Fujitsu Corporation

Daisuke Usui

Kohei Choraku

Masahiro Iwama

Tetsuro Yamada

Takahiro Ooi

Makoto Suwada

Manabu Yamazaki

Yoshiharu Yoshizawa

Shigeki Kawaai

Megumi Tanaka

An optical transmitter includes an optical modulator that includes a first phase shifter for a most significant bit, a second phase shifter for a least significant bit, and a third phase shifter for fine adjustment, the first phase shifter, the second phase shifter, and the third phase shifter are disposed along an optical waveguide, and a drive circuit that includes a first driver that drives the first phase shifter, a second driver that drives the second phase shifter, and a third driver that drives the third phase shifter, wherein a drive polarity of the third driver is adjustable in a positive direction and a negative direction, and the third phase shifter adjusts an amount of phase change of the optical modulator in a positive direction or a negative direction based on a drive voltage inputted from the third driver.

Optical transmitter

A circuit board includes: a first surface and a second surface opposite to the first surface; a through hole extending between the first surface and the second surface; a conductor covering an inner wall surface of the through hole, a first end and a second end of the conductor being terminated inside the through hole; and a wire connected to the conductor, wherein a sum of a length from a contact portion where the conductor contacts a connector pin inserted in the through hole to the first end of the conductor, and a length from a wire connecting portion where the conductor is connected to the wire to the second end of the conductor is 0.5 mm or less.

Circuit board, electronic device, and method of manufacturing circuit board

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 memory includes a control layer that includes a first radio communication unit that performs radio communication and a control unit that controls the radio communication; and a memory layer that includes a second radio communication unit that performs the radio communication with the first radio communication unit and a first storage unit that stores information, the memory layer being provided on the control layer.

Memory including wireless communication capability

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.

Growing community of inventors

Kawasaki, Japan

Daisuke Usui