Double diffraction grating planar lightwave circuit
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United States of America Patent
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Jun 27, 2006
Grant Date -
Sep 29, 2005
app pub date -
Aug 24, 2004
filing date -
Mar 24, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a planar lightwave circuit including a pair of opposed concave reflective diffraction gratings sharing the same focal line, which separates first and second slab waveguide regions. The ends of input and output waveguides are positioned along the focal line for launching and receiving light directed by one or both of the diffraction gratings. The invention enables light within in a certain wavelength range to be launched from an input waveguide, directed by a single diffraction grating, and output waveguides, all within a single slab waveguide region, while light within another wavelength range will be directed from one diffraction grating to another for output waveguides in a different slab waveguide region.
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