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:
Feb. 15, 2022
Filed:
May. 22, 2019
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Hiroki Kawahara, Tokyo, JP;
Hiroshi Yamamoto, Tokyo, JP;
Katsuhiro Araya, Tokyo, JP;
Yoshihiko Uematsu, Tokyo, JP;
Toshiyuki Oka, Tokyo, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
[Problem] It is possible to cancel out beat noises in a WDM signal to obtain a high-quality signal component, and a configuration thereof is achieved with low mounting costs. [Solution] An optical reception device converts a WDM signal rs(t) of an optical signal to electrical signals d(t)to d(t)n expressed as complex numbers of orthogonal phases, cancels out beat noises from the electrical signals, and then demodulates the signals to obtain signals Dto Dn of a transmission source. This optical reception device includes an absolute value calculation unitstothat generate a signal component including a beat noise component through absolute value squaring calculation processing for squaring an absolute value of the electrical signal, scaling unitstothat multiply the generated beat noise component by a proportional constant to restore beat noise associated with n types of wavelengths in the electrical signal, and subtraction unitstothat subtract the n type of beat noises restored from the electrical signal to cancel out then types of beat noises included in the electrical signal.