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Optical node device and system including the device

  • US 20020093707A1
  • Filed: 09/24/2001
  • Published: 07/18/2002
  • Est. Priority Date: 01/12/2001
  • Status: Active Grant
First Claim
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1. An optical node device applicable to an optical network including a closed loop provided by an optical fiber, comprising:

  • a tunable wavelength selecting element adapted to input WDM signal light obtained by wavelength division multiplexing a plurality of optical signals having different wavelengths, the tunable wavelength selecting element having a function of dropping at least one optical signal from the WDM signal light and a function of adding at least one optical signal to at least one unassigned wavelength channel of the WDM signal light; and

    a wavelength selecting filter optically connected to said tunable wavelength selecting element for removing noise present in any bands other than a signal band of each optical signal passing through said tunable wavelength selecting element.

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