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:
Jul. 07, 2015
Filed:
Apr. 12, 2011
Shun Chikamori, Tokyo, JP;
Shun Chikamori, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
An optical amplifier includes: an optical amplification unit implementing optical amplification on an optical signal input from an input end to output the amplified optical signal from an output end to a device through a transmission line; a branching unit branching light from the output end, where the light contains reflected-light or/and optical feedback; a photo-detector receiving the branched light and detecting optical level of the received light; and a control circuit reducing an amount of optical amplification of the optical amplification unit in case where the detected optical level becomes more than or equal to a first threshold. The control circuit normalizes the amount of optical amplification in case where a variation of the optical level detected by the photo-detector becomes less than or equal to a second threshold, where the variation of the optical level has been brought by the reduction of the amount of optical amplification.