Two-stage optical bi-directional transceiver
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United States of America Patent
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Apr 24, 2007
Grant Date -
Sep 29, 2005
app pub date -
Jun 1, 2005
filing date -
Mar 24, 2004
priority date (Note) -
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Abstract
The invention relates to a planar lightwave circuit including a two stage optical filter for use in a bi-directional transceiver. A first stage includes a non-dispersive optical filter, which enables light within in a certain wavelength range, e.g. a signal channel from a laser source, to be launched onto an input/output waveguide, while light within another wavelength range, e.g. one or more detector channels, will be directed from the input/output waveguide to a second stage. The second stage includes a reflective diffraction grating with a higher resolution than the first stage providing passbands 2 to 5 times thinner than the first stage.
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