1989-05-17
1990-04-24
Sikes, William L.
350 9631, G02B 610
Patent
active
049195042
ABSTRACT:
A planar waveguide comprises a semiconductor substrate having one or more grooves along the surface of the substrate. A plurality of sequences of superlattice layers separated by a spacer layer over the grooved substrate is provided. The number of superlattice periods in each sequence changes from the base of the groove to the surface of the waveguide so as to provide a graded index of refraction in at least a portion of the region above the groove.
Colas Etienne G.
Yi-Yan Alfredo
Bell Communications Research Inc.
Falk James W.
Guenzer Charles S.
Sikes William L.
Wise Robert E.
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