Patent ID: 8036540

Claim:
An optical transmitter with a function to enable or to disable an optical output synchronizing with an external command, comprising: a laser diode configured to generate said optical output responding to said external command by providing a driving current to said laser diode; a feedback loop to control a temperature of said laser diode automatically, said feedback loop including a thermo-electric cooler configured to mount said laser diode thereon, a temperature sensor configured to sense a temperature of said laser diode, and a processing unit configured to compare said temperature of said laser diode sensed by said temperature sensor with a reference and to drive said thermo-electric cooler based on said comparison; and a unit configured to suppress a temperature deviation of said laser diode, when said optical transmitter is enabled by said external command, by superposing a pulsed signal momentarily on said feedback loop, wherein said unit includes an attenuator and a differentiator, said attenuator attenuating said external command, said differentiator forming said pulse signal based on said attenuated external command.