Optical modulation apparatus and optical modulation method

Abstract

An optical modulation apparatus is provided with an optical modulator 2, a variable gain amplifying circuit 1 connected to this optical modulator 2, a detecting circuit 3 and a gain control circuit 4. A modulated input signal is entered into the variable gain amplifying circuit 1, and the variable gain amplifying circuit 1 amplifies this signal and delivers it to the optical modulator 2 as modulation drive signal. The detecting circuit 3 controls the variable gain amplifying circuit 1 on the basis of the detected signal. This optical modulation apparatus manifests steady optical modulation characteristics even if the amplitude of modulated input signals or ambient temperature varies.

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