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. 25, 2022
Filed:
Nov. 12, 2019
Nec Corporation, Tokyo, JP;
Takehiro Nakano, Tokyo, JP;
NEC CORPORATION, Tokyo, JP;
Abstract
Provided are an optical transmission line monitoring apparatus, an optical transmission line monitoring system, and an optical transmission line monitoring method capable of monitoring a plurality of optical transmission lines in parallel. A monitoring light output unit outputs monitoring lights with different frequencies to optical transmission lines. A local oscillation light source outputs a local oscillation light. An interference unit, to which return lights corresponding to the monitoring lights are input, configured to output an output light generated by interference between input lights and the local oscillation light. A conversion unit converts the output light into an electrical signal. A signal processing unit extracts, from the electrical signal, an intermediate-frequency signal based on each of the monitoring lights, and generates monitoring results of the optical transmission lines from the intermediate-frequency signal.