×

Failure protection switching in optical network

  • US 20020181037A1
  • Filed: 06/01/2001
  • Published: 12/05/2002
  • Est. Priority Date: 06/01/2001
  • Status: Abandoned Application
First Claim
Patent Images

1. A method of effecting failure protection switching in an optical network, the optical network comprising a ring structure carrying a bi-directional optical data signal, and a plurality of network hubs arranged in-line within the ring structure, each network hub being arranged, in use, to transmit and receive signals bi-directionally along the ring structure, the method comprising the steps of:

  • a) detecting a “

    no signal”

    at a primary pre-amplifier located at one of the network hubs and arranged to pre-amplify a primary optical signal received from a first direction along the ring structure;

    b) shutting down the primary pre-amplifier and powering up a secondary pre-amplifier located at the one network hub and arranged to pre-amplify a redundant optical signal corresponding to the optical signal and received from the opposing direction along the ring structure.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×