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Integrated signal loss detection in Raman amplified fiber spans or other fiber spans

  • US 10,707,638 B2
  • Filed: 11/13/2017
  • Issued: 07/07/2020
  • Est. Priority Date: 11/13/2017
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • multiple ports configured to be coupled to multiple optical fibers and to transmit first optical signals and receive second optical signals over the optical fibers;

    a signal source configured to generate a first additional optical signal for inclusion with the first optical signals;

    a signal detector configured to detect a second additional optical signal included with the second optical signals;

    at least one pump configured to generate Raman pump power;

    at least one multiplexer configured to inject the Raman pump power onto at least one of the optical fibers; and

    a switch configured to selectively couple the signal source to one of the ports, the switch configured to couple the signal source to different ones of the ports in different configurations of the switch, the different configurations of the switch based on whether the Raman pump power is used for forward or backward Raman amplification.

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