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:
Nov. 06, 2018
Filed:
Jun. 03, 2016
Applicant:
Fujitsu Optical Components Limited, Kawasaki-shi, Kanagawa, JP;
Inventor:
Hiroshi Nishimoto, Sagamihara, JP;
Assignee:
FUJITSU OPTICAL COMPONENTS LIMITED, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B 10/10 (2006.01); H04B 10/08 (2006.01); H04B 10/516 (2013.01); H04B 10/564 (2013.01); H04L 5/00 (2006.01); H04B 10/50 (2013.01); H04L 27/00 (2006.01); H04L 27/20 (2006.01); H04L 27/36 (2006.01); H04L 27/18 (2006.01);
U.S. Cl.
CPC ...
H04L 5/0048 (2013.01); H04B 10/5053 (2013.01); H04B 10/50572 (2013.01); H04B 10/50575 (2013.01); H04L 5/0008 (2013.01); H04L 27/0008 (2013.01); H04L 27/2096 (2013.01); H04L 27/36 (2013.01); H04B 2210/075 (2013.01); H04L 27/18 (2013.01);
Abstract
An optical transmitter has an optical modulator with a Mach-Zehnder interferometer, a pilot signal generator configured to generate a pilot signal to be superimposed on a drive signal for driving the optical modulator or on a substrate bias voltage applied to the optical modulator, and a controller configured to detect a ratio between a pilot component and a direct current component contained in a light output from the optical modulator and control at least one of an amplitude of the drive signal and a level of the substrate bias voltage such that the ratio becomes a constant value.