Fiber optic telecommunications card with energy level monitoring

  • US 10,205,516 B2
  • Filed: 08/18/2017
  • Issued: 02/12/2019
  • Est. Priority Date: 07/09/2001
  • Status: Active Grant
First Claim
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1. A telecommunications apparatus, comprising:

  • an optical receiver affixed to a printed circuit board and configured to receive an optical data signal from an optical fiber of an optical fiber telecommunications system;

    an energy level detector circuit, optically coupled to the optical fiber upstream from the optical receiver, wherein the energy level detector circuit is configured to monitor an energy level of the optical data signal and generate an alarm based on the energy level and one or more energy level thresholds, wherein the energy level detector circuit includes;

    a photodetector to generate a photodetector voltage indicative of an energy level of the optical data signal; and

    one or more comparators corresponding to the one or more energy level thresholds, wherein each of the one or more comparators;

    includes a first input coupled to an output voltage indicative of the photodetector voltage;

    includes a second input coupled to a corresponding reference voltage; and

    generates a comparator signal indicative of a comparison between the corresponding reference voltage and the output voltage.

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