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Cutoff-mesa isolated rib optical waveguide for III-V heterostructure photonic integrated circuits

United States Patent

5,745,630
April 28, 1998
View the Complete Patent at the US Patent & Trademark Office
Sandia National Laboratories - Visit the Intellectual Property Management and Licensing Website
A cutoff mesa rib waveguide provides single-mode performance regardless of any deep etches that might be used for electrical isolation between integrated electrooptic devices. Utilizing a principle of a cutoff slab waveguide with an asymmetrical refractive index profile, single mode operation is achievable with a wide range of rib widths and does not require demanding etch depth tolerances. This new waveguide design eliminates reflection effects, or self-interference, commonly seen when conventional rib waveguides are combined with deep isolation etches and thereby reduces high order mode propagation and crosstalk compared to the conventional rib waveguides.
Vawter; Gregory A. (Albuquerque, NM), Smith; Robert E. (Albuquerque, NM)
Sandia Corporation (Albuquerque, NM)
08/ 603,841
February 22, 1996
This invention was made with Government support under Contract DE-AC04-94AL85000 awarded by the U.S. Department of Energy. The Government has certain rights in the invention.