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:
Feb. 06, 1990
Filed:
May. 02, 1988
Haruhito Shimizu, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A polarization controller comprises a plurality of devices connected in series to each other. Each device includes an optical channel waveguide which is common to the plurality of the devices, and an electrode positioned on the optical channel waveguide and two electrodes positioned on both sides of the optical channel waveguide. A retardation induced by electrooptic effect in each device is adjusted by voltages applied to the electrode and the two electrodes. The voltages are not kept increasing or decreasing, but changed periodically so that there is no limitation in an operating range for controlling a polarization of light which is propagated through the optical channel waveguide.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile