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:
Dec. 17, 2013
Filed:
Jan. 04, 2011
Ryutaro Takei, Yokohama, JP;
Takeshi Irie, Yokohama, JP;
Tomoki Ito, Yokohama, JP;
Kazuhisa Ozaki, Yokohama, JP;
Masatsugu Togasaki, Yokohama, JP;
Ryutaro Takei, Yokohama, JP;
Takeshi Irie, Yokohama, JP;
Tomoki Ito, Yokohama, JP;
Kazuhisa Ozaki, Yokohama, JP;
Masatsugu Togasaki, Yokohama, JP;
Sumitomo Electric Device Innovations, Inc., Kanagawa, JP;
Abstract
New method to control the optical transmitter is disclosed. The optical transmitter provides both of the ATC feedback loop and the APC feedback loop. When a failure occurs in the ATC feedback loop and the temperature sensor is unable to output an adequate signal any longer, the optical transmitter cuts the APC loop and operates the LD in constant conditions. The output of the monitor PD is transferred to the ATC loop to control the TEC based on the optical output of the LD.