Optical coupler having self-focusing region and arryed-waveguide grating structure including the same

摘要

Provided are an optical coupler and an arrayed-waveguide grating structure including the same. The coupler includes a lower clad layer, a core comprising a slab waveguide region disposed on one side of the lower clad layer and a ridge waveguide region disposed on the other side of the lower clad layer, and an upper clad disposed on the core, wherein the ridge waveguide region comprises a self-focusing region configured to focus an optical signal provided form the slab waveguide region and thus to prevent scattering of the optical signal.

主权项

1. A coupler comprising:
a lower clad layer disposed in a slab wave guide region, a tapering region, a straight region, and a self-focusing region that are arranged in the order of the slab waveguide region, the tapering region, the straight region, and the self-focusing region; a core disposed on the lower clad layer and comprising a slab and a plurality of ribs; and an upper clad disposed on the core, wherein the slab includes:
a first portion disposed in the slab waveguide region; anda second portion disposed adjacent to the first portion and in the tapering region and the straight region, wherein the ribs include:
lower ribs defined by trenches formed in the self-focusing region; andupper ribs disposed on the lower ribs, respectively, and wherein the trenches in the self-focusing region are configured to focus an optical signal provided from the slab waveguide region to reduce scattering of the optical signal.