×

Fault location in optical communication systems

  • US 6,075,628 A
  • Filed: 08/22/1997
  • Issued: 06/13/2000
  • Est. Priority Date: 08/17/1994
  • Status: Expired due to Term
First Claim
Patent Images

1. An optical transmission system including a data transmitter arranged to transmit a downstream scrambled data sequence, a data receiver, an optical fibre path for carrying transmitted optical signals therebetween, wherein said system incorporates means for retrieving from the transmission path signals including a reflection of the transmitted data sequence from a fault, and signal processing means for correlating said reflection of the transmitted data sequence with a time delayed copy of that data sequence so as to determine from the duration of said time delay a location in the optical fibre path of the fault from which the data sequence has been reflected, whereby the transmitted data sequence provides a test signal for fault detection while the transmission system is in service.

View all claims
  • 12 Assignments
Timeline View
Assignment View
    ×
    ×