Sumitomo Electric Industries, Limited

Toshiki Taru

Takashi Sasaki

Shinji Ishikawa

Tetsuya Nakanishi

Ichiro Tsuchiya

Takuji Nagashima

Atsushi Inoue

Katsuya Nagayama

Kazuya Kuwahara

Eisuke Sasaoka

Masaaki Hirano

Masakazu Shigehara

Jonathan Cave Knight

Naoki Matsushita

Jun Ito

Akira Inoue

Tetsuya Haruna

Osamu Shimakawa

Masaki Ohmura

Yasuomi Kaneuchi

Kazunari Hattori

Katsuyuki Tsuneishi

Yuuichi Mitose

Nobuyuki Taira

Takeyuki Ishii

Tim Birks

David Bird

Tetsutarou Katayama

Masaki Oomura

Takahiro Kikuchi

In each of the plurality of optical fibers, a second diameter portion has a diameter larger than that of a first diameter portion. A tapered portion connects the first diameter portion and the second diameter portion by a tapered surface. In a fiber accommodating, a second accommodating portion has an inner diameter larger than that of a first accommodating portion. Each first diameter portion is located in the first accommodating portion. Each second diameter portion is located in the second accommodating portion. The second accommodating portion includes a plurality of regions divided by imaginary planes perpendicular to the first direction. The tapered portions of the optical fibers adjacent to each other among the plurality of optical fibers are located in the different regions among the plurality of regions.

Optical-fiber bundle structure, optical connection structure, and method of manufacturing optical-fiber bundle structure

An optical connection componentincludes an optical fiberhaving a bent portion BA, and a fiber fixing part. The optical fiberincludes a glass fiberand a resin coating. The fiber fixing partincludes an optical array memberand a protective resin. A distal end of the glass fiberand an end surface of the optical array memberform a reference surface S. The bent portion BA is formed in a region including the exposed glass fiber. A predetermined section in a region C, which continues from the bent portion BA on a side opposite to an end portion of the optical fibersupported by the fiber fixing partwith the bent portion BA interposed therebetween, is inclined to approach the reference surface S while going away from the bent portion BA.

Optical connection component

Optical fiber array

A preform manufacturing method of the present invention has a hole forming step of forming a plurality of holes in a glass body to produce a glass pipe, and a heating integration step of heating the glass pipe with core rods including core portions being inserted in the respective holes, thereby to implement integration of the core rods and the glass pipe. In the hole forming step, a peripheral hole out of the holes to be formed in the glass body is formed at a position determined in consideration of positional variation of the core portion before and after the integration.

Preform manufacturing method

A multi-core optical fiber ribbon easily optically connected to another optical component is provided. A multi-core optical fiber ribbonincludes a plurality of multi-core optical fibersarranged parallel to one another and a common resin, with which the plurality of multi-core optical fibersare collectively coated. A core arrangement direction in which plurality of cores in each of the plurality of multi-core optical fibersare arranged is parallel to or perpendicular to the fiber arrangement direction in which the plurality of multi-core optical fibersare arranged at least at both ends of the multi-core optical fiber ribbon

Multi-core optical fiber tape

There is provided a multi-core fiber that can reduce both skew and crosstalk between cores. The multi-core fiber includes a plurality of cores extending along a fiber axis, and optical claddings surrounding the plurality of cores. The skew between optical signals propagating through the plurality of cores is 1 ps/m or less, and the propagation constant difference between two adjacent cores of the plurality of cores is more than 0.

Multi-core fiber

A multi-core optical fiberA in which a plurality of cores can easily be identified even in the case where they are symmetrically arranged in its section has seven coresto, a visual recognition marker, and a shared claddingenclosing the seven corestoand the visual recognition marker. The coresto, the visual recognition marker, and the claddingare respectively made of silica glass as their main element. The corestoand the visual recognition markerextend along the fiber-axis direction. The respective refractive index of the corestois higher than the refractive index of the cladding. The refractive index of the visual recognition markerdiffers from that of the cladding. In the cross-section perpendicular to the fiber-axis, the corestoare arranged such that they have 6-fold rotational symmetry and line symmetry. The visual recognition markeris arranged at a position which breaks such symmetry.

Multi-core optical fiber

All solid photonic bandgap optical fiber comprising a core region and a cladding region is disclosed. The cladding region surrounding the core region includes a background optical material having a first refractive index and elements arranged in a two-dimensional periodic structure. In one embodiment, each of the elements comprises a center part and peripheral part having a higher refractive than the central part. In other embodiments, each element comprises a plurality of rods having a higher refractive index higher than the fist, the rods of each element arranged in a circle or polygon. Light transmission apparatus and methods of using the fiber are also disclosed.

All solid photonic bandgap fiber

A multi-core optical fiberA in which a plurality of cores can easily be identified even in the case where they are symmetrically arranged in its section has seven coresto, a visual recognition marker, and a shared claddingenclosing the seven corestoand the visual recognition marker. The corestoand the visual recognition markerextend along the fiber-axis direction. The respective refractive index of the corestois higher than the refractive index of the cladding. The refractive index of the visual recognition markerdiffers from that of the cladding. In the cross-section perpendicular to the fiber-axis, the corestoare arranged such that they have 6-fold rotational symmetry and line symmetry. The visual recognition markeris arranged at a position which breaks such symmetry.

Multi-core optical fibre

Highly accurate measurement of chromatic dispersions of a device under test that is an optical component is enabled with a simple structure comprising: propagating pump light having a wavelength &#x3bb;and probe light having a wavelength &#x3bb;probe through the device; calculating the generation efficiency of the idler light with respect to the wavelength &#x3bb;by measuring the power of idler light having a wavelength &#x3bb;output from the device according to four-wave mixing generated in the device; seeking the frequency difference or wavelength difference between the pump light and the probe light that makes an extremum of generation efficiency of the idler light; calculating phase mismatch among the pump light wavelength having such frequency difference or wavelength difference, the probe light wavelength, and the idler light wavelength; and on the basis of such calculation results, calculating the chromatic dispersion of the device at the wavelength &#x3bb;.

Apparatus and method for measuring chromatic dispersion

The chromatic dispersion of an optical component is measured with high accuracy using a simple set-up, which includes a pump light source, a probe light source, and a measuring means. Pump light having a wavelength &#x3bb;and probe light having a wavelength &#x3bb;is propagated through an optical component, with the wavelength &#x3bb;being apart from the wavelength &#x3bb;by a given frequency. The generation efficiency of the idler light with respect to the wavelength &#x3bb;is calculated by measuring the power of idler light having a wavelength &#x3bb;output from the optical component, and by seeking the pump light wavelength for making the generation efficiency a local extreme value, the chromatic dispersion of the optical component is calculated from the result of calculation of phase mismatch among the pump light wavelength having such wavelength as sought, the corresponding probe light wavelength, and the corresponding the idler light wavelength.

A photonic bandgap optical fiber and a method of manufacturing said fiber is disclosed. The photonic bandgap fiber comprises a core region surrounded by cladding region. The cladding region includes a background optical material having a first refractive index, and elements of optical material having a second refractive index higher than said first refractive index. The elements are arranges periodically in the background optical material. At the drawing temperature of the fibered, the background optical material has a viscosity lower than the viscosity of the optical material of the elements.

Photonic bandgap fiber

An optical transmission system comprising a laser light source arranged to emit light having a frequency &#x3c9;; and an optical transmission line adapted to guide the light, wherein said optical transmission line includes a photonic bandgap optical fibre having a core guided mode at frequency &#x3c9; and an attenuation band at a frequency of &#x3c9;-13 THz. The optical transmission system suppresses Raman scattered light thereby allowing high optical powers to be transmitted through optical fibre.

Optical power delivery system

The present invention relates to an optical fiber having a structure which allows further improvements to be made both in terms of lower reflectance and narrower bandwidth, and to a fiber grating type filter including the optical fiber. The optical fiber applied to the fiber grating type filter comprises a core region extending along a predetermined axis, and a cladding region provided on an outer periphery of the core region. The core region does not contain any photosensitive dopant which contributes to predetermined wavelength light photosensitivity as a glass property, but a part of the cladding region contain such a photosensitive dopant. By means of this composition, it is possible to form a grating, which has a grating plane slanted by a predetermined angle with respect to the optical axis, in a part of the cladding region surrounding the core region.

Optical fiber and fiber grating type filter including the same

A method produces a glass body that contains a reduced amount of OH groups in the metallic-oxide-containing glass layer and that has a reduced amount of transmission loss due to OH groups when the glass body is transformed into an optical fiber. The production method produces an optical glass body. An optical fiber contains the optical glass body in at least one part of its region for guiding a lightwave. The production method includes the following steps: (a) introducing into a glass pipe a gas containing an organometallic compound and a glass-forming material; (b) decomposing the organometallic compound into an organic constituent and a metallic constituent; (c) heating and oxidizing the metallic constituent so that produced glass particles containing a metallic oxide are deposited on the inner surface of the glass pipe to form a glass-particle-deposited layer; and (d) consolidating the deposited layer to form a metallic-oxide-containing glass layer.

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Yokohama, Japan

Toshiki Taru