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Two-fiber optical shared protection ring with a bi-directional 4×4 optical switch fabric

  • US 6,771,852 B2
  • Filed: 04/05/2002
  • Issued: 08/03/2004
  • Est. Priority Date: 04/06/2001
  • Status: Expired due to Fees
First Claim
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1. A protection switch for use in a node of a two-fiber optical shared protection ring, the two-fiber optical shared protection ring propagating at least one bi-directional channel, each bi-directional channel including a working first wavelength signal and a working second wavelength signal, one fiber in the two-fiber optical channel shared protection ring propagating the working first wavelength signal in a first direction and the other fiber in the two-fiber optical channel shared protection ring propagating the working second wavelength signal in a second direction opposite the first direction, the switch comprising:

  • an N×

    N optical switch fabric system disposed in the node, the N×

    N optical switch fabric including 2N input/output (I/O) ports, each optical switch fabric being configured to switch at least one bi-directional channel, wherein N is four, or an integer multiple of four;

    at least N three-port optical devices coupled to N I/O ports, each three-port optical device includes a bi-directional port coupled to one I/O port, the bi-directional port being configured to propagate the at least one bi-directional channel.

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