Nippon Telegraph and Telephone Corporation

Ntt Electronics Corporation

Tohru Matsuura

Tadayuki Imai

Kazuo Fujiura

Seiji Toyoda

Toshiaki Tamamura

Masahiro Sasaura

Shigekuni Sasaki

Etsu Hashimoto

Shinji Ando

Fumio Yamamoto

Yasuko Maruo

Mitsuo Usui

Makoto Shimokozono

Shinsuke Matsui

Nobuaki Matsuura

Yuzo Ishii

Toshiki Nishizawa

Fusao Shimokawa

Yuji Mitsuhashi

Shingo Uchiyama

Johji Yamaguchi

Koichi Hadama

Toshifumi Konishi

A light-shielding portion () shields the light spot of output light output toward a shunt position &#x3b1; by a projecting portion (). Hence, the output light output toward the shunt position &#x3b1; does not travel to an output port (). This allows to prevent crosstalk.

Optical switch

A movable beam () and a movable beam () each having one end fixed to a frame portion () of a mirror substrate () are provided inside the frame portion (). The movable beam () and the movable beam () each having one end fixed to a corresponding to one of two opposite inner sides of the frame portion () are aligned at a predetermined distance on the same line in the direction in which the two sides face each other. Each of the movable beam () and the movable beam () has the other end displaceable in the normal line direction of the mirror substrate () and therefore has a cantilever structure. A mirror () is arranged between the movable beam () and the movable beam () and connected to them via a pair of connectors ().

Micromirror device and micromirror array

The invention provides an optical waveguide material whose refractive index can be tailored without changing the ratio of Ta and Nb. An optical waveguide of this invention comprising an under-clad layerand a corethat is formed on the under-clad layerand has a higher refractive index than that of the under-clad layeris shown. For example, KTN (KTaNbO) is used as the core, and a material that is obtained by substituting at least one element selected from the group consisting of Zr, Hf, and Sn for a portion of one element of the constituent elements of KTN and has the same perovskite type crystal structure as KTN is used as the clad. The refractive index of KTN can be reduced considerably, and this controllability widens the degree of freedom in the design of optical waveguide devices.

Optical waveguide material and optical waveguide

A polyimide optical waveguide comprising a core made of polyimide whose refractive index is controlled to a predetermined value by electron beam irradiation, and a cladding set in contact with the core and having a refractive index lower than that of the core.

Polyimide optical waveguide and method of manufacturing the same

Polimide optical waveguide

Growing community of inventors

Kanagawa, Japan

Tohru Matsuura