Patent ID: 8660387
Filing Date: 2014-02-25
Classification: G02F

Abstract:
1. An athermal ring optical modulator, comprising: a first clad layer; a ring optical resonator having a rib optical waveguide, the rib optical waveguide having a convex portion formed on a semiconductor slab layer, the semiconductor slab layer being formed on the first clad layer; a second clad layer covering an upper side of the rib optical waveguide; an input-output optical waveguide coupling optically with the ring optical resonator; a first conduction type region formed in the semiconductor slab layer inside the ring optical resonator; and a second conduction type region formed in the semiconductor slab outside the ring optical resonator, wherein the second clad layer includes a material having a negative thermo-optical coefficient; and the semiconductor slab layer outside the convex portion is thinner than the semiconductor slab layer inside the convex portion.