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:
Aug. 20, 2019
Filed:
Oct. 17, 2016
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Ntt Electronics Corporation, Yokohama-shi, Kanagawa, JP;
Kengo Horikoshi, Yokosuka, JP;
Mitsuteru Yoshida, Yokosuka, JP;
Seiji Okamoto, Yokosuka, JP;
Eiichi Hosoya, Yokosuka, JP;
Etsushi Yamazaki, Yokohama, JP;
Yasuharu Onuma, Yokohama, JP;
Tomohiro Takamuku, Yokohama, JP;
Naoki Miura, Yokohama, JP;
Sadayuki Yasuda, Yokohama, JP;
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo, JP;
NTT Electronics Corporation, Yokohama-shi, Kanagawa, JP;
Abstract
A coherent optical reception device includes a local oscillation laser that supplies laser light, a coherent optical reception front-end unit that receives a multi-level modulated optical signal, demodulates the optical signal on the basis of the laser light, and converts a demodulated optical signal into an electrical analog signal, an analog-to-digital converter that converts the analog signal into a digital signal, a compensation unit that compensates for an influence of dispersion due to a wavelength or a polarized wave of the optical signal and recovers a carrier phase of the digital signal, a constellation distortion compensation unit that compensates for constellation distortion of the multi-level modulation included in the digital signal in which an influence of dispersion is compensated for by the compensation unit, and an error correction decoding unit that performs error correction of the digital signal in which the constellation distortion is compensated for.