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Reconfigurable optical add/drop multiplexer network element for C-band and L-band optical signals

  • US 9,130,692 B2
  • Filed: 04/23/2012
  • Issued: 09/08/2015
  • Est. Priority Date: 04/23/2012
  • Status: Active Grant
First Claim
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1. A system for routing C-band and L-band optical signals, comprising:

  • (a) a C-band subsystem comprising one or more reconfigurable optical add/drop multiplexer (ROADM) modules arranged to select one or more C-band optical signals from a plurality of optical wavelength division multiplexed (WDM) signals received by the C-band subsystem, the C-band subsystem further comprising;

    (i) a plurality of optical switches arranged to select the one or more C-band optical signals from the plurality of optical WDM signals received by the C-band subsystem; and

    (ii) at least one multiplexer arranged to multiplex the one or more C-band optical signals selected by the plurality of optical switches;

    (b) an L-band subsystem comprising one or more ROADM modules arranged to select one or more L-band optical signals from a plurality of optical WDM signals received by the L-band subsystem, the L-band subsystem further comprising;

    (i) a plurality of optical switches arranged to select the one or more L-band optical signals from the plurality of optical WDM signals received by the L-band subsystem; and

    (ii) at least one multiplexer arranged to multiplex the one or more L-band optical signals selected by the plurality of optical switches;

    (c) at least two amplifiers arranged to amplify signals outputted by at least one of the multiplexers;

    (d) a dispersion compensating unit interposed between an output of one of the at least two amplifiers and an input of another of the at least two amplifiers;

    (e) at least one communication path for forwarding signals selected by the C-band and L-band subsystems; and

    (f) a combiner arranged to combine the one or more C-band optical signals and the one or more L-band optical signals selected by the C-band and L-band subsystems.

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