Sumitomo Electric Industries, Limited

Maki Ikeji

Atsushi Inoue

Masaaki Hirano

Tetsuya Nakanishi

Yasushi Fujimura

Tetsuya Haruna

Kazuhito Saito

Masumi Ito

Mitsuaki Tamura

Akira Haraguchi

Tadashi Enomoto

Hiroshi Kohda

Eiichiro Yamada

Takeo Komiya

An optical fiber having excellent strength that can be manufactured at low cost, as well as a method for making such optical fiber, is provided. An optical fiberis a silica-based optical fiber comprising a core, an optical claddingsurrounding the core, and a jacketing regionsurrounding the optical claddingand having a uniform composition throughout from the internal circumference to the outer circumference. A compressive strained layer having a residual compressive stress is provided at the outermost circumference of the jacketing region

Optical fiber and method of manufacturing optical fiber

An optical spliceraccording to an embodiment of the present invention has a plurality of optical fibers, and an optical splice memberhaving a plurality of fiber holesin each of which a portion including one endof each fiberis inserted, and a mode field diameter Win one endof optical fiberis enlarged relative to a mode field diameter Win the other portion of optical fiber

Optical splicer, optical module, and method of producing optical splicer

An optical devicehas a substrate, whereas bare fibersexposed from a coated optical fiber tapeby removing a coatingfrom its middle part are secured to the upper face part of the substrate. In the substrate, a transverse grooveis formed obliquely with respect to an axis of the bare fibersso as to traverse core partsof the bare fibers. An optical memberfor reflecting a part of signal light transmitted through the bare fibersis inserted in the transverse groove. A support memberis provided on the upper side of the bare fibers, whereas a support surfaceof the support memberis provided with photodetectorsfor detecting light reflected by the optical member. The support surfaceof the support memberis inclined with respect to the upper face of the substrate, whereby the light entrance surfaceof each photodetectoris inclined by a predetermined angle with respect to the upper face of the substrate. Such a configuration realizes an optical device which can lower the polarization dependence of received light in the photodetectors.

Optical device

This invention relates to an optical fiber grating and a method of manufacturing the same. According to the method, a hydrogen doping process is performed before ultraviolet irradiation in order to obtain a sufficient photoinduced refractive index change. In particular, a target for the hydrogen doping process of the method is characterized by a coated fiber obtained by covering the outer surface of the bared fiber having a core region and a cladding region with the resin. After the coated fiber is exposed in a hydrogen atmosphere in a predetermined pressurized state for a predetermined period of time, the resin is partially removed. An ultraviolet ray is irradiated on the predetermined area of the bared fiber from which the resin is removed, thereby forming a reflection grating in the core region. The method is also characterized in that the pressure of the hydrogen atmosphere is reduced from the pressurized state while adjusting the pressure reducing rate. Degradation of the bared fiber surface can be prevented, and generation of bubbles or the like between the bared fiber and the resin coating can also be prevented, thereby obtaining an optical fiber grating with high reliability.

Optical fiber grating and method of manufacturing the same

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Yokohama, Japan

Maki Ikeji