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:
Oct. 30, 2018
Filed:
Feb. 03, 2015
Mitsubishi Electric Corporation, Chiyoda-ku, JP;
Eitetsu Igawa, Chiyoda-ku, JP;
Satoshi Ishitobi, Chiyoda-ku, JP;
Mitsubishi Electric Corporation, Chiyoda-ku, JP;
Abstract
An optical transmitter includes a semiconductor laser, a thermoelement that is connected with the semiconductor laser and that heats or cools the semiconductor laser, a thermistor that detects the temperature of the semiconductor laser via the thermoelement, a laser drive circuit that drives the semiconductor laser, a thermoelement driving circuit that acquires information about the temperature of the semiconductor laser from the thermistor, and that controls a current flowing through the thermoelement in such a way that the temperature detected by the thermistor becomes equal to a set value, and a controller that varies the set value on the basis of monitor current information outputted from the semiconductor laser, the temperature information about the semiconductor laser which is notified from the thermistor, and laser driving current information notified from the laser drive circuit.