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. 14, 2017
Filed:
Sep. 13, 2016
Nec Corporation, Tokyo, JP;
Makoto Shibutani, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
An interference cancellation device includes: an interference signal generation unit including a buffer circuit that accumulates a first digital signal, delays the first digital signal, and outputs the first digital signal as a second digital signal and a digital signal processing circuit that processes the second digital signal in such a way as to have the same optical characteristic change as a reflected light whose optical characteristic changes according to the characteristic of an optical fiber transmission path, wherein the reflected light is a light reflected at a reflection point of the path when a transmission signal light modulated by the first digital signal is transmitted through the path, and outputs the second digital signal as an interference signal; and a subtraction unit that subtracts the interference signal from a third digital signal obtained by converting a reception signal light into an electric signal and outputting the result.