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:
Jan. 01, 2002
Filed:
Nov. 24, 1997
Applicant:
Inventor:
Yasuhisa Taneda, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02F 1/035 ;
U.S. Cl.
CPC ...
G02F 1/035 ;
Abstract
An optical modulation apparatus is provided with an optical modulator a variable gain amplifying circuit connected to this optical modulator a detecting circuit and a gain control circuit A modulated input signal is entered into the variable gain amplifying circuit and the variable gain amplifying circuit amplifies this signal and delivers it to the optical modulator as modulation drive signal. The detecting circuit controls the variable gain amplifying circuit on the basis of the detected signal. This optical modulation apparatus manifests steady optical modulation characteristics even if the amplitude of modulated input signals or ambient temperature varies.