Patent ID: 9235066
Filing Date: 2016-01-12
CPC Classification: G02F,H04B

Claim Text:
1. An optical modulator comprising: a substrate composed of a material having an electro-optic effect; an optical waveguide formed in the substrate; and a modulation electrode for modulating lightwaves propagating through the optical waveguide, wherein output light that is output from the optical waveguide is guided with an optical fiber transmission line, in which the modulated lightwaves are transmitted, wavelength dispersion characteristics of the optical fiber transmission line are compensated for by performing polarization reversal of the substrate along the optical waveguide with a predetermined pattern so as to give waveform distortion with characteristics that are inverse to the wavelength dispersion characteristics of the optical fiber transmission line to the lightwaves propagating through the optical waveguide, and the compensation for the wavelength dispersion characteristics of the optical fiber transmission e is adjusted to a predetermined level by disposing an adjustment member made of a dielectric material or a metal material in the vicinity of the modulation electrode.