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. 05, 2013
Filed:
Mar. 25, 2009
Masahito Mure, Toda, JP;
Norikazu Miyazaki, Narashino, JP;
Toshio Kataoka, Chiyoda-ku, JP;
Kaoru Higuma, Yachiyo, JP;
Masahito Mure, Toda, JP;
Norikazu Miyazaki, Narashino, JP;
Toshio Kataoka, Chiyoda-ku, JP;
Kaoru Higuma, Yachiyo, JP;
Sumitomo Osaka Cement Co., Ltd., Chiyoda-ku, Tokyo, JP;
Abstract
Provided is an optical receiver which accurately demodulates an optical signal obtained by the differential phase shift modulation method. The optical receiver includes: an interferometer which branches the inputted optical signal into two parts and gives a one-bit phase difference to the resultant two optical signals so that the two optical signals after addition of the phase difference are made to interfere each other to output two output lights; reflection means which reflects one of the output lights from the interferometer so as to return to the interferometer; detection means which detects the return light which has been reflected by the reflection means and propagates through the interferometer in the different direction from the inputted optical signal, for output; and phase difference control means which adjusts the phase difference given by the interferometer according to the intensity of the return light detected by the detection means.