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:
Apr. 28, 2015
Filed:
Oct. 26, 2012
Applicant:
Fujitsu Optical Components Limited, Kawasaki-shi, JP;
Inventor:
Shuichi Yasuda, Sapporo, JP;
Assignee:
Fujitsu Optical Components Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B 10/04 (2006.01); H04B 10/50 (2013.01); H04B 10/548 (2013.01);
U.S. Cl.
CPC ...
H04B 10/50575 (2013.01); H04B 10/548 (2013.01);
Abstract
After a startup of an optical transmitter, a control is started in such a way that a modulation amplitude of a driving signal of a phase modulator is set as 0, and that an operational point of a bias voltage is set as the lowest point of light transmission characteristics of the phase modulator. When the operational point of the bias voltage reaches the lowest point, the modulation amplitude of the driving signal is gradually increased from 0 to 2Vπ.