Patent ID: 6526186
Filing Date: 2003-02-25
Classification: G02F

Abstract:
An optical modulator, comprising:a substrate having an electrooptic effect; an optical waveguide having first and second cascading portions in the substrate, and transmitting an optical field; a first coplanar waveguide electrode having first, second and third parts, wherein the first part is approximately perpendicular to the second and third parts and does not overlap the first and second cascading portions; a second coplanar waveguide electrode having a first part over the first cascading portion and second and third parts extending beyond the first cascading portion, wherein the first part is approximately perpendicular to the second and third parts; a third coplanar waveguide electrode having a shape symmetric to the first coplanar waveguide electrode and separated apart from the second coplanar waveguide electrode by a distance the same as the distance between the first and second coplanar waveguide electrodes; and a voltage source supplying a voltage to the second coplanar waveguide electrode, wherein the first and third coplanar waveguide electrodes are grounded, so that electrooptic overlap integrals of each cascading portion of the optical waveguide are different, thereby generating a fixed non-zero amount of a modulation chirp parameter.