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:
May. 24, 2022
Filed:
Jan. 06, 2021
Nec Corporation, Tokyo, JP;
Isao Tomita, Tokyo, JP;
NEC CORPORATION, Tokyo, JP;
Abstract
A light source () outputs a light (L). A branching unit () branches the light (L) output from the light source () into a first branched light (L) and a local oscillation light (LO). A modulator () modulates the first branched light (L) to output an optical signal (LS). A receiver () causes the local oscillation light (LO) to interfere with an optical signal (LS) to receive the optical signal (LS). An EDFA () amplifies the optical signal (LS) output from the modulator (). An excitation light source () outputs an excitation light (Le) exciting the EDFA () to the EDFA (). An optical attenuator () attenuates optical power of the optical signal (LS) amplified by the EDFA (). A control unit () controls attenuation of the optical signal (LS) in the optical attenuator (). The control unit () adjusts the attenuation of the optical signal (LS) and adjusts an output of the excitation light (Le) from the excitation light source ().