Fujikura Limited

Kenichi Ohmori

Kentaro Ichii

Osamu Nakao

Koji Omichi

Hitoshi Uemura

Norihiro Ishikura

Tatsuya Kishi

Tomoyuki Fujita

Rintaro Kitahara

Takuya Aizawa

Shingo Matsushita

Ken Katagiri

Miyako Gohara

Keiichiro Hata

Provided is a method of manufacturing an optical device that includes a multicore fiber including a plurality of cores and a fan-in/fan-out device including single-core fibers that are respectively connected to the cores based on a plurality of connection combinations when the multicore fiber is rotated. The method includes: a first step of determining an optical loss for each of the cores while changing the connection combinations between the single-core fibers and the cores; and a second step of selecting one of the connection combinations according to a result of the first step and connecting an end portion of the multicore fiber and an end portion of the fan-in/fan-out device to connect the single-core fibers with the cores based on the one of the connection combinations.

Method for manufacturing optical device

A manufacturing device of an optical fiber grating to write a grating in a core of an optical fiber by irradiating the optical fiber with laser light includes: a fixing device that fixes the optical fiber to at least one of a first position located more on an upstream side and a second position located more on a downstream side in a conveyance direction of the optical fiber than a laser light irradiating position of the optical fiber in a case of writing the grating; and a feeder having a structure capable of linearly reciprocating in the conveyance direction and adapted to feed a predetermined length of the optical fiber in the conveyance direction in a case where a fixed state of the optical fiber by the fixing device is released.

Manufacturing device and manufacturing method of optical fiber grating

An optical fiber sensor includes: a central core disposed at a center of an optical fiber; and an outer peripheral core that spirally surrounds the central core. The effective refractive index nof the outer peripheral core is lower than the effective refractive index nof the central core. A ratio between the effective refractive index nand the effective refractive index nmatches a ratio between an optical path length of the central core and an optical path length of the outer peripheral core.

Optical fiber sensor

Provided is an optical coupler configured to cause an NA of light, which exits a taper fiber, to be smaller as compared with a conventional optical coupler. A taper fiber has a high refractive index part which is provided inside a core of the taper fiber and which has a refractive index smaller than a refractive index nof the core. An exit end surface of each GI fiber is bonded to an entrance end surface of the taper fiber so that at least a part of the exit end surface of the each GI fiber overlaps with a section of the high refractive index part. A relative refractive index difference of the taper fiber is smaller than 0.076%.

Optical coupler, laser device, and taper fiber

A magnetic sensor drive circuit that measures a magnetic field by passing a feedback current, which cancels changes in magnetic flux density using measured magnetic field, through a prescribed coil. The drive circuit includes: a first circuit block which controls the feedback current by using an external power source as a power source; a second circuit block which has an output adjustment circuit adjusting a signal according to the strength of the feedback current to be a signal proportional to the voltage of the power source; a first power source line which supplies the external power source to the first circuit block; a second power source line which supplies the external power source to the second circuit block in parallel to the first power source line; a first low pass filter; and a second low pass filter.

Magnetic sensor drive circuit, magnetic sensor, current sensor, and method for driving magnetic sensor

Provided is a flux gate sensor comprising the following: a magnetic core having a first wiring layer formed on a board, a first insulating layer formed in such a way as to cover the aforementioned first wiring layer, and a magnetic core which is formed on the aforementioned first insulating layer and which has a central portion and an end portion that continues to the aforementioned central portion, that has a width larger than the width of the aforementioned central portion, and that is located on either side of the aforementioned central portion; a second insulating layer which covers the aforementioned magnetic core and which is formed on the aforementioned first insulating layer; and a second wiring layer formed on the aforementioned second insulating layer.

Growing community of inventors

Sakura, Japan

Kenichi Ohmori