DWDM optical source wavelength control
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United States of America Patent
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app pub date -
Sep 26, 2002
filing date -
Mar 28, 2000
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Abstract
Using the beat signal obtained by detecting two optical channel groups simultaneously, the present invention provides a more precise control of the channel spacing of dense-wavelength-division-multiplexed (DWDM) systems than conventional methods using optical filters. Each channel group consists of at least one optical channel. The polarization dependence of the beat signal is suppressed using a polarization controller or a polarization scrambler. With this invention, the DWDM channel spacing can be made a few 10 GHz or less. This invention further provides a bi-directional optical communication system that can minimize the channel crosstalks caused by various optical reflections slightly shifting counter propagating optical channel frequencies.
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