LIGHT INTENSITY MODULATOR AND OPTICAL FREQUENCY SHIFTER

摘要

PROBLEM TO BE SOLVED: To provide a light intensity modulator and an optical frequency shifter of which the restriction of frequency shift is eliminated and the drift of a modulation operating point is suppressed.

SOLUTION: The light intensity modulator modulates the light intensity of an optical signal made incident as a carrier wave (a) from a light source 1 on the basis of the modulating signal b of the predetermined frequency inputted from a modulation control section MC, and outputs the light intensity- modulated wave c. The modulation control section MC is provided with a beat detecting part BS which detects the beat components of the carrier wave and the light intensity-modulated wave, and a bias control section BC which adjusts bias voltage to output a modulated wave so that the beat components is minimized.

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