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. 17, 2021
Filed:
Jul. 18, 2018
Applicant:
Sumitomo Electric Device Innovations, Inc., Yokohama, JP;
Inventor:
Ryota Teranishi, Yokohama, JP;
Assignee:
SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC., Kanagawa, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02F 1/01 (2006.01); H01S 5/50 (2006.01); H04B 10/291 (2013.01); H04B 10/524 (2013.01); H04B 10/54 (2013.01); H04B 10/293 (2013.01); H01S 5/0683 (2006.01); H01S 5/00 (2006.01);
U.S. Cl.
CPC ...
G02F 1/0121 (2013.01); H01S 5/0683 (2013.01); H01S 5/50 (2013.01); H04B 10/293 (2013.01); H04B 10/2914 (2013.01); H04B 10/524 (2013.01); H04B 10/541 (2013.01); G02F 2203/48 (2013.01); H01S 5/0085 (2013.01);
Abstract
A method of controlling an optical amplifying system that processes an optical signal with the PAM4 mode is disclosed. The optical amplifying system includes a variable optical attenuator (VOA) and a semiconductor optical amplifier (SOA). The VOA attenuates the optical signal such that a maximum optical power thereof corresponding to one of the physical levels of the PAM4 signal becomes equal to a preset optical level for which the SOA may be linearly operable. The SOA may amplify the thus attenuated optical signal with a fixed optical gain.