Sumitomo Electric Device Innovations, Inc.

Tomoki Ito

Takeshi Irie

Ryutaro Takei

Masatsugu Togasaki

Kazuhisa Ozaki

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.

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Yokohama, Japan

Tomoki Ito