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Optical signal monitoring method and apparatus

  • US 6,538,779 B1
  • Filed: 06/14/1999
  • Issued: 03/25/2003
  • Est. Priority Date: 06/15/1998
  • Status: Expired due to Term
First Claim
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1. A method for monitoring a quality of a light signal having a data transmission rate in an optical network, comprising the steps:

  • a) extracting a clock signal from the light signal;

    b) setting a decision region for each bit of the light signal, wherein the decision region is defined by a plurality of threshold amplitudes corresponding respectively to threshold phases which are produced with respect to the clock signal; and

    c) monitoring the quality of the light signal depending on whether an amplitude of the light signal falls into the decision region.

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