Yokogawa Electric Corporation

Shoujirou Araki

Akira Miura

Shinji Iio

Morio Wada

Tsuyoshi Yakihara

Masayuki Suehiro

Machio Dobashi

Shinji Kobayashi

Daisuke Hayashi

Takahiro Kudo

Takashi Mogi

Chie Sato

Sadaharu Oka

Katsuya Ikezawa

Yoshiyuki Asano

Yasukazu Akasaka

Shin-ichi Nakajima

Toshimasa Umezawa

An optical logic device performs a logic operation on a plurality of input light signals. The optical logic device has a photoelectric conversion portion, in which photoreceivers for receiving input light signals are provided in parallel, that outputs an electric signal obtained by adding up outputs of the photoreceivers, and a comparator that compares a voltage level of the electric signal outputted from the photoelectric conversion portion with a predetermined voltage level.

Optical logic device responsive to pulsed signals

In an optical switch, a carrier-accumulating layer in which injected carriers are accumulated is provided on a semiconductor substrate having a waveguide formed thereon so that injected effective carriers tend to be accumulated in an effective part, and the burden on a driving circuit is thus reduced to realize high-speed operation. At the same time, when a clad on the carrier injection side, of clad layers formed on both sides of the waveguide, is a second clad layer, and a clad on the substrate side is a first clad layer, a third clad layer is formed on the first clad layer to reduce propagation loss in the waveguide.

Optical switch

Growing community of inventors

Tokyo, Japan

Shoujirou Araki