18889447. OPTICAL TRANSMISSION LINE MONITORING DEVICE AND OPTICAL TRANSMISSION LINE MONITORING METHOD (Fujitsu Limited)
OPTICAL TRANSMISSION LINE MONITORING DEVICE AND OPTICAL TRANSMISSION LINE MONITORING METHOD
Organization Name
Inventor(s)
Junichi Sugiyama of Kawasaki JP
OPTICAL TRANSMISSION LINE MONITORING DEVICE AND OPTICAL TRANSMISSION LINE MONITORING METHOD
This abstract first appeared for US patent application 18889447 titled 'OPTICAL TRANSMISSION LINE MONITORING DEVICE AND OPTICAL TRANSMISSION LINE MONITORING METHOD
Original Abstract Submitted
Polarization fluctuation occurs in optical transmission line between first terminal node and second terminal node is monitored. Delay measurement for each of a plurality of spans constituting the optical transmission line is performed. Processor in optical transmission line monitoring device calculates, for each of the plurality of spans, refractive index of optical fiber laid in the span based on span length and the delay measurement value. The processor calculates propagation time of light between the first terminal node and a polarization fluctuation position based on timing information indicating timing at which polarization fluctuation generated on the optical transmission line is detected in each of the first and second terminal nodes. The processor calculates a distance between the first terminal node and the polarization fluctuation position based on the propagation time and the refractive index calculated for each of the plurality of spans.