Fujikura Limited

Yuu Ishii

Michihiro Nakai

Akira Wada

Naoki Kimura

Ryokichi Matsumoto

Satoshi Okude

Kensuke Shima

Daiichiro Tanaka

Kenji Nishide

Kunihiro Naoe

Susumu Saito

An electronic component mounting board, including: a substrate base made of a flat-plate-like elastic body, the substrate base having a plurality of through-holes in a manner spaced a predetermined distance apart from each other; conductive members, each of which has a main unit portion filled in the through-hole, the main unit portion having a first protrusion portion and a second protrusion portion respectively on a first end and a second end thereof, with the first protrusion portion arranged so as to protrude from a first surface of the substrate base and the second protrusion portion arranged so as to protrude from a second surface of the substrate base; a flexible substrate that is arranged on the first surface of the substrate base and that has first opening portions for penetration of the first protrusion portions; and a plurality of oval electrodes arranged on the substrate, each of which has a second opening portion for penetration of the first protrusion portion, in which the electrodes are arranged in a manner spaced apart from each other, and each of the second opening portions is formed on a first end side of each of the electrodes.

Electronic component mounting board, method for manufacturing the same and electronic circuit unit

An optical fiber coupler is comprised of a fusion-elongated portionin which an optical fiberwhich is designed and fabricated for use at a wavelength in the vicinity of 1.55 &#x3bc;m and an optical fiberwhich is designed and fabricated for use at a wavelength in the vicinity of 0.98 &#x3bc;m are fused and elongated. The propagation constant difference between optical fibersandis 10rad/&#x3bc;m or smaller.

Optical fiber coupler and optical fiber therefor

An object of the invention is to improve polarization dependence of insertion loss (PDL) in an ultraviolet light induced optical fiber grating. In the invention, in a method of manufacturing an optical fiber grating with a plurality of grating sections arranged intermittently at a predetermined period along the longitudinal direction, by irradiating, from the side of an optical fiber having locations made of a material wherein the refractive index rises when irradiated by light of a specific wavelength, light of this specific wavelength along the length direction of the optical fiber at a predetermined period, causing the refractive index of the irradiated sections to rise, high refractive index sections are formed by irradiating light evenly onto the optical fiber around the circumferential direction thereof.

Method and device for manufacturing optical fiber grating, optical fiber grating, optical module, and optical communication system

The invention provides a method and apparatus that precisely and efficiently improves the optical properties of an optical fiber grating. Preferably hydrogen loading processing, grating formation processing that forms a grating part by irradiation with ultraviolet light at a predetermined period, and preferably dehydrogenation, adjusting the optical properties by a suitable combination of uniform ultraviolet irradiation processing that irradiates the grating part as a whole with ultraviolet light and heat trimming processing, and finally heat aging is carried out.

Optical fiber grating, optical fiber grating manufacturing method, and optical fiber grating manufacturing apparatus

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Sakura, Japan

Yuu Ishii