Mitsubishi Electric Corporation

Eitetsu Igawa

Satoshi Ishitobi

Hiroyuki Ozaki

An optical transmitter includes: a semiconductor laser unit that outputs laser light of first output power and outputs a monitor current; a casing of an optical module that holds optical fiber; a monitor current detection unit that generates a monitor voltage; a laser driving unit that controls a laser driving current; a storage unit that stores information based on a result of a measurement of a ratio of second output power with respect to the first output power; a target voltage determination unit that changes the target voltage based on a detected temperature of a temperature sensor and the information based on the result of the measurement; and a power monitor value determination unit that generates a power monitor value indicating the second output power to be transmitted to a host device using the detected temperature and the information based on the result of the measurement.

Optical transmitter

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.

Growing community of inventors

Tokyo, Japan

Eitetsu Igawa