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:
Dec. 11, 1990
Filed:
Nov. 14, 1988
Applicant:
Inventor:
Takahiro Numai, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
35016211 ; 3501622 ;
Abstract
A tunable wavelength filter comprises a plurality of distributed feedback sections and a phase-control section provided between the distributed feedback sections. The bandgap energy of the phase-control section is greater than that of the distributed feedback sections. In the tunable wavelength filter, electric current injected into the phase-control section is controlled to vary the optical length, so that light having a predetermined wavelength is transmitted through the tunable wavelength filter.
Quick Actions:
Numai, Takahiro. (1990). Tunable wavelength filter (U.S. Patent No. 4976513). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4976513
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile