber also includes an inner cladding, a depressed trench, and an outer cladding. The optical fiber achieves reduced bending losses and a high bandwidth with a reduced cladding effect for high-data-rate applications.Type: ApplicationFiled: November 24, 2010Publication date: May 26, 2011Applicant: DRAKA COMTEQ B.V.Inventors: Denis Molin, Pierre Sillard
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Publication number: 20110103758Abstract: An optical fiber comprising: a core formed in a center axis area; an inner clad layer, disposed around the core, having a refractive index smaller than that of the core; a pore layer, disposed around the inner clad layer, having a plurality of elongated pores; and an outer clad layer, disposed around the pore layer, having a refractive index equal to or smaller than the refractive index of the core, wherein a length of the elongated pores is not larger than 200 m.Type: ApplicationFiled: October 29, 2010Publication date: May 5, 2011Inventors: Kazumasa OHSONO, Bing YAO, Tomomi ONOSE
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Publication number: 20110103757Abstract: Side-emitting step index fibers. Between core and cladding, the side-emitting step index fibers have scattering centers that ensure the coupling out of light from the fiber. The side-emitting step index fibers are produced by preforms that contain inlay rods, in which the scattering centers are embedded and which are applied to the outer region of the fiber core during fiber drawing. Alternatively, at least one inlay tube can be used.Type: ApplicationFiled: February 3, 2009Publication date: May 5, 2011Inventors: Jochen Alkemper, Bernd Hoppe, Schulthies Bernd, Simone Monika Ritter, Inka Henze, Detlef Wolff, Axel Curdt
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Publication number: 20110103759Abstract: Acoustically anti-guiding optical structures are provided. In an exemplary acoustically anti-guiding fiber, a suitable cladding size for ant guiding fibers occurs wherein the cladding size is determined such that the net material dampening in the cladding is large enough to dampen acoustic waves. In another embodiment, a cladding can be considered infinite if the round-trip time from a core to an outer cladding boundary (or interface) is greater than a coherence time of an acoustic wave.Type: ApplicationFiled: November 22, 2010Publication date: May 5, 2011Inventor: Peter Dragic
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Publication number: 20110103762Abstract: The present invention discloses a method for fabricating an optical filter based on polymer asymmetric bragg couplers using holographic interference techniques, soft lithography, and micro molding, which comprises following steps: prepare a UV polymer with gratings; coating photo-resister film on the UV polymer, and exposed by UV light to obtain a photo-resister mold with two grooves each having gratings; coating diluted PDMS film on the photo-resister mold, and baking the PDMS film to obtain a PDMS mold having two waveguides with gratings; placing glass substrate over the PDMS mold to form a first tunnel; injecting a precure UV polymer into the first tunnel to from a cladding layer with two grooves having gratings pattern at its bottom; placing glass slide over the cladding layer and injecting a mixed UV polymer into the grooves to form waveguide cores; placing a second glass substrate over the cladding layer, and injecting UV polymer to form an upper cladding layer laminated with the cladding layer to obtaiType: ApplicationFiled: October 30, 2009Publication date: May 5, 2011Inventors: KUN-YI LEE, Wei-Ching Chuang, Cheng-Che Lee, Wei-Yu Lee
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Publication number: 20110097048Abstract: In a technique for fabricating a birefringent optical fiber, a preform rod is fabricated having a longitudinal axis, an outer peripheral surface, and a selected refractive index variation. At least one longitudinal groove is cut into the preform rod through its outer peripheral surface, wherein the at least one longitudinal groove has a cross sectional area equal to that of a respective birefringence-inducing stress element to be loaded into the groove, such that when the stress element is loaded into the groove, a portion of the stress element protrudes outside of the circumference of the preform. A respective birefringence-inducing stress element is loaded into the at least one longitudinal groove. A preform assembly is created by positioning the loaded preform rod within an overcladding tube. The preform assembly is drawn into optical fiber.Type: ApplicationFiled: September 29, 2010Publication date: April 28, 2011Applicant: OFS FITEL, LLCInventor: Jorgen Ostgaard Olsen
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Publication number: 20110097046Abstract: A stretcher fiber has a core region, inner trench region, ring region, outer trench region, and outer cladding region. The fiber regions are structured to provide the stretcher fiber with a relationship between dispersion and wavelength, such that the second and third derivatives of the stretcher fiber's propagation constant with respect to angular frequency have a shape and wavelength range matching those of a selected compressor module.Type: ApplicationFiled: January 6, 2011Publication date: April 28, 2011Applicant: OFC Fitel, LLCInventors: Lars Gruner-Nielsen, Dan Peter Jakobsen, Kim Geissmann Jespersen
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Patent number: 7933482Abstract: Optical fiber probe tips and methods for fabricating the same are presented. One method entails immersing a distal end of an optical fiber having a cladding and a core into an etching solution and simultaneously etching the cladding and the core using the etching solution for tapering the cladding and the core to form a tapered cladding and a tapered core tip. The optical fiber probe tips are suitable for near-field, scanning, optical microscopy (NSOM).Type: GrantFiled: April 27, 2006Date of Patent: April 26, 2011Assignee: University of Maryland, College ParkInventors: Donald C. Schmadel, Howard Dennis Drew, Vivekananda Adiga, Max Anton Cubillos-Moraga
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Publication number: 20110091175Abstract: Methods and apparatus relate to optical fibers suitable for use in sensing applications exposed to radiation environments. The fibers include a core of pure silica or chlorine doped silica surrounded by a fluorinated silica cladding. These glasses for the core and cladding utilize dopants that resist radiation-induced attenuation. A two step process for forming the cladding can achieve necessary concentrations of the fluorine by performing a soot deposition process in a different environment from a consolidation process where the soot is sintered into a glass. Concentration of fluorine doped into the cladding layer enables obtaining a numerical aperture that confines a mono-mode of the fiber to resist bend-induced attenuation. Dimensions of the fiber further facilitate bending ability of the fiber.Type: ApplicationFiled: September 28, 2010Publication date: April 21, 2011Inventors: PAUL E. SANDERS, Eward M. Dowd, Brian J. Pike
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Patent number: 7929818Abstract: According to some embodiments an optical waveguide fiber comprises (i) a Ge free core having an effective area of 100 ?m2to 150 ?m2, at 1550 nm wavelength, said core comprising: a) a central core region extending radially outwardly from a centerline to a radius r1, and having a relative refractive index percent profile ?1(r) in % measured relative to pure silica, wherein ?0.1%??1(r)?0.12%, wherein the central core region has a maximum relative refractive index percent, ?1MAX; (b) a first annular core region surrounding and directly adjacent to the central core region, having an ? value 1.5???10, and extending to an outer radius r2, wherein 6 ?m?r2?10 ?m, and having a relative refractive index percent profile, ?2(r) in % measured relative to pure silica, a minimum relative refractive index ?2MIN, a maximum relative refractive index ?2MAX and the relative refractive index measured at a radius r=2 ?m, wherein 0.45??2?0; ?0.25??2MIN??0.Type: GrantFiled: June 30, 2010Date of Patent: April 19, 2011Assignee: Corning IncorporatedInventors: Scott Robertson Bickham, Rostislav Radievich Khrapko, Snigdharaj Kumar Mishra
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Patent number: 7925132Abstract: A core includes a center core region, a core layer that is formed around the center core region and that has a refractive index lower than that of the center core region, and at least one buffer core layer that is formed between the center core region and the core layer and that has a refractive index lower than that of the center core region and higher than that of the core layer. A cladding is formed around the core layer and that has a refractive index lower than that of the center core region and higher than that of the core layer. An effective core area at a wavelength of 1550 nm is equal to or smaller than 18 ?m2.Type: GrantFiled: June 19, 2009Date of Patent: April 12, 2011Assignee: The Furukawa Electric Co., Ltd.Inventors: Yuki Taniguchi, Jiro Hiroishi, Masanori Takahashi, Ryuichi Sugizaki