Optical multiplexer-demultiplexer with mutually intersecting sub-gratings
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United States of America Patent
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Apr 22, 2003
Grant Date -
N/A
app pub date -
Nov 15, 2000
filing date -
Nov 16, 1999
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Expired
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Abstract
An optical multiplexer-demultiplexer has a diffraction grating formed from a plurality of mutually intersecting sub-gratings. Each sub-grating has a grating vector. The diffraction grating as a whole has a combined high-order grating vector equal to a sum of integer multiples of the grating vectors of the sub-gratings. The diffraction grating reflects incident optical signals by Bragg reflection. The difference between the propagation vector of an incident optical signal and the propagation vector of the reflected optical signal is equal to the combined high-order grating vector. A small change in wavelength of the incident optical signal can therefore produce a large change in propagation direction of the reflected optical signal.
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