Patent ID: 9122085
Filing Date: 2015-09-01
Classification: G02F

Abstract:
1. An apparatus, comprising: a conductive or semiconductive substrate; a dielectric layer located directly on said substrate; a semiconductor layer located directly on the dielectric layer, said semiconductor layer including a ridge waveguide and a heater strip extending parallel to said ridge waveguide, wherein said heater strip is electrically isolated from said ridge waveguide and is doped to carry a current therein about parallel to said ridge waveguide; a first electrode pad and a second electrode pad located on different parts of the heater strip wherein the current is carried between the first electrode pad and the second electrode pad in a direction about parallel to said ridge waveguide; and a third electrode pad located on the heater strip in between the first electrode pad and the second electrode pad, wherein a portion of the current is configured to be carried in a first direction through the heater strip from the first electrode pad to the third electrode pad and a different portion of the current is configured to be carried in a second direction, that is opposite the first direction, through the heater strip from the second electrode pad to the third electrode pad.