Patent ID: 9720300
Date: 2017-08-01
CPC Classifications: G02F,H04B

Claim:
1. An apparatus for controlling operation of an electro-optic modulator, comprising: a first optical tap configured to tap input light that is input to the electro-optic modulator; a second optical tap configured to tap output light that is output from the electro-optic modulator, wherein the electro-optic modulator includes two coupled optical waveguides for producing the output light from the input light; and a circuit configured to generate a control signal for heating one of the two coupled optical waveguides to control a bias point of operation on a modulator transfer function of the electro-optic modulator that relates an intensity of light at the output of the electro-optic modulator to a wavelength, wherein the control signal is based on a difference between an intensity of the input light and an intensity of the output light.