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. 12, 2013
Filed:
Jan. 14, 2008
Yuichi Akiyama, Kawasaki, JP;
Hideyuki Miyata, Kawasaki, JP;
Toshiki Tanaka, Kawasaki, JP;
Masato Nishihara, Kawasaki, JP;
Yuichi Akiyama, Kawasaki, JP;
Hideyuki Miyata, Kawasaki, JP;
Toshiki Tanaka, Kawasaki, JP;
Masato Nishihara, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
The disclosed optical transmitter and control method include performing phase modulation of a light propagating through a corresponding optical path in accordance with a data signal, supplying bias voltages for regulating an operating point of each of phase modulation performed, imparting a predetermined phase difference, supplying bias voltages for phase difference regulation and coupling lights output from the corresponding optical paths. The optical transmitter includes superimposing a pilot signal on either one of bias voltages where the pilot signal has a frequency lower than a frequency of a bit rate of the data signal, and performing a feedback control in accordance with a result of monitoring.