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Device and method for testing of multi-branch optical network

  • US 6,512,610 B1
  • Filed: 03/03/1999
  • Issued: 01/28/2003
  • Est. Priority Date: 03/11/1998
  • Status: Expired due to Fees
First Claim
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1. A multi-branch optical network testing method comprising the steps of:

  • inputting optical pulses to a branch point at which a multi-branch optical network branches off by a plurality of optical lines;

    receiving response beams corresponding to mixture of reflection beams which are produced by reflecting the optical beams at selected portions of the optical lines respectively;

    performing logarithmic conversion on waveform data corresponding to electric signals, which are produced by converting the response beams;

    performing calculations on the logarithmically-converted waveform data to produce an approximation line;

    comparing the logarithmically-converted waveform data with the approximation line to detect Fresnel reflection points on the waveform data;

    using the Fresnel reflection points as split points to split the waveform data to a number of ranges;

    performing separative analysis on each of the ranges to calculate attenuation constants with respect to each of the optical lines;

    storing the attenuation constants in a storage device in connection with each of measurement times; and

    determining a fault occurrence time, a fault occurrence line and a fault occurrence distance with respect to a fault that occurs in the multi-branch optical network having the optical lines on the basis of the attenuation constants which are repeatedly calculated every prescribed time and stored in the storage device.

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