Patent ID: 9568677
Date: 2017-02-14
CPC Classifications: G02B

Claim:
1. A waveguide structure, comprising: a substrate, wherein the substrate has an interconnection region and a waveguide region; a trench formed in the substrate, wherein the trench has a sloping sidewall surface and a substantially flat bottom, wherein the substrate has a flat top surface adjoining the sloping sidewall surface of the trench; a bottom cladding layer formed on the substrate, wherein the bottom cladding layer extends from the interconnection region to the waveguide region, and the bottom cladding layer acts as an insulating layer in the interconnection region; and a metal layer comprising a first portion and a second portion, wherein the first portion is formed over the flat top surface of the substrate in the interconnection region, the second portion is formed on the bottom cladding layer on the sloping sidewall surface of the trench in the waveguide region, wherein the metal layer is spaced apart from the substrate by the bottom cladding layer, and the first portion is spaced apart from the second portion.