Fujitsu Corporation

Masahiro Iwama

Kohei Choraku

Daisuke Usui

Tetsuro Yamada

Takahiro Ooi

Osamu Kawai

An optical module includes an optical transmission device including a heating element, an optical element, an optical cable and an optical coupling unit that performs optical coupling between the optical element and one end of the optical cable; and a container that houses the heating element, the optical element, the optical coupling unit, and a portion including the one end of the optical cable, the container having an opening located between the heating element and the optical coupling unit in a direction in which the heating element and the optical coupling unit are arranged, the container having a portion located closer to the optical coupling unit than the opening in the arrangement direction wherein the portion is sealed.

Optical module and liquid immersion system

An optical module includes a light emitter array in which a plurality of light emitters are arranged, and a lens group which converges light beams output from the light emitter array, wherein in a stage where the light beams reach the lens group, planes of polarization of the light beams are different between adjacent light emitters.

Optical module and optical transceiver

An optical waveguide substrate includes: a substrate body in which an optical waveguide is formed; a cable holding part configured to have a cable holding hole into which a signal cable is inserted, the signal cable having one of an incidence part and an emission part that is arranged so as to face the optical waveguide and having a first magnetic part; and a second magnetic part configured to generate a repulsive force in the cable holding hole in association with the first magnetic part.

Optical waveguide substrate and information processing device

An electronic device includes a board including an electronic component, a plurality of optical interface units that include an optical element which input or output light and that are provided on the board, and a plurality of individual positioning units that position a plurality of respective optical waveguides which are separate from each other at least at tip portions on a side of the optical interface units and which are optically aligned with the optical element with respect to the optical interface units independently from each other.

Electronic device and optical connector

A method for manufacturing an optical transmission device, includes: arranging a plurality of optical waveguides including waveguide mirrors, a transmission-side optical module and a reception-side optical module on one side of a substrate; photographing, with a photographic device, at least one waveguide mirror, and the transmission-side optical module or the reception-side optical module corresponding to the waveguide mirror, from another side of the substrate via an opening formed in the substrate; detecting optical-axis centers of the transmission-side optical module or optical-axis centers of the reception-side optical module, and central positions of reflective surfaces of the waveguide mirrors corresponding to the detected optical-axis centers, from a result of the photographing; and aligning and fixing a position relationship between the optical waveguides and the transmission-side optical module or the reception-side optical module based on a result of the detecting.

Method and device for manufacturing optical transmission device, and optical transmission device

A disclosed optical semiconductor element includes: a semiconductor substrate having a first main surface and a second main surface in which a plurality of first grooves are formed; a first optical waveguide defined by portions of the semiconductor substrate between the first grooves and having side faces defined by the first grooves; and a photoelectric converter configured to transmit or receive an optical signal propagating through the first optical waveguide. Moreover, the first grooves define part of a guide hole.

Optical semiconductor element and method of manufacturing the same

Each of a plurality of redundantly formed semiconductor circuits integrally has a monitor transistor and is energized by being supplied with an enable signal. A monitor circuit associated with each semiconductor circuit detects a collector current of the monitor transistor and, when the collector current is less than a predetermined threshold value, outputs an alarm signal. A variation predicting circuit calculates the rate of change per unit time with respect to the collector current. An order determining circuit stores the identification numbers of the semiconductor circuits into an order determination register in descending order of the rate of change. The order determination register initially outputs the front identification number, and thereafter outputs the respective following identification number each time a respective one of the monitor circuits outputs an alarm signal. A semiconductor circuit selection decoder supplies an enable signal to the semiconductor circuit indicated by an identification number.

Switching device of semiconductor circuit and switching method of the same

A circuit for a matrix calculation of the discrete cosine transformation includes a read only memory, multipliers, summing devices, registers, selectors and a control unit. The multiplication and the summing calculations, with regard to one input data, are successively carried out by using a plurality of transformation coefficients of discrete cosine transformation read from the read only memory, row elements of the matrix of discrete cosine transformation are obtained by carrying out, a number of times equal to the number of row elements, the processes successively updating the registers based on the result of the calculations, and all the row and column elements of the matrix of discrete cosine transformation are obtained by carrying out, a number of times equal to the number of column elements, the calculations.

Growing community of inventors

Kawasaki, Japan

Masahiro Iwama