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Apparatus and method for monitoring an optical transmission line

  • US 20030081280A1
  • Filed: 10/28/2002
  • Published: 05/01/2003
  • Est. Priority Date: 10/31/2001
  • Status: Active Grant
First Claim
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1. An apparatus for monitoring an optical transmission line, the apparatus comprising:

  • a signal transmitter for transmitting an optical pilot signal of a predetermined duration along said optical transmission line;

    a signal returner for returning back along said optical transmission line a return signal corresponding to at least part of said optical pilot signal, the signal returner being at a predetermined point along the optical transmission line;

    optical detection apparatus for detecting said optical pilot signal and for detecting said return signal;

    a monitoring unit for receiving detection signals from said optical detection apparatus, for determining the time relationship between the predetermined duration of the optical pilot signal and the round-trip transit time of the optical pilot signal from said optical detection apparatus to said signal returner and back to said optical detection apparatus, for generating a first monitoring signal when the determined time relationship has a predetermined value, and for generating at least one further monitoring signal in other cases.

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