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:
Oct. 23, 2012
Filed:
Dec. 31, 2008
Katsumi Fukumitsu, Kawasaki, JP;
Katsumi Fukumitsu, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An optical receiver includes: delay interferometers respectively provided in at least two branches that branch a reception signal; a phase shift amount control device that controls a phase shift amount of the delay interferometer in accordance with an optical phase control value; a balanced optical detecting section that respectively photoelectrically converts respective branch signals output from the delay interferometers; a data regenerating section that regenerates transmission data from the photoelectrically converted branch signals output from the balanced optical detecting section; a control section that outputs the optical phase control value based on a signal of the data regenerating section; and a memory that stores therein the optical phase control value output from the control section at the time of signal communication, as a history of control values, wherein the control section refers to the history of control values during a signal communication operation to determine the optical phase control value.