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. 21, 2003
Filed:
Dec. 21, 2000
Applicant:
Inventors:
Kouichi Masuda, Hirakata, JP;
Hiroaki Yamamoto, Higashiosaka, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02F 1/035 ; G02F 1/01 ; H01S 3/10 ; H01S 3/13 ;
U.S. Cl.
CPC ...
G02F 1/035 ; G02F 1/01 ; H01S 3/10 ; H01S 3/13 ;
Abstract
In an optical transmission apparatus including an external optical modulator for modulating an optical carrier from a light source with an electrical signal, bias voltage applied to the external optical modulator is accurately adapted to fluctuations in optimal bias voltage due to DC drift. A bias voltage control circuit controls bias voltage applied by a bias voltage applier to an external optical modulator so as to minimize an amount of second order distortion included in an optical signal from the external optical modulator and caused by non-linearity thereof.