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Method and system for communication between optical and SONET layers in mixed WDM/SONET networks

  • US 6,122,082 A
  • Filed: 01/20/1998
  • Issued: 09/19/2000
  • Est. Priority Date: 01/20/1998
  • Status: Expired due to Fees
First Claim
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1. A system for communicating between optical and SONET layers in a mixed WDM/SONET network, where said optical layer comprises WDM equipment and a service restoration system using optical switches for optically protecting individual SONET channels and for protecting said network from loss of WDM traffic by rerouting WDM traffic through a dedicated protection ring, said dedicated protection ring comprising at least three nodes with WDM and SONET equipment, said communication system comprising:

  • a plurality of optoelectronic units for monitoring WDM and SONET traffic and control of said optical switches of said service restoration system, said optoelectronic units being deployed at each node of said dedicated protection ring;

    at least one optoelectronic unit of said plurality comprising at least one local control loop for each direction of said WDM traffic, said local control loop comprising;

    a WDM/SONET adapter for communicating information between said WDM and SONET equipment by generating temporary SONET signals and passing these signals through said WDM and SONET equipment;

    at least a pair of coupling devices for coupling said WDM/SONET adapter with said node of said dedicated protection ring; and

    each said optoelectronic unit comprises an optical switching circuit for manipulating said optical switches, each said optical switching circuit being connected to said WDM/SONET adapter for receiving said temporary SONET signals.

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