| 摘要 |
An optical output stabilizing circuit is disclosed, which comprises a pilot signal generator, a pilot signal amplitude adjusting circuit which adjusts an amplitude of a pilot signal, a laser driving circuit which modulates a driving pulse current of a semiconductor laser by an output signal of the adjusting circuit, and drives the laser by the modulated driving current, a pilot signal detecting circuit which detects a detection voltage corresponding to the amplitude of the pilot signal, a first error amplifier which generates a difference signal by comparing the first detection voltage with a first reference voltage, and which, on the basis of the difference signal, controls the adjusting circuit, and a reference voltage temperature compensating circuit which carries out temperature compensation of the reference voltage of the first error amplifier to decrease fluctuation of an extinction ratio of the output beam of the laser at the high temperature operation time.
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