Patent ID: 7643708

Claim:
An optical modulator for generating an optical pulse signal, comprising: a substrate having an electro-optic effect; and an optical waveguide formed in said substrate to have an incident light passed therethrough, said optical waveguide partly forming a traveling wave electrode including a first center electrode and first ground electrodes to have a high frequency electric signal applied thereto, said traveling wave electrode and said optical waveguide collectively forming a high frequency interaction portion to have said incident light phase modulated under the condition that said high frequency electric signal is applied to said traveling wave electrode, and bias electrodes each including a second center electrode and second ground electrodes to have a bias voltage applied thereto, each of said bias electrodes and said optical waveguide collectively forming a bias voltage interaction portion to have said incident light phase modulated under the condition that said bias voltage is applied to said bias electrode, in which said traveling wave electrode and said bias electrodes are extended in a propagation direction of said incident light with said traveling wave electrode positioned between said bias electrodes, the second center electrodes of said bias electrodes are electrically connected with each other on said substrate, ensuring that the bias voltage is applied to said second center electrodes from one bias electric source.