Adamant Co., Ltd.

Denso Corporation

Adamant Namiki Precision Jewel Co., Ltd.

Masaru Sasaki

Hiroyuki Fujiwara

Kaoru Torii

Yoshihiro Konno

Tadahisa Iikubo

Mitsuhiko Mizuno

Ren Watanabe

Kiyoshi Kurosawa

Yoshiharu Hiroki

Provided is an optical branching/coupling device in which optical transmission quality is improved by preventing a reduction in optical transmission quality, the reduction being due, for example, to an optical waveguide core affecting a light of another optical waveguide core in the vicinity of a joining section of the two optical waveguide cores. This optical branching/coupling device includes: a first optical waveguide that is provided extending from one end side to other end side; a second optical waveguide that is provided extending on a separate route from the one end side to the other end side, the other end side of the second optical waveguide being joined to the other end side of the first optical waveguide; and a cladding layer that covers the periphery of the first optical waveguide and the second optical waveguide, wherein the first and second optical waveguides comprise a cured product of a photocuring resin.

Optical branching/coupling device and optical transmission/reception module

An optical-fiber assembly, optical coupling device and optical-fiber coupling device provided with optical-fiber assembly. In the optical-fiber assembly, damaging a fixing material is prevented by preventing clad mode light from being incident on the fixing material and direct incidence, on the fixing material; of laser light emitted from a light-emitting element or an optical-fiber is prevented to generate resistance to the emitted light. The optical-fiber assembly constitutes by at least an optical-fiber and capillary. The optical-fiber is inserted into the capillary and one optical-fiber end is protruded outside the capillary. The optical-fiber outer periphery and capillary are fixed using fixing material and ceramic material disposed to be in contact with the entire optical-fiber outer circumference and have predetermined contact length in the optical-fiber axial direction. The position at which the ceramic material is set in front of the position of the fixing material as viewed from one optical-fiber end.

Optical fiber assembly, optical coupling device, and optical fiber coupling device

Current measuring device keeps fluctuation range for the ratio error in output within &#xb1;0.5% range and simplified assembly thereof. The measuring device includes at least a light entrance and exit, optical fiber for a sensor, Faraday rotator, first and second &#xbc;-wavelength plates, polarization separator, light source, and signal-processing-circuit including a photoelectric-conversion-element. Optical fiber for a sensor has birefringence and includes one end wherein two circularly polarized light-beams having different rotation enter directions and another end reflects circularly polarized light-beams entered. Phase difference of two linearly polarized light-beams in the round-trip light path between two &#xbc;-wavelength plates is compensated, and the Faraday rotational angle when the Faraday rotator is magnetically saturated set to 22.5&#xb0;+&#x3b1;&#xb0; so fluctuation range for ratio error in measured value of the current to be measured is set in range, &#xb1;0.5%. The crystal-axes on optical faces of two &#xbc;-wavelength plates are set to be perpendicular or same direction.

Electric current measuring apparatus

Growing community of inventors

Kawaguchi, Japan

Masaru Sasaki