Importance

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Abstract

An optical modulator for modulating light emitted from a signal light source has a substrate having electrooptic effect, an optical waveguide of a Mach-Zehnder type formed on the substrate, an electrode formed on the substrate to control light propagated in the optical waveguide, a light guiding unit for guiding light radiated or leaking from the optical waveguide, an interference light generating means for making light emitted from the light guiding unit and signal light leaking from the optical waveguide interfere with each other to generate interference light, and for emitting the interference light from an end surface of the substrate, a photo-detector for monitoring the interference light obtained by the interference light generating means, and a signal controlling circuit for controlling an operating point of the optical modulator according to a change of the interference light monitored by the photo-detector, thereby stably controlling the operating point of the optical modulator while facilitating a design of the mechanism.

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First Claim