Entries |
Document | Title | Date |
20080199136 | Optical waveguide device - An optical waveguide device includes a lower cladding layer, a high refractive index region provided on the lower cladding layer, a pair of cores provided on the lower cladding layer on both sides of the high refractive index region, and an upper cladding layer provided on the high refractive index region and the pair of cores. One of the upper and lower cladding layers has a pair of band-shaped parts disposed between the high refractive index region and the pair of cores. | 08-21-2008 |
20080205838 | Optical Device Including a Buried Grating With Air Filled Voids and Method For Realising It - An optical device includes a waveguide, the waveguide having a core surrounded by a cladding, the cladding including a lower cladding, the core being placed above the lower cladding, a lateral cladding adjacent to a first and a second opposite lateral sides of the core, and an over-cladding, the over-cladding being positioned above the core and lateral cladding. The core and lateral cladding define a guiding layer. A grating structure is formed in the guiding layer, which includes a plurality of empty trenches. The over-cladding includes a cap layer, the cap layer having a first refractive index and being in contact with the grating structure. The first refractive index of the cap layer is substantially identical to the refractive index of the lateral cladding in contact with the cap layer. Additionally, the cap layer is located above the trenches and forms bridges connecting each couple of adjacent trenches of the plurality, so that voids are formed in the trenches. | 08-28-2008 |
20080232753 | OPTICAL WAVEGUIDE AND METHOD OF MANUFACTURING THE SAME - There is provided an optical waveguide including: a waveguide core through which light propagates; a cavity that is present inside the waveguide core so as to be open at least one end in the thickness direction of the waveguide core; a layer-form first cladding having a lower refractive index than the waveguide core, and sealing at least one of the at least one opening of the cavity to thereby close the opening of the cavity; and a second cladding having a lower refractive index than the waveguide core, and surrounding the waveguide core. There is also provided a method of manufacturing the optical waveguide. | 09-25-2008 |
20080273849 | SINGLE MODE OPTICAL FIBER WITH IMPROVED BEND PERFORMANCE - 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. | 11-06-2008 |
20080273850 | OPTICAL FIBER AND OPTICAL-FIBER TRANSMISSION LINE - An optical fiber that transmits a signal light in a fundamental propagation mode has a cutoff wavelength longer than a wavelength of the signal light, a wavelength dispersion of the fundamental propagation mode of −5 ps/nm/km to −1 ps/nm/km at a wavelength of 1550 nanometers, an effective core area of the fundamental propagation mode larger than 45 μm | 11-06-2008 |
20080285928 | Optical fiber mounting waveguide device and method for fabricating same - An optical fiber mounting waveguide device and a method for fabricating the same, which provide a low optical connection loss and a high productivity. An under cladding layer ( | 11-20-2008 |
20090003788 | COMPOSITE WAVEGUIDE - A composite waveguide includes a central core configured to transmit a plurality of modes and at least one side core helically wound about the central core and configured to be selectively coupled to at least a portion of the plurality of modes in the central core. | 01-01-2009 |
20090003789 | IMAGING SYSTEM AND RELATED TECHNIQUES - A method and apparatus for imaging using a double-clad fiber is described. | 01-01-2009 |
20090022463 | IMAGING SYSTEM AND RELATED TECHNIQUES - A method and apparatus for imaging using a double-clad fiber is described. | 01-22-2009 |
20090080846 | Optical Waveguide and Method for Manufacturing the Same - The present invention provides a wafer level optical waveguide and a method for manufacturing the same, wherein it can be realized by employing manufacture process for semiconductor integrated circuits to manufacture a micron optical waveguide with a smooth interface, uniform thickness and a mirror-like end with any angle, and to remarkably reduce its manufacture cost at the meantime. | 03-26-2009 |
20090080847 | OPTICAL WAVEGUIDE AND METHOD FOR MANUFACTURING THE SAME - The present invention provides a wafer level optical waveguide and a method for manufacturing the same, wherein it can be realized by employing manufacture process for semiconductor integrated circuits to manufacture a micron optical waveguide with a smooth interface, uniform thickness and a mirror-like end with any angle, and to remarkably reduce its manufacture cost at the meantime. | 03-26-2009 |
20090103873 | OPTICAL WAVEGUIDE AND METHOD FOR MANUFACTURING THE SAME - An optical waveguide includes a layer A and a plurality of cores enclosed in a cladding. During production of the optical waveguide, a layered film including alternate layers of a core layer and a cladding layer is cut so as to form a groove that penetrates through the layered film in a thickness direction and so as to form a plurality of core portions, and the layer A is provided so as to partially fill the groove depthwise and so as to maintain spacing between the plurality of core portions before the core portions is enclosed by the cladding. | 04-23-2009 |
20090103874 | OPTICAL FIBER, A FIBER LASER, A FIBER AMPLIFIER AND ARTICLES COMPRISING SUCH ELEMENTS - The invention relates to an optical fiber defining a longitudinal direction, the optical fiber comprising a core having a diameter larger than 10 μm, said core comprises at least two solid segments of different composition, at least one of the segments comprises a photo-sensitive material. The core may be segmented in its cross-sectional direction and/or in its longitudinal direction. The optical fiber may comprise a Bragg grating written in at least one of said solid core segments | 04-23-2009 |
20090162021 | OPTICAL WAVEGUIDE FOR LUMINESCENT DEVICE AND MANUFACTURING METHOD THEREOF - An optical waveguide for a luminescent device capable of efficiently leading light beams propagating through a core outwardly to cause light emission, and a manufacturing method thereof. The optical waveguide for a luminescent device includes an under cladding layer | 06-25-2009 |
20090196559 | Resin Composition for Optical Materials, Resin Film for Optical Material, and Optical Waveguide - A resin composition for an optical material, which is excellent in heat resistance and transparency and is soluble in an aqueous alkali solution, a resin film for an optical material made of the resin composition, and an optical waveguide using the same are provided. The resin composition for an optical material includes: (A) an alkali-soluble (meth)acrylate polymer containing a maleimide skeleton in a main chain; (B) a polymerizable compound; and (C) a polymerization initiator. The resin film for an optical material is made of the resin composition for an optical material. The optical waveguide has a core part and/or a clad layer formed using the resin composition for an optical material or the resin film for an optical material. | 08-06-2009 |
20090245742 | SILICA-BASED SINGLE CORE OPTICAL FIBER, SILICA-BASED MULTI CORE OPTICAL FIBER, AND FABRICATION METHOD FOR THE SAME - A silica-based multi core optical fiber and a fabrication method for the same are provided, and include two or more cores of GeO | 10-01-2009 |
20090263090 | MULTIPLE-CORE OPTICAL FIBER WITH COUPLING BETWEEN THE CORES - 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. | 10-22-2009 |
20090310925 | PURE SILICA CORE, HIGH BIREFRINGENCE, SINGLE POLARIZATION OPTICAL WAVEGUIDE - Methods and apparatus provide for birefringent waveguides suitable for optical systems exhibiting polarization dependence such as interferometer sensors including Sagnac interferometric fiber optic gyroscopes (IFOG). The waveguides, for some embodiments, may offer single polarization performance over lengths of about a kilometer or more due to polarization dependent attenuation. According to some embodiments, the waveguides incorporate a pure silica core for resistance to radiation-induced attenuation (RIA). | 12-17-2009 |
20090317040 | OPTICAL FIBER AND OPTICAL FIBER PREFORM - An optical fiber is constituted by: a three-layer structured core which includes, a first core (having a relative refractive index difference of Δ | 12-24-2009 |
20090317041 | PHOTONIC BANDGAP FIBER - 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. | 12-24-2009 |
20100008634 | OPTICAL FIBER ARTICLE FOR HANDLING HIGHER POWER AND METHOD OF FABRICATING OR USING - An optical fiber preform, and method for fabricating, having a first core, a second core spaced from the first core and first and second regions, the first region having an outer perimeter having a first substantially straight length and the second region having an outer perimeter having a second substantially straight length facing the first straight length. One of the regions can comprise the first core and the other comprises the second core. The preform can be drawn with rotation to provide a fiber wherein a first core of the fiber is multimode at a selected wavelength of operation and a second core of the fiber is spaced from and winds around the first core and has a selected longitudinal pitch. The second core of the fiber can couple to a higher order mode of the first core and increase the attenuation thereof relative to the fundamental mode of the first core. | 01-14-2010 |
20100027950 | PHOTOSENSITIVE RESIN COMPOSITION, PHOTOSENSITIVE RESIN CURED MATTER, PHOTOSENSITIVE RESIN FILM, PHOTOSENSITIVE RESIN FILM CURED MATTER AND OPTICAL WAVEGUIDE OBTAINED BY USING THE SAME - Provided are a photosensitive resin composition which is soluble in an alkaline aqueous solution and which has a good propagation loss in a visible light wavelength region, a photosensitive resin cured matter, a photosensitive resin film, a photosensitive resin film cured matter and an optical waveguide obtained by using the same. | 02-04-2010 |
20100135629 | FIBER OPTIC CABLES AND ASSEMBLIES AND THE PERFORMANCE THEREOF - A fiber optic jumper assembly comprising at least one bend performance optical fiber comprising a core region and a cladding region surrounding the core region, the cladding region comprising an annular hole-containing region comprised of non-periodically disposed holes, a protective covering positioned over the at least one bend performance optical fiber, and at least one connector mounted upon each end of the at least one bend performance optical fiber. A preconnectorized fiber optic jumper assembly comprising a microstrucutred fiber having a delta attenuation of 0.00 dB at 5 wraps about a 6 mm diameter at a reference wavelength of 1625 nm. | 06-03-2010 |
20100150508 | Optical fiber mounting waveguide device and method for fabricating same - An optical fiber mounting waveguide device includes a substrate, an optical fiber mounting groove provided on a part of the substrate for mounting an optical fiber, an under cladding layer and a core sequentially formed on the substrate, and an over cladding layer formed on the core, the over cladding layer having an end surface facing to the optical fiber mounting groove, and wherein the core and the under cladding layer are protruded toward the optical fiber mounting groove with respect to the end surface of the over cladding layer. | 06-17-2010 |
20100189399 | Single-Mode Optical Fiber Having an Enlarged Effective Area - A single-mode optical fiber includes a central core, a first inner cladding, a second inner cladding, and an outer cladding. The optical fiber, at a wavelength of 1550 nanometers, has an effective area greater than or equal to 100 μm | 07-29-2010 |
20100195965 | OPTICAL COMMUNICATION SYSTEM AND ARRANGEMENT CONVERTER - The present invention relates to an optical communication system or the like, which comprises a multicore fiber with a plurality of cores that are two-dimensionally arrayed in a cross-section thereof. In the optical communication system, an arrangement converter, provided between a multicore fiber and an Optical Line Terminal (OLT) having light emitting areas arrayed one-dimensionally, comprises first and second end faces, and a plurality of optical waveguides. The optical waveguides are disposed such that one of the end faces coincides with the first end face and the other end face coincides with the second end face. In particular, the optical waveguide end face array on the first end face and the optical waveguide end face array on the second face are different, contributing to an optical link between network resources of different types. | 08-05-2010 |
20100290750 | MULTI-CORE OPTICAL FIBER - A multi-core optical fiber includes: a plurality of core portions; and a cladding portion positioned around the plurality of core portions and including, in a cross section of the cladding portion, a flat portion in at least a part of an outer periphery of the cladding portion and a remaining portion of the outer periphery that is circular, the cross section being perpendicular to a longitudinal direction of the cladding portion. | 11-18-2010 |
20100296782 | OPTICAL FIBRE HAVING RESISTANCE TO HYDROGEN-INDUCED ATTENUATION - An optical fiber having resistance to hydrogen-induced attenuation includes a core and cladding including silica. At least one of the core and the cladding includes a dopant capable of not increasing reactivity of the silica with hydrogen. An optical fiber assembly includes a core and cladding including silica. At least one of the core and the cladding includes a dopant capable of changing the refractive index of the fiber core or cladding while not increasing reactivity of the fiber with hydrogen. The optical fiber in some examples further includes a hermetic layer disposed about the cladding. Some implementations include a “getter” layer, which may be an outside part of the fiber cladding been inside the hermetic coating. The “getter” layer includes silica and a dopant increasing reactivity of the layer with hydrogen. The optical fiber assembly optionally includes a sheath disposed about the cladding. | 11-25-2010 |
20100296783 | OPTICAL FIBER - Provided is an optical fiber including: a first core at a center thereof; a second core adjacent to the first core to cover a circumference of the first core; a third core adjacent to the second core to cover a circumference of the second core; and a cladding adjacent to the third core to cover a circumference of the third core, where conditions of 0.28%≦Δ | 11-25-2010 |
20100296784 | MULTI-CORE OPTICAL FIBER - A multi-core optical fiber includes: a plurality of core portions; and a cladding portion positioned around the plurality of core portions and including a marker for identifying a position of a specific one of the plurality of core portions. | 11-25-2010 |
20110052129 | MULTI-CORE OPTICAL FIBER - The present invention relates to a multi-core optical fiber having a structure to effectively reduce crosstalk between adjacent core regions among a plurality of core regions. The multi-core optical fiber ( | 03-03-2011 |
20110058781 | Multimode Optical Fiber Having Improved Bending Losses - The present invention embraces a multimode optical fiber that includes a central core having an alpha refractive index profile with respect to an outer optical cladding and a depressed trench positioned between the central core and the outer optical cladding. The central core's refractive index at its periphery is the same as the outer cladding's refractive index. Typically, an inner cladding is positioned between the central core and the depressed trench. The optical fiber achieves reduced bending losses without significantly increasing numerical aperture. | 03-10-2011 |
20110075981 | RESIN COMPOSITION FOR OPTICAL MATERIAL, RESIN FILM FOR OPTICAL MATERIAL, AND OPTICAL WAVEGUIDE - A resin composition for an optical material, which is excellent in heat resistance and transparency and is soluble in an aqueous alkali solution, a resin film for an optical material made of the resin composition, and an optical waveguide using the same are provided. The resin composition for an optical material includes: (A) an alkali-soluble (meth)acrylate polymer containing a maleimide skeleton in a main chain; (B) a polymerizable compound; and (C) a polymerization initiator. The resin film for an optical material is made of the resin composition for an optical material. The optical waveguide has a core part and/or a clad layer formed using the resin composition for an optical material or the resin film for an optical material. | 03-31-2011 |
20110129190 | Techniques for Manipulating Crosstalk in Multicore Fibers - A multicore optical fiber includes a plurality of core regions disposed within a common cladding region. Each of the plurality of core regions is configured, in combination with the common cladding region, to propagate light along a longitudinal axis of the fiber. At least two core regions are configured to inhibit resonant coupling of propagated light therebetween within a selected region of operation. At least one segment of the fiber includes a twist that is configured such that when the twisted segment is subjected to a bend having a selected radius, the twist creates a controlled change in the amount of crosstalk between the at least two core regions, compared with the amount of crosstalk between the at least two core regions when a bend having the selected radius is introduced into a non-twisted segment of the fiber. | 06-02-2011 |
20110158596 | OPTICAL WAVEGUIDE, OPTICAL WIRING LINE, OPTICAL/ELECTRICAL COMBINATION SUBSTRATE AND ELECTRONIC DEVICE - An optical waveguide is provided. The optical waveguide includes a plurality of core portions and a plurality of clad portions in which each core portion being provided between a pair of clad portions. Each of the plurality of clad portions comprises: a low refractive-index area being in contact with the core portion, wherein a refractive index of the low refractive-index area is lower than that of the plurality of core portions; and a plurality of high refractive-index areas separated from the core portion through the low refractive-index area, wherein a refractive index of the plurality of high refractive-index areas is higher than the refractive index of the low refractive-index area. The plurality of high refractive-index areas are provided in the clad portion in an aligned manner or in a scattered manner. The plurality of high refractive-index areas are constituted of the same kind of material as a constituent material of the plurality of core portions. The plurality of high refractive-index areas make light scattered. Such light does not enter the plurality of core portions and involuntarily enters the plurality of clad portions. By doing so, it is possible to prevent the light from reaching light receiving elements, so that it is possible to improve quality of optical communications. | 06-30-2011 |
20110188825 | OPTICAL FIBER WITH RESONANT STRUCTURE OF CLADDING FEATURES CONNECTED TO LIGHT SINK - An optical fibre that use index-guidance formed with a low index cladding or a microstructured cladding using voids/holes or low index features ( | 08-04-2011 |
20110206330 | MULTICORE OPTICAL FIBER - The present invention relates to a multicore optical fiber having a structure for effectively inhibiting polarization mode dispersion from increasing, and the multicore optical fiber comprises a plurality of multicore units and a cladding region integrally covering the plurality of multicore units while separating the multicore units from each other. Each of the plurality of multicore units includes a plurality of core regions arranged such as to construct a predetermined core arrangement structure on a cross section orthogonal to an axis. The core arrangement structure of each multicore unit on the cross section has such a rotational symmetry as to coincide with the unrotated core arrangement structure at least three times while rotating by 360° about a center of the multicore unit, thereby reducing the structural asymmetry of each multicore unit. This lowers the structural birefringence in each multicore unit, thereby inhibiting the polarization mode dispersion from increasing in the multicore optical fiber. | 08-25-2011 |
20110211796 | LOW BEND LOSS OPTICAL FIBER - An optical fiber having both low macrobend loss and low microbend loss. The fiber has a first inner cladding region having an outer radius r | 09-01-2011 |
20110243519 | OPTICAL FIBERS WITH TRUNCATED CORES - 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. | 10-06-2011 |
20110268402 | SEMICONDUCTOR OPTICAL DEVICE - A semiconductor optical device includes at least a lower cladding layer formed on a semiconductor substrate, a core layer formed on the lower cladding layer, and an upper cladding layer formed on the core layer. The core layer includes a first core layer of a material susceptible to oxidation and a second core layer of a material unsusceptible to oxidation, the first core layer and the second core layer being connected in sequence in an optical propagation direction. The second core layer is formed at a facet where a light is input or output. | 11-03-2011 |
20110286711 | OPTICAL FIBER - Provided is an optical fiber including: a core at a center thereof; a first cladding adjacent to the core to cover a circumference of the core; and a second cladding adjacent to the first cladding to cover a circumference of the first cladding, where 0.35%≦(Δ | 11-24-2011 |
20120008908 | MULTI-CORE OPTICAL FIBER - A multi-core optical fiber includes: a plurality of core portions; and a cladding portion positioned around the plurality of core portions and including a marker for identifying a position of a specific one of the plurality of core portions. | 01-12-2012 |
20120141081 | MULTIPLE-CORE OPTICAL FIBER WITH COUPLING BETWEEN THE CORES - 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. | 06-07-2012 |
20120195562 | MANUFACTURING METHOD FOR AN OPTICAL WAVEGUIDE AND OPTICAL WAVEGUIDE BODY USED THEREFOR - Provided is a manufacturing method for an optical waveguide in which, when the optical waveguide is cut and a contour thereof is processed, accuracy of a cut position is improved by improving visibility of an alignment mark. An undercladding layer, cores, and alignment marks are formed on a front surface of a substrate. Then, an overcladding layer is formed using a photomask so as to cover the cores with the alignment marks being exposed. After the substrate is separated to manufacture an optical waveguide body, a cut position is located with reference to the alignment marks from a rear surface side of the undercladding layer, and the undercladding layer and the overcladding layer are cut to manufacture the optical waveguide. | 08-02-2012 |
20120195563 | MULTICORE FIBER - The multicore fiber comprises 7 or more cores, wherein diameters of the adjacent cores differ from one another, wherein each of the cores performs single-mode propagation, wherein a relative refractive index difference of each of the cores is less than 1.4%, wherein a distance between the adjacent cores is less than 50 μm, wherein, in a case where a transmission wavelength of each of the cores is λ, the distance between the adjacent cores is | 08-02-2012 |
20120219261 | MULTI-CORE OPTICAL FIBER AND METHOD OF PRODUCING THE SAME - A multi-core optical fiber according to the present invention includes plural single-core optical fibers, and comprises an intermediate portion in which a side surface of each single-core optical fiber is covered with a resin layer, and a terminal portion in which the each single-core optical fiber is exposed from the resin layer. In the terminal portion of the multi-core optical fiber, the single-core optical fibers are separated from each other. | 08-30-2012 |
20120230640 | MULTICORE OPTICAL FIBER - The present invention relates to a multicore optical fiber having a structure for suppressing core-to-core crosstalk. The multicore optical fiber ( | 09-13-2012 |
20120275751 | High-Bandwidth, Radiation-Resistant Multimode Optical Fiber - 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 r | 11-01-2012 |
20120301093 | Single-Mode Optical Fiber - A single-mode optical fiber includes a central core surrounded by an outer cladding. The optical fiber includes at least first and second depressed claddings positioned between the central core and the outer cladding. The central core typically has a radius of between about 3.5 microns and 5.5 microns and a refractive-index difference with the outer cladding of between about −1×10 | 11-29-2012 |
20120315006 | Single-Mode Optical Fiber - A single-mode optical fiber includes a central core surrounded by an outer optical cladding. The optical fiber includes an inner depressed cladding, a ring, and an outer depressed cladding positioned between the central core and the outer optical cladding. The central core typically has a refractive-index difference (Dn | 12-13-2012 |
20120321264 | Double Clad Optical Fiber with Sealed Stripped Portion - A double clad optical fiber having a portion extending along its length along which an outer waveguide cladding and a protective jacket are absent and having faces of the second waveguide cladding at two lengthwisely opposite ends, wherein a water impervious sealant is applied to impede lengthwise diffusion of water through the faces of the second waveguide cladding | 12-20-2012 |
20130004135 | Multimode Optical Fiber - A depressed graded-index multimode optical fiber includes a central core, an inner depressed cladding, a depressed trench, an outer depressed cladding, and an outer cladding. The central core has an alpha-index profile. The depressed claddings limit the impact of leaky modes on optical-fiber performance characteristics (e.g., bandwidth, core size, and/or numerical aperture). | 01-03-2013 |
20130016949 | MULTICORE FIBERAANM YAO; BingAACI HitachiAACO JPAAGP YAO; Bing Hitachi JPAANM OHSONO; KazumasaAACI HitachiAACO JPAAGP OHSONO; Kazumasa Hitachi JPAANM SHIINA; NoribumiAACI HitachiAACO JPAAGP SHIINA; Noribumi Hitachi JP - A multicore fiber includes cores located at vertexes of a polygonal ring and a cladding including sub medium regions and covering the cores. A refractive index of the cladding is lower than a refractive index of the cores and higher than a refractive index of the sub medium regions. The sub medium regions are arranged at positions to reduce a crosstalk between adjacent cores of the cores. | 01-17-2013 |
20130039627 | Systems And Methods For Optical Transmission Using Supermodes - In some embodiments, coupled multi-core fiber is used for optical transmission. The coupled multi-core fiber includes multiple cores each supporting a spatial mode. The cores are positioned close enough to cause coupling between their modes that generates supermodes, that are used to transmit data. | 02-14-2013 |
20130044988 | COUPLED MULTICORE FIBER - A coupled multi-core fiber | 02-21-2013 |
20130044989 | METHOD OF PRODUCING PREFORM FOR COUPLED MULTI-CORE FIBER, METHOD OF PRODUCING COUPLED MULTI-CORE FIBER, AND COUPLED MULTI-CORE FIBER - Provided is a method of producing a preform | 02-21-2013 |
20130101261 | RADIATION-RESISTANT RARE-EARTH-DOPED OPTICAL FIBER AND METHOD OF RADIATION-HARDENING A RARE-EARTH-DOPED OPTICAL FIBER - A radiation-resistant optical fiber includes at least one core and at least one first cladding surrounding the core. The core includes a phosphosilicate matrix, the core being rare-earth doped, the rare earth being chosen from erbium, ytterbium, neodymium, thulium or erbium-ytterbium of thulium-holmium codoped and the core is cerium codoped. Also described is a method for radiation-hardening an optical fiber including the core having a phosphosilicate matrix, the core being rare-earth doped, the rare earth being chosen from erbium, ytterbium, neodymium and thulium, or erbium-ytterbium or thulium-holmium codoped, and including a step of cerium codoping the core of the fiber. | 04-25-2013 |
20130129292 | BI-DIRECTIONAL OPTICAL COMMUNICATION METHOD AND MULTI-CORE OPTICAL FIBER - The present invention relates to a multi-core optical fiber applicable to an optical transmission line of bi-directional optical communication and a bi-directional optical communication method. The multi-core optical fiber has plural cores in a common cladding. Signal light is transmitted in a first direction through an arbitrary core among the cores, whereas the signal light is transmitted in a second direction opposite to a first direction, through all the nearest-neighbor cores to the arbitrary core. | 05-23-2013 |
20130136410 | MULTI-CORE OPTICAL FIBER - The present invention relates to a multi-core optical fiber having a structure to effectively reduce crosstalk between adjacent core regions among a plurality of core regions. The multi-core optical fiber ( | 05-30-2013 |
20130156393 | MULTICORE FIBER AND CORE PLACEMENT METHOD FOR MULTICORE FIBER - In a multicore fiber in which multiple single mode cores are stored in one optical fiber, the multicore fiber has a lattice-point arrangement in which multiple lattice points are periodically arranged two-dimensionally with translational symmetry and rotational symmetry or one of translational symmetry and rotational symmetry and, in that lattice-point arrangement, multiple cores are arranged with the lattice points of the lattice-point arrangement as reference positions. By giving different perturbations to the propagation constants of the cores, the propagation constants of the cores are each varied from the original propagation constants. Because of the variation in the propagation constants, the core-to-core coupling amount, which is dependent on the varied propagation constants, fall below a predetermined setting amount. Suppressing the coupling between homogeneous cores in this way reduces the distance between the homogeneous cores, thus increasing the core density of the multicore fiber without increasing the types of heterogeneous cores. | 06-20-2013 |
20130183015 | OPTICAL WAVEGUIDE AND ELECTRONIC DEVICE - An optical waveguide has: a core layer which includes at least one core portion for transmitting a light signal and at least two side cladding portions respectively provided at lateral sides of the core portion so as to be opposed to each other; and two cladding layers respectively provided at vertical sides of the core layer. The core layer is configured to have a horizontal refractive index distribution curve W in a width direction of a cross-sectional plane of the core layer. The horizontal refractive index distribution curve W has a region including at least two local minimum values, at least one first local maximum value and at least two second local maximum values smaller than the first local maximum value. A refractive index in whole of the horizontal refractive index distribution curve W continuously varies. | 07-18-2013 |
20130195411 | MULTI-CORE OPTICAL FIBER - A multi-core optical fiber | 08-01-2013 |
20130209046 | SOLD PHOTONIC BAND GAP FIBER, FIBER MODULE USING SOLD PHOTONIC BAND GAP FIBER, FIBER AMPLIFIER, AND FIBER LASER - A solid photonic band gap fiber includes: a core area located at a central portion of a cross-section with respect to a longitudinal direction of the fiber, the core area being formed of a solid substance having a low refractive index; cladding areas having base portions formed of a solid substance having a low refractive index, the cladding areas surrounding the core area; and a plurality of fine high refractive index scatterers provided in the cladding areas, and disposed in a dispersed manner so as to surround the core area, the number of fine high refractive index scatterers being formed of a solid substance having a high refractive index, wherein in a state that the solid photonic band gap fiber is held at a predetermined bending radius, propagation in a high-order mode is suppressed by using a difference in a bending loss between a fundamental mode and the high-order mode, and only the fundamental mode is substantially propagated, the fundamental mode and the high-order mode being caused by bending. | 08-15-2013 |
20130243383 | Athermal Photonic Waveguide With Refractive Index Tuning - In a photonic waveguide, there is provided an undercladding layer and a waveguide core, having a cross-sectional height and width, that is disposed on the undercladding layer. The waveguide core comprises a waveguide core material having a thermo-optic coefficient. A refractive index tuning cladding layer is disposed on top of the waveguide core. The refractive index tuning cladding layer comprises a refractive index tuning cladding material having an adjustable refractive index and an absorption length at a refractive index tuning radiation wavelength. A thermo-optic coefficient compensation cladding layer is disposed on top of the refractive index tuning cladding layer. The thermo-optic coefficient compensation cladding layer comprises a thermo-optic coefficient compensation material having a thermo-optic coefficient that is of opposite sign to the thermo-optic coefficient of the waveguide core material. The thermo-optic coefficient compensation cladding layer provides at least partial compensation for the waveguide core thermo-optic coefficient. | 09-19-2013 |
20130272669 | OPTICAL FIBER - An optical fiber comprising a first core, a second core, a third core, and a cladding, wherein with a refractive index of the cladding as a reference, Δ1 is a maximum value of a relative refractive index difference of the first core, Δ2 is a maximum value of a relative refractive index difference of the second core, Δ3 is a minimum value of a relative refractive index difference of the third core, “a” is a half-value radial width for the relative refractive index difference (Δ1−Δ2) of the first core, “b” is a radius of a second core/third core boundary, and “c” is a radius of a third core/cladding boundary, the expressions 0.30%≦Δ1≦0.45%, −0.05%≦Δ2≦0.05%, −0.6%≦Δ3≦−0.3%, 2.85≦b/a, 10 μm≦b≦15 μm, and 3 μm≦c−b≦5.5 μm are satisfied, and transmission loss for a wavelength of 1550 nm when the optical fiber is wound around a mandrel with a diameter of 10 mm is no greater than 0.2 dB/turn. | 10-17-2013 |
20130272670 | LOW MACROBENDING LOSS SINGLE-MODE OPTICAL FIBRE - A single-mode transmission optical fibre includes a central core region radially outwardly from a centerline to a radius r | 10-17-2013 |
20130287353 | Hybrid Single-Mode and Multimode Optical Fiber - A hybrid optical fiber integrates features of multimode optical fibers and single-mode optical fibers. The hybrid optical fiber possesses an optical core having a first core region and a second core region to provide improved optical mode coupling ratio for single-mode transmission while maintaining a broad bandwidth for multimode transmission. The hybrid optical fiber's optical core may optionally include a depressed trench positioned between the optical core's first core region and the optical core's second core region to reduce modal dispersion and to improve modal bandwidth during multimode transmissions. | 10-31-2013 |
20130287354 | OPTICAL WAVEGUIDE - There are provided an optical waveguide including: a substrate | 10-31-2013 |
20130308913 | MULTICORE FIBER - A multicore fiber has a plurality of cores; and a clad which surrounds an outer peripheral surface of each of the cores, and at least one of the cores is spirally arranged such that the core rotates around a center axis of the clad. By arranging the cores in this way, it is possible to prevent crosstalk between specific cores from escalating even when the multicore fiber is disposed in a bent state. | 11-21-2013 |
20140010507 | MULTICORE FIBER - A multicore fiber includes a cladding and a plurality of core elements which is provided in the cladding and includes a core, an inner cladding layer that surrounds the core, and a low-refractive index layer that surrounds the inner cladding layer and has a lower average refractive index than the cladding and the inner cladding layer. The plurality of core elements is arranged such that a specific core element is surrounded by three or more core elements, and a low-refractive index layer of a partial core element of the plurality of core elements is configured to have larger light confinement loss in the core than low-refractive index layers of the other partial core elements. | 01-09-2014 |
20140029906 | OPTICAL FIBER AND OPTICAL TRANSMISSION SYSTEM - An optical fiber includes a core portion and a cladding portion that is formed on an outer periphery of the core portion and has a refractive index lower than a maximum refractive index of the core portion. Characteristics at a wavelength of 1550 nm are an effective core area of a fundamental propagation mode of equal to or larger than 120 μm | 01-30-2014 |
20140064687 | MULTI-CORE OPTICAL FIBERS WITH SINGLE MODE AND MULTIMODE CORE ELEMENTS - Multi-core optical fibers are disclosed herein. According to one embodiment, a multi-core optical fiber includes a common outer cladding formed from silica-based glass and having a cladding index of refraction n | 03-06-2014 |
20140086544 | OPTICAL FIBER - An optical fiber has a core region, a cladding region and at least one spacer layer disposed between the core region and the cladding region. The core region is positively doped and has a positive refractive index with respect to the glass matrix of the optical fiber. The cladding region is negatively doped and has a refractive index of at most zero with respect to the glass matrix. The numerical aperture of the optical fiber is composed of variable proportions of the positively doped core region and the negatively doped cladding region and results from the refractive indices of both regions. | 03-27-2014 |
20140119702 | OPTICAL WAVEGUIDE AND OPTICAL MODULE - An optical waveguide includes a first cladding layer, at least two core portions formed on the first cladding layer and extended in a first direction, at least two groove portions formed in each of the core portions at positions spaced apart from each other in the first direction, each groove portion having an inclined surface, an optical path conversion mirror formed on one of the inclined surfaces formed in each of the core portions, and a second cladding layer formed on the first cladding layer and the core portions. The optical path conversion mirrors formed in the core portions adjacent to each other are arranged at positions different from each other in the first direction. The groove portions formed in the core portions adjacent to each other are arranged at the same positions in the first direction. | 05-01-2014 |
20140161404 | Multicore Fiber Designs for Spatial Multiplexing - In an optical fiber, a plurality of individual cores extend through a common cladding. Each individual core supports at least one local transverse spatial mode. The individual cores and surrounding cladding are structured to support propagation of plurality of desired signal-carrying modes, while suppressing undesired modes, thereby supporting the propagation of one or more spatially multiplexed signals. The core-to-core spacing of the fiber is configured to maintain an acceptably low level of mode-coupling between cores. | 06-12-2014 |
20140161405 | SURFACE PLASMON OPTICAL WAVEGUIDE - A surface plasmon optical waveguide includes a lower cladding, a metal thin layer on the lower cladding, low-k dielectric layers spaced apart from each other on one surface of the metal thin layer, and an upper cladding covering the low-k dielectric layers and the metal thin layer uncovered between the low-k dielectric layers. A refractive index of the low-k dielectric layers is less than a refractive index of the lower and upper claddings. | 06-12-2014 |
20140178024 | MULTICORE FIBER FOR COMMUNICATION - A multicore fiber for communication | 06-26-2014 |
20140199039 | MULTI-CORE FIBER AND METHOD OF POSITIONING OF CORE OF MULTI-CORE FIBER - A multi-core fiber for accommodating multiple single mode cores in one optical fiber is provided with multiple types of non-identical cores having different propagation constants. Each of the multiple types of non-identical cores includes a core part and a cladding part covering an outer periphery of the core part. The cladding part has a double cladding structure including a first cladding for surrounding an outer periphery of the core part and a second cladding on the outer side of the first cladding. In the multiple types of non-identical cores, an optical electromagnetic profile in the core part and the first cladding is confined within a range of the core part and the first cladding, restricting a leakage thereof to the second cladding, and the propagation constant of each non-identical core is made different using the refractive index of the first cladding as a parameter. | 07-17-2014 |
20140212102 | POLARIZATION MAINTAINING OPTICAL FIBERS WITH INTRACORE STRESS MECHANISMS - Polarization maintaining optical fibers and methods for making the same are disclosed herein. According to one embodiment, a polarization maintaining optical fiber includes a cladding portion and a core portion disposed in the cladding portion. The core portion includes a first core region having a first coefficient of thermal expansion CTE1 and a second core region having a second coefficient of thermal expansion CTE2. The first coefficient of thermal expansion CTE1 is not equal to the second coefficient of thermal expansion CTE2. At least one of the first core region and the second core region is non-circular symmetric with respect to a centerline of the polarization maintaining optical fiber. | 07-31-2014 |
20140254997 | OPTICAL FIBER PREFORM, METHOD FOR PRODUCING OPTICAL FIBER, AND OPTICAL FIBER - An easily producible optical fiber preform which is drawn to an optical fiber having a core containing a sufficient concentration of alkali metal is provided. An optical fiber preform | 09-11-2014 |
20140301708 | LOW BEND LOSS OPTICAL FIBER - An optical fiber having both low bend loss. The fiber has a central core region having refractive index Δ | 10-09-2014 |
20140334789 | MULTI-CORE FIBER - A multi-core fiber includes an even number of six or more of cores and a clad that surrounds the outer circumferential surfaces of the cores. The cores are formed of two types of cores and in which an effective refractive index difference in a fundamental mode is 0.002 or less in a predetermined range or more that the effective refractive index difference in the fundamental mode is varied according to a core pitch. Two types of the cores are alternately and annularly disposed at regular spacings. A difference in the mode field diameter of light propagating through the cores is 1 μm or less. | 11-13-2014 |
20140369659 | FAN-IN/FAN-OUT DEVICE FOR MULTICORE FIBER - A fan-in/fan-out device includes a plurality of single-core fibers which are connected to a plurality of first cores of a multicore fiber and which include an elongated portion extending in a longitudinal direction so as to reduce a diameter and being connected to a first end portion of the multicore fiber at a second end portion in an extending direction of the elongated portion, where a refractive index distribution of each of the single-core fibers has a single peak, a relative refractive index difference of a second core with respect to a second cladding in each of the single-core fibers is 0.8% or more; and a second mode field diameter of the second end portion of the elongated portion is greater than a first mode field diameter of the first end portion of the multicore fiber. | 12-18-2014 |
20150016795 | OPTICAL COMPONENT AND OPTICAL COMMUNICATION SYSTEM - An optical component according to an embodiment of the present invention is constructed of a plurality of MCFs each having the same core constellation structure and among the plurality of MCFs, a maximum deviation of a core pitch between neighboring cores and a maximum deviation of a spot size of a fundamental mode at an operating wavelength satisfy a specific relation, thereby suppressing structural variation so as to keep a splice loss not more than 1 dB. | 01-15-2015 |
20150043878 | ALIGNMENT FOR SPLICING MULTI-CORE OPTICAL FIBERS - A multi-core optical fiber may include a cladding with a cross section having a central region and an outside diameter. Multiple transmission cores are arranged symmetrically within the central region of the cladding, extending parallel to a central axis of the multi-core optical fiber. Multiple alignment cores are arranged within the cladding, extending parallel to the central axis of the multi-core optical fiber and near the outside diameter of the cladding so that each of the multiple alignment cores are visible through a side view of the cladding. Ends of similarly configured multi-core optical fibers may be mated and aligned. Alignment cores of a first multi-core optical fiber may be aligned with alignment cores of a second multi-core optical fiber using a side view of the mating interface. Aligning the alignment cores causes multiple transmission cores with the multi-core optical fibers to also align. | 02-12-2015 |
20150055923 | METHOD FOR CONNECTING MULTI-CORE FIBER, MULTI-CORE FIBER, AND METHOD FOR MANUFACTURING MULTI-CORE FIBER - A multicore fiber | 02-26-2015 |
20150139597 | MULTICORE FIBER - A multicore fiber includes a plurality of cores and a cladding surrounding the plurality of cores. The plurality of cores is arranged and disposed on a linear line passed through the center of the cladding. A pair of cores is included. The pair of the cores is located adjacent to each other, and has different core diameters in a first direction in which the plurality of cores is arranged on the linear line. A ratio of a core diameter in the first direction to a core diameter in a second direction orthogonal to the first direction is different between the pair of the cores. | 05-21-2015 |
20150147040 | MULTICORE FIBER - A multicore fiber includes a plurality of cores, a cladding that encloses the plurality of the cores, and a marker disposed in the cladding. The plurality of the cores is arranged and disposed on a linear line passed through the center of the cladding. The marker is disposed along the length direction of the cladding on a portion on which the marker does not overlap the cores in a first direction in which the plurality of the cores is arranged on the linear line and does not overlap the core in a second direction orthogonal to the first direction. | 05-28-2015 |
20150323736 | MULTICORE FIBER AND METHOD OF MANUFACTURING THE SAME - A multicore fiber according to an embodiment of the present invention includes a plurality of cores and a cladding that encloses the plurality of the cores. The external form of the cladding in a cross section is formed of an arc portion that is formed in an arc shape relative to the center axis of the cladding and a non-arc portion that is pinched between two ends of the arc portion and not formed in an arc shape relative to the center axis of the cladding. The non-arc portion is formed with a pair of projections projecting from two ends of the arc portion on the opposite side of the center axis relative to a straight line connecting the both ends of the arc portion and one or more of recesses pinched between the pair of the projections. | 11-12-2015 |
20160004009 | MULTI-CORE FIBER - A multi-core fiber ( | 01-07-2016 |
20160011366 | MULTICORE OPTICAL FIBER AND MULTICORE OPTICAL FIBER CABLE | 01-14-2016 |
20160033719 | FEW-MODE OPTICAL FIBERS - Herein presents a few-mode optical fiber, wherein the core comprising a main core ( | 02-04-2016 |
20160187576 | MULTI-CORE FIBER - In a C band and an L band, the effective refractive indices of light propagating through the cores | 06-30-2016 |
20160187577 | MULTICORE FIBER - A multicore fiber | 06-30-2016 |
20170235042 | MULTICORE FIBER | 08-17-2017 |
20170235043 | MULTICORE FIBER | 08-17-2017 |
20170235059 | SELECTIVE UV CURING OF EPOXY ADJACENT TO OPTICAL FIBERS BY TRANSMITTING UV ENERGY THROUGH THE FIBER CLADDING | 08-17-2017 |
20190146149 | OPTICAL FIBER AND DEVICE FOR RELEASING MOLECULES | 05-16-2019 |