H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/08 (2006.01) G01M 11/00 (2006.01)
Patent
CA 2178952
Monitoring optical broadband service cables up to passive interface A pseudo-noise binary signal is transmitted together with the information signal from an OWG line unit, and a small component of the optical signal is branched off at the passive interface and transmitted back to the line unit and fed there to the optoelectric transducer together with the optical signal received from the opposite end; the received electric signal is sub- jected to a correlation with the original pseudo-noise binary signal which has in the meantime been delayed in time, after which the correlation signal amplitude obtained in the process indicates correctly in terms of signal propagation time the occurrence or nonoccurrence of the pseudo-noise binary signal reflected by the passive interface (PNT1).
Un signal binaire de bruit pseudo-aléatoire est transmis avec le signal d'information depuis une unité de raccordement à grande longueur d'onde. Une partie réduite du signal optique est déviée sur un embranchement au niveau de l'interface passive et retransmise à l'unité de raccordement, puis transmise, avec le signal optique reçu en sens inverse, au transducteur optoélectrique. Le signal électrique de réception est soumis à une corrélation avec le signal binaire originel de bruit pseudo-aléatoire entre-temps retardé. L'amplitude des signaux de corrélation ainsi obtenue indique, en tenant compte du temps de propagation du signal, l'occurrence ou la non-occurrence du signal binaire de bruit pseudo-aléatoire réfléchi par l'interface passive (PNT1)
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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