System and method for narrow channel spaced dense wavelength division multiplexing/demultiplexing
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United States of America Patent
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Sep 2, 2003
Grant Date -
Aug 15, 2002
app pub date -
Feb 12, 2001
filing date -
Feb 12, 2001
priority date (Note) -
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Abstract
A method and apparatus for executing narrow channel spaced dense wavelength division multiplexing ('DWDM') includes an optical multiplexor/demultiplexor with channel add/drop having a first circulator and a second circulator. A first fiber Bragg grating couples with the first circulator and the second circulator. A second fiber Bragg grating couples with the second circulator. The fiber Bragg gratings separate optical signals in an interleaved manner. The optical multiplexor/demultiplexor with channel add/drop further includes at least one optical filter in communication with the first circulator. The system can further include at least one optical filter in communication with the second circulator as well. The optical filters are spaced apart a greater distance with respect to channel spacing than the channels passing through the system. However, the unique combination of the circulators and fiber Bragg gratings allow the filters to function at the wider spacing to add/drop channel signals.
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