Optical multiplexer/demultiplexer
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United States of America Patent
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Oct 12, 2004
Grant Date -
N/A
app pub date -
Dec 11, 2001
filing date -
Mar 13, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A monolithic version of optical multiplexer/demultiplexer with an improved spectral characteristics is provided by two diffraction gratings arranged optically in tandem and with a field stop in the coupling between them, the gratings also being arranged to provide free spectral ranges differing by a factor of at least two, and having a coupling between them that carries over into the second grating information concerning the dispersion afforded by the first grating. The field stop is constituted by a pair of etched troughs arranged in the pattern of an open chevron.
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