Optical waveguides – Planar optical waveguide
Reexamination Certificate
2005-02-08
2005-02-08
Palmer, Phan T. H. (Department: 2874)
Optical waveguides
Planar optical waveguide
C385S014000, C385S015000, C385S016000
Reexamination Certificate
active
06853792
ABSTRACT:
A design for controlling optical modes in a closely spaced weakly confined waveguide array is described wherein the crosstalk between individual waveguides is suppressed by segmented deep etched trenches. One exemplary embodiment of the invention incorporates a shallow etched ridge waveguide array at the output coupler of a semiconductor optical demultiplexer. In this situation, all higher order modes and supermodes are filtered by a sequence of deep etched trenches located between the shallow etched ridge waveguides. The trenches have a minimal effect on the single fundamental mode of the individual shallow etched waveguides because the trenches are located far enough from the ridge waveguides where an evanescent tail of the fundamental mode approaches a minimal power level. The trenches affect and suppress all other modes including higher order leaky modes and array supermodes leaving the single fundamental mode propagating in the arrayed waveguides.
REFERENCES:
patent: 6177333 (2001-01-01), Rhodes
patent: 6403393 (2002-06-01), Adkisson et al.
patent: 6556759 (2003-04-01), Roberts et al.
Logvin Yury
O'Donnell Adrian
Freedman & Associates
Metrophotonics Inc.
Palmer Phan T. H.
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