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High dynamic range OTDR data acquisition circuit

  • US 5,485,264 A
  • Filed: 12/14/1993
  • Issued: 01/16/1996
  • Est. Priority Date: 12/14/1993
  • Status: Expired due to Fees
First Claim
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1. An OTDR to conduct a test on optic fibre by passing a light pulse along the fibre and monitoring the signal reflects;

  • said OTDR comprising a switchable light source to generate an optical pulse upon application of an enabling signal thereto, a receiver to receive a signal reflected from said fibre, an analog to digital converter to sample periodically said received signal during an interrogation period associated with each of said light pulses and provide during each interrogation period a plurality of digitized samples of the received signal with each of said samples corresponding to a particular location along said fibre, a memory to store said samples to provide an indication of the variation of said reflected signal as said light pulse passes along said fibre, said memory having a plurality of storage locations to receive and store individual ones of said digitized samples and having a control associated therewith to generate successive control signal each control signal being operable (to store said samples) upon said memory to access a next one of said locations in a predetermined sequence within said memory and a reset signal generator to apply said enabling signal to said light source and to reset said control to access an initial one of said storage locations in said predetermined sequence and thereby permit repetitive storage of samples in said predetermined sequence in said memory.

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