Fujikura Limited

Nec Corporation

Tetsuo Nozawa

Kunihiko Fujiwara

Ryozo Yamauchi

Tetsuya Sakai

Akira Wada

Daiichirou Tanaka

Takanori Shimizu

Kazuhiko Kurata

Akito Nishimura

Yukio Hayashi

Ichiro Hatakeyama

Terutake Kobayashi

Kuniharu Himeno

Fumio Suzuki

Kazuhiko Aikawa

Shigefumi Yamasaki

Minoru Sawada

Nozomu Natori

Provided with a holding member main body having an upward U-shaped cross section and having a space to which a plurality of optical fiber ribbons can be accommodated in a laminated state; and a lid body having a downward U-shaped cross section, wherein latch structures that engage to each other when lid body covers holding member main body are provided at wall portions of lid body and holding member main body, the lid body includes an optical fiber ribbon pressing portion that presses the laminated optical fiber ribbons accommodated in holding member main body. Heating operation is not required unlike a heat shrinkable tube, and the optical fiber ribbons are held by only a simple operation of covering the lid body, so that the operation of holding the optical fiber ribbons in a laminated state is easily performed and readjustment of the position of the optical fiber ribbons in a longitudinal direction can be performed.

Optical fiber ribbon holding member, optical fiber ribbon holding method, and optical fiber ribbon bundle

An optical fiber ribbon holding member capable of readjusting a position of an optical fiber ribbon without requiring a heating operation is provided. A holding member main body that has a U-shaped cross section and a space to which a plurality of optical fiber ribbons can be accommodate in a laminated state, and a lid body an opening surface of which has a reverse U-shaped cross section are employed. A latch structure is formed on wall portions of a lid body and a holding member main body, and engages to each other when the lid body covers the holding member main body. Heating operation is not required, and the optical fiber ribbons are held by only a simple operation of covering the lid body, so that the operation of holding the optical fiber ribbons is easily performed and readjustment of the position of the optical fiber ribbons can be performed.

Optical fiber ribbon holding member, optical fiber ribbon holding method, optical fiber ribbon bundle and holding member fixture

An optical connector fitted upon a tip end portion of an optical fiber ribbon and disposed to face an optical input and output terminators which are installed upon a substrate, and which optically connects between optical fibers of the optical fiber ribbon and each of the optical input and output terminators. The optical connector includes a block shaped connector main body which is disposed to face the optical input and output terminators. The connector main body includes a hollow optical fiber holding portion for holding mainly a coating portion of an optical fiber which is led generally in parallel with the surface of the substrate, a plurality of optical fiber apertures into which the tip end vicinity of the optical fibers are inserted and fixed and a concave spot for changing the optical axis comprising a reflective surface for changing the optical axis and formed in front of an exit of the optical fiber apertures, which causes the optical axis direction of the optical fiber to face the optical input and output terminators.

Optical transceiver and optical connector

An optical transceiverincludes an optical devicewhich is provided upon a substrate, an optical connectorwhich is connected to an optical fiber, and a connector holderfor optically connecting together the optical device and the optical connector. The connector holderincludes an engagement meanswhich holds the optical connector. The engagement meansholds the optical connectorwhen the optical connectoris pressed in towards the substrate. The optical connectorsupports the optical fiberso that the optical axis of the optical fibersubtends a fixed angle with respect to the optical axis of the optical device. And the optical connectorincludes a mirrorfor optically connecting between the optical deviceand the optical fiber

An object of the present invention is to provide an optical connector capable of preventing impairment of PC connections by a hard sleeve during PC connection of optical connectors having a hard sleeve installed in engaging pin holes thereof. The optical connector has a ferrule formed with integrally molded plastic and having engaging pin holes, and a hard sleeve installed in the engaging pin holes and having a hardness that is higher than the plastic of the ferrule. The hard sleeve and the plastic of the ferrule surrounding this hard sleeve are polished so as to be lower than the coupling end surface, and the end of the hard sleeve does not protrude beyond the coupling end surface.

Optical connector

Polarized wave holding optical fiber, production method therefor,

A manufacturing method for erbium doped silica, having a soot formation process, in which a silica glass soot is deposited on a seed rod for forming a soot preform in a porous state on the seed rod, a dopant impregnation process, wherein the soot preform is impregnated with at least an erbium compound, and a preform formation process, wherein this soot preform impregnated with a dopant is heated and rendered transparent. The dopant impregnation process is provided with an operation in which the soot preform obtained in the soot formation process is dipped in a solution containing an erbium compound, an aluminum compound, and a phosphorus compound; this is then desiccated, and soot preform which is impregnated with the erbium compound, the aluminum compound, and the phosphorus compound is obtained.

Erbium-doped silica optical fiber preform

Solution doping of a silica preform with erbium, aluminum and phosphorus

The present invention is directed to an optical fiber comprising a core and a cladding layer wherein at least one of the constitutional parameters thereof changes along the longitudinal direction of the optical fiber. In order to present a useful optical fiber wherein the occurrence of a Brillouin scattering is prevented, an optical fiber having altered constitutional parameters is found to be effective. The constitutional parameters mean the parameters which determine the constitution of the optical fiber and is capable of influencing the condition of electromagnetic wave transmitting therethrough such as light or acoustic wave. The constitutional parameters include diameter of the core, index of refraction of the core, diameter of the optical fiber, composition of the glass, residual stress of the core. Some examples are disclosed about their manufacturing process and the test results. Much improvement was measured, especially in the use for a single mode optical fiber.

Optical fiber having a core with a repeatedly changing constitutional

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Sakura, Japan

Tetsuo Nozawa