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:
Aug. 14, 2018
Filed:
Jan. 27, 2016
Sumitomo Electric Device Innovations, Inc., Yokohama-shi, JP;
Ryota Teranishi, Yokohama, JP;
Sumitomo Electric Device Innovations, Inc., Yokohama-shi, JP;
Abstract
A method to control an amplifying unit including a variable optical attenuator VOA and a semiconductor optical amplifier SOA is disclosed. The method first sets the attenuation of the VOA in a value realizable in the VOA and the optical gain of the SOA in a value where the SOA may operate in an optimum range. The method then gradually reduces the attenuation of the VOA as detecting the intensity of the beam output from the amplifying unit. When the intensity is still less than a target one even when the VOA shows no attenuation, the optical gain of the SOA is gradually increased to a value by which the intensity of the output beam becomes the target one.