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:
Jul. 31, 2018
Filed:
Feb. 13, 2014
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Mitsuteru Yoshida, Yokosuka, JP;
Etsushi Yamazaki, Yokosuka, JP;
Seiji Okamoto, Yokosuka, JP;
Hiroyuki Uzawa, Atsugi, JP;
Kengo Horikoshi, Yokosuka, JP;
Koichi Ishihara, Yokosuka, JP;
Takayuki Kobayashi, Yokosuka, JP;
Yoshiaki Kisaka, Yokosuka, JP;
Masahito Tomizawa, Yokosuka, JP;
Naoki Fujiwara, Atsugi, JP;
Tomoyoshi Kataoka, Yokosuka, JP;
Kazushige Yonenaga, Yokosuka, JP;
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo, JP;
Abstract
An increase in circuit scale is suppressed and a phase variation caused in a transmission path or the like is compensated for. An optical transmission system includes: a pilot symbol detection unit which detects a plurality of pilot symbols intermittently inserted into a received complex electric field signal that is obtained through coherent detection for a received optical signal; an error signal computation unit which calculates a complex electric field error signal indicating a phase variation at each pilot symbol based on the pilot symbols detected by the pilot symbol detection unit and a predetermined reference symbol; a compensation electric field signal generation unit which estimates a phase variation between the pilot symbols in the received complex electric field signal using filter processing based on the complex electric field error signal calculated by the error signal computation unit; and a phase noise compensation unit which performs phase compensation for the received complex electric field signal based on the phase variation between the pilot symbols estimated by the compensation electric field signal generation unit.