The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 04, 2000
Filed:
Jan. 07, 1998
Naoki Ooba, Mito, JP;
Toshio Watanabe, Yokosuka, JP;
Takashi Kurihara, Mito, JP;
Saburo Imamura, Mito, JP;
Shoichi Hayashida, Hitachinaka, JP;
Toshiaki Tamamura, Atsugi, JP;
Tetsuyoshi Ishii, Isehara, JP;
Yasuyuki Inoue, Mito, JP;
Seiji Toyoda, Hitachinaka, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
In a digital thermo-optic switch and an optical ADM filter of the present invention, functional components such as a splitter and a grating structure part formed in the course of an optical circuit as a component are composed of silicone materials which are superior in heat resistance, reduced loss, and low birefringence, thereby achieving sufficiently practical thermal stability, low loss at 1.55 to 1.58 .mu.m band, wavelength selectivity, and cost reduction.