An optical modulator is provided. The optical modulator includes a thin plate made of an electrooptic material and having a thickness of 20 .mu.m or less, an optical waveguide formed on a top or bottom surface of the thin plate, and a modulation electrode formed on the top surface of the thin plate to modulate light passing through the optical waveguide, wherein, in a shape of the thin plate, a width of the thin plate at an optical input portion or optical output portion of the optical waveguide is two time or less the thickness of the thin plate.

 
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