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. 19, 2010
Filed:
Dec. 06, 2006
Toshiki Honda, Kawasaki, JP;
Kazuhiro Kunimatsu, Kawasaki, JP;
Takeshi Ono, Kawasaki, JP;
Katsumi Fukumitsu, Kawasaki, JP;
Masakazu Ozaki, Kawasaki, JP;
Toshiki Honda, Kawasaki, JP;
Kazuhiro Kunimatsu, Kawasaki, JP;
Takeshi Ono, Kawasaki, JP;
Katsumi Fukumitsu, Kawasaki, JP;
Masakazu Ozaki, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An optical signal, which is a low-speed signal superimposed on a high-speed phase modulated optical signal by intensity modulation, is used. In an optical receiver apparatus, a received signal is split, and one of the split signals is O/E converted and low frequency component alone is extracted via a filter. A clock is extracted from low-frequency component by CDR, and is compared with a preset frequency. Using the frequency difference obtained, dispersion compensation is performed with low accuracy. Next, the amount of phase control of the delay interferometeris adjusted so that the amplitude of the electrical signal is maximized. An error rate is measured, and fine adjustment is performed to improve the error rate.