Patent ID: 7035508
Filing Date: 2006-04-25
Classification: G02B,H01S

Abstract:
1. A waveguide disposed on a substrate comprising: an input port for receiving an optical signal having a first optical mode; a first waveguide portion having a first optical length coupled to the input port for propagating the optical signal with the first optical mode; a second waveguide portion coupled to the first waveguide portion for receiving the optical signal having the first optical mode and for transforming the optical mode of the optical signal from the first optical mode to a second optical mode along a length of the second waveguide portion; and, at least a corner reflector optically coupled to the second waveguide portion for receiving the optical signal having the second optical mode from the second waveguide portion and for internally reflecting the second optical mode back into the second waveguide portion, where the optical signal having the second optical mode upon reflection from the corner reflector propagates along the second waveguide portion and therefrom to the first waveguide portion.