Browse Prior Art Database

COMPOSITIONAL COUPLING OF LASERS INTO LOW LOSS WAVEGUIDES

IP.com Disclosure Number: IPCOM000024001D
Original Publication Date: 1979-Jun-30
Included in the Prior Art Database: 2004-Apr-01
Document File: 2 page(s) / 308K

Publishing Venue

Xerox Disclosure Journal

Abstract

Compositional, tapered coupling has been used to connect components, such as a diode laser and a waveguide, in an integrated optical circuit. Light from the laser having a lower bandgap guide is coupled into a higher bandgap waveguide. The transition from one group of compositional layers to another has been obtained by LPE growth of a first group of such layers, selective etching or ion milling to form a step.4ike mesa followed by LPE growth of a second group of layers. This requires a two.-stepLPE growth technique.

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XEROX DISCLOSURE JOURNAL

COMPOSITIONAL COUPLING OF Proposed Classification LASERS INTO LOW LOSS WAVEGUIDES U.S. CL 331/94.5 F-I ~bert D. Burnham~~ Int. Cl. HOls 3/00

Donald R. Scifres William Streifer

20

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Compositional, tapered coupling has been used to connect components, such as a diode laser and a waveguide, in an integrated optical circuit. Light from the laser

having a lower bandgap guide is coupled into a higher bandgap waveguide. The transition from one group of compositional layers to another has been obtained by LPE growth of a first group of such layers, selective etching or ion milling to form a step.4ike mesa followed by LPE growth of a second group of layers. This requires a two.~stepLPE growth technique.

Tapering of the layer thickness at the region of coupling on a convex surface of the substrate can be achieved in one-step growth technique. A step-like mesa is formed in the substrate 10 by etching or ion milling prior to growth. Since the

convex surfaces do not favor nucleation, tapering and discontinuous growth can be obtained in the region above mesa 12 significantly changing the effective index of refraction in the layers in this region and allow for coupling from a higher index of refraction guide 16 to a lower index of refraction guide 22. Additional coupling would be obtained because of the loss of waveguiding due to the change of

curvature of the waveguide ne...