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:
Mar. 10, 2020
Filed:
Jan. 18, 2017
Nec Corporation, Tokyo, JP;
Sadao Fujita, Tokyo, JP;
NEC CORPORATION, Minato-ku, Tokyo, JP;
Abstract
An optical transmitter includes optical modulation means for modulating a laser beam with a driving signal and outputting an optical signal; monitor means for detecting a part of the optical signal and outputting a monitor signal; bias voltage applying means for applying, to the optical modulation means, a bias voltage on which a dither signal is superimposed; average optical intensity detection means for detecting an average optical intensity of the optical signal from the monitor signal; top dither signal detection means for detecting, from the monitor signal, a top dither signal that is superimposed on a waveform with maximum optical intensity included in the optical signal; and bias voltage control means for controlling the bias voltage based on the average optical intensity and the top dither signal.