Optical wavefront correction for variable groove depth grating w

Details Optical wavefront correction for variable groove depth grating w Optical wavefront correction for variable groove depth grating w

1997-02-21

1998-09-08

Ngo, John

Optical waveguides

With optical coupler

Input/output coupler

G02B 634

Patent

active

058057501

ABSTRACT:
A variable groove depth grating coupler located on a surface of an optical waveguide which couples a guided optical wave traveling in the optical waveguide to an outcoupled external wave has a resultant variable effective refractive index creating an aberration in the outcoupled optical wavefront. The wavefront aberration is corrected by providing the coupler grooves at a variable grating period which offsets effects of the variable effective refractive index on the wavefront aberrations.

REFERENCES:
patent: 5022730 (1991-06-01), Cimini et al.
patent: 5101459 (1992-03-01), Sunagawa
patent: 5276745 (1994-01-01), Revelli, Jr.
patent: 5315676 (1994-05-01), Sunagawa
patent: 5361244 (1994-11-01), Nakamura et al.
patent: 5471548 (1995-11-01), Brazas
A. Keith Bates, J. Kevin Erwin, Lifeng Li:, and James J. Burke "Output Beam Quality of Variable Groove Depth Grating Wave Guide Couplers", Optical Sciences Center, University of Arizona, Tucson, AZ 85721, Jul. 8, 1996.

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