The Furukawa Electric Co., Ltd.

Kengo Watanabe

Tsunetoshi Saito

Katsuki Suematsu

Koichi Maeda

Ryuichi Sugizaki

Katsunori Imamura

Shunichi Matsushita

Mitsuhiro Iwaya

Yukihiro Tsuchida

Yoshiki Nomura

Masanori Takahashi

Hiroshi Matsuura

Noriyuki Yokouchi

Keiichi Aiso

Yu Mimura

Masahito Morimoto

Masato Shiino

Shigehiro Takasaka

Ryo Kawahara

Ryo Miyabe

Masayoshi Tsukamoto

Kohei Kawasaki

Shigeto Matsumoto

Kyosuke Yamauchi

An optical fiber bundle structure includes: a plurality of optical fiber core wires; and a capillary, wherein each of the optical fiber core wires includes a glass fiber portion including a core and a clad, and a resin coated portion, the glass fiber portions are inserted in the capillary, and d2/d1 is equal to or larger than 0.57 and smaller than 1, where d1 is a diameter of the core of each of the glass fiber portions in a rear end portion of the capillary and d2 is a diameter of the core of each of the glass fiber portions in a distal end portion of the capillary.

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

The present disclosure relates to an optical connector includes at least one optical fiber; and a lens element including at least one lens that couples light to an end face of the optical fiber. The distance FLh between the end face of the optical fiber and a vertex of the lens is expressed by the sum of the distance FL from the vertex of the lens to the focal point F positioned in a back face direction of the lens and the length δ between the end face of the optical fiber and the focal point F, and the length δ is longer than 10 μm.

Optical connector and optical connector connection structure

An optical fiber connection state determination system determines a state of connection between a first optical fiber configured to propagate a test light input from a light source and a second optical fiber in a connector configured to detachably connect an output side from which the test light is output in the first optical fiber and an input side of the second optical fiber to which the test light propagated by the first optical fiber and output from the first optical fiber is input, and includes: a measurement unit configured to measure an intensity of a reflected light reflected and propagating thorough the first optical fiber in the test light; and a determination unit configured to determine the state of connection between the first optical fiber and the second optical fiber in the connector based on the intensity measured by the measurement unit.

Optical fiber connection state determination system and optical fiber connection state determination method

An optical power transmission apparatus includes: a light emitting unit including a first optical gain generating means and a first light reflecting means; an optical fiber; a second light reflecting means; and a light receiving means. Further, the second light reflecting means is arranged nearer to the light receiving means than the optical fiber is, a first laser resonator is formed, between the first light reflecting means and the second light reflecting means, by optical connection between the first optical gain generating means and the optical fiber, and first laser light generated by the first laser resonator is configured to be incident on the light receiving means.

Optical power transmission apparatus

An optical probe includes: an optical fiber; a reflecting portion; and a traveling direction changing portion changing a traveling direction of a laser beam of a first wavelength that has transmitted through the reflecting portion to a direction different from a traveling direction before transmitting through the reflecting portion. Further, the traveling direction changing portion is configured by a bending structure having a structure in which a portion on a distal end side of the optical fiber is bent, and the reflecting portion is provided closer to a proximal end side of the optical fiber than the bending structure.

Optical probe, medical laser probe, and cauterization device

A return loss in an optical connector connection structure according to a lens scheme is reduced. An optical connector () according to this disclosure, includes: a plurality of optical fibers () arranged in an array; and a lens array plate () that includes a first principal surface () with a plurality of lenses () corresponding to the respective optical fibers being formed on this surface, and a second principal surface () joined to end faces () of the optical fibers so as to be opposed to the first principal surface and optically coupled to the optical fibers to which the respective lenses correspond, wherein at least one of the end faces of the optical fibers and the second principal surface is inclined from a plane () perpendicular to optical axes () of the optical fibers.

Optical connector, and optical connector connection structure

A plurality of holes are formed in a ferrule. The holes are at sites penetrated by the tips of optical fibers. An opening is formed in the upper surface of the ferrule and an internal housing section is exposed from the opening. The housing section is at a site at which an optical fiber holding member is housed. The optical fibers are held by the optical fiber holding member. The optical fibers are multi-core fibers. In other words, the optical fibers have a specified axis of symmetry in a cross-section vertical to the longitudinal direction of the optical fibers and have orientation relative to a rotation direction having the longitudinal direction as the axis thereof.

Multi-core connector, connector, and connector connection mechanism

This optical fiber connection structure connects a multicore fiber and a bundle structure bundling a plurality of optical fibers. The multicore fiber has a plurality of cores arranged in a lattice. The bundle structure includes closely packed optical fibers of the same diameter. The bundle structure is configured such that signal light optical fiber groups including signal light optical fibers and a dummy fiber group including dummy optical fibers are stacked in multiple layers. The signal light optical fiber groups are configured with the signal light optical fibers aligned in the mutually contacting direction. The signal light optical fiber groups and the dummy fiber group are stacked orthogonal to the alignment direction of the optical fibers constituting the respective fiber groups.

Optical fiber bundle structure and optical fiber connection structure

In the present invention, a connector structure comprises a multi-core fiber and a ferrule. The multi-core fiber comprises a plurality of cores and a cladding that surrounds the cores. The ferrule holds the multi-core fiber. A tip of the multi-core fiber protrudes from an end face of the ferrule. A relation &#x394;&#x2266;14.8/a is satisfied. In the formula, &#x394; (&#x3bc;m) is a difference between a maximum protrusion height and a minimum protrusion height from an end face of the ferrule in a reference circle at the tip of the multi-core fiber. The reference circle is a minimum circle that includes all mode field diameters of the plurality of the cores having a center of cross section of the multi-core fiber as its center. And a (&#x3bc;m) is a radius of the reference circle.

Connector structure and connector connection structure

A bundle structure is obtained by arranging optical fibers having equal diameters in a close-packed arrangement around the outer circumference of a center optical fiber. The optical fibers are signal light optical fibers that transmit signal lights. The optical fiber is a pump light optical fiber that transmits pump light. The number of optical fibers is equal to the number of cores in the multi-core fiber. The bundle structure and the multi-core fiber are connected to one another by adhering or fusing. The cores and the cores are optically connected, and the core and the cladding are optically connected. When connecting, the mode field diameter of the cores and the cores are substantially equivalent. In addition, the outer diameter (diameter of circumscribed circle including optical fibers) of the bundle structure is set so as not to be greater than the outer diameter of the multi-core fiber.

Optical-fiber-bundle structure, rare-earth-doped multi-core fiber, connection structure therefor, method for exciting rare-earth-doped multi-core fibers, and multi-core-optical-fiber amplifier

An optical connector is structured so as to include a fiber connection structure therein. A multi-core fiber is included inside a ferrule, and affixed to the ferrule substrate. One end surface of the multi-core fiber is exposed to an end surface of the ferrule. The other end of the multi-core fiber passes through and is affixed to a capillary. A plurality of optical fiber pass through a capillary that faces the capillary, and are affixed thereto the capillary in the same manner. Seven optical fiber cores of the same diameter are joined in a close-packed arrangement in the fiber connection structure.

Optical connector, method for aligning multi-core fiber with bundle structure, and fiber arrangement conversion member

A multicore fiberincludes a plurality of coresdisposed at predetermined intervals and surrounded by a cladding. The multicore fiberalso includes a markerformed apart from the cores. The refractive index of the markeris different from those of the coresand the cladding. For example, the markermay be made of a material having lower refractive index than that of the cladding. In this case, for example, the coresmay be made of germanium-doped quartz. The claddingmay be made of pure quartz. The markermay be made of fluorine-doped quartz. Further, the markermay be an empty hole.

Method for connecting multi-core fiber, multi-core fiber, and method for manufacturing multi-core fiber

A multi-core amplification optical fiber includes a plurality of rare-earth-doped core portions and a cladding portion positioned at an outer periphery of the core portions and having refractive index lower than those of the core portions. When a doping concentration of the rare-earth of each of the core portions is 250 ppm to 2000 ppm, a relative refractive index difference of each of the core portions relative to the cladding portion is 0.5% to 2% at a wavelength of 1550 nm, and a core diameter of each of the core portions is 1 &#x3bc;m to 5 &#x3bc;m, a separation distance between each of the core portions and adjacent one of the core portions is set at equal to or larger than 30 &#x3bc;m and at equal to or smaller than 60 &#x3bc;m so that a light-crosstalk between the adjacent core portions is equal to or lower than &#x2212;30 dB.

Multi-core amplification optical fiber and multi-core optical fiber amplifier

A multicore fiber has a plurality of cores formed at predetermined distances and surrounded by a cladding. A bundle structure includes optical fibers joined in a close-packed arrangement. Specifically, one optical fiber is arranged at a center, and six optical fibers are arranged around the optical fiber arranged at the center. Accordingly, cores of the optical fibers are arranged at equal distances. The optical fibers are bonded together with an adhesive. Accordingly, claddings of adjacent optical fibers are in contact with each other either directly or via the adhesive. The adhesive also fills spaces between the optical fibers.

Method for producing bundle structure including a plurality of optical fibers, method for connecting optical fibers, bundle terminal structure comprising capillary and optical fibers, and fiber connection structure comprising bundle terminal structure comprising capillary and optical fibers

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Tokyo, Japan

Kengo Watanabe