Sung Yoo

US Patent:

57969027, Aug 18, 1998

Filed:

Jul 5, 1996

Appl. No.:

8/682863

Inventors:

Rajaram Bhat - Middletown NJ
Catherine Caneau - Red Bank NJ
Mark A. Koza - Colonia NJ
Sung Joo Yoo - Long Branch NJ

Assignee:

Bell Communications Research, Inc. - Morristown NJ

International Classification:

G02B 600

US Classification:

385122

Abstract:

A waveguide having alternating regions of different crystallographic orientations, thereby providing quasi-phase-matching for a non-linear frequency conversion, in which two wafers with or without epitaxial layers thereon are bonded together having different, preferably opposed, crystallographic orientations. One wafer is etched away, and a grating is etched such that one part of the grating has the orientation of one wafer and the other part has the orientation of the other wafer. Thereafter, a waveguide structure is epitaxially deposited upon the differentially oriented template so that the waveguide is differentially oriented in its axial direction. Thereby, quasi-phase-matching non-linear effects can be achieved. Several important devices can thereby be achieved, including a coherent optical source using frequency doubling and a frequency converter useful in wavelength division multiplexed communication, as well as others.