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Passive optical network with diagnostic loop-back

  • US 5,907,417 A
  • Filed: 06/09/1997
  • Issued: 05/25/1999
  • Est. Priority Date: 12/30/1994
  • Status: Expired due to Term
First Claim
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1. An optical network unit for use in a passive optical network, the optical network unit comprising:

  • a) a receiver coupled to a downstream fiber for receiving downstream optical signals comprising diagnostic signals from a node which is coupled to the downstream fiber, said diagnostic signals being used to identify and locate network component failures;

    b) a transmitter coupled to an upstream fiber for transmitting upstream optical signals to the node which is connected to the upstream fiber; and

    c) means for optically coupling light from the downstream fiber to the upstream fiber.

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