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:
Jun. 02, 1998
Filed:
Jun. 21, 1996
Applicant:
Inventors:
Shigeki Kitajima, Kawasaki, JP;
Hideaki Takano, Kokobunji, JP;
Toshihisa Tsukada, Musashiro, JP;
Hiroaki Inoue, Hidaka, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
385 16 ;
Abstract
An optical switch has an input optical waveguide and an output optical waveguide that are physically and optically separated from each other by a two-level crossing arrangement. The direction of optical signal propagation is switchable by a connecting optical waveguide to provide optical coupling between the input and output optical waveguides. Crosstalk and loss due to diffraction at each crossing are small, and insertion loss does not increase, even for a large-scale application.