A new OTDR based on probe frequency multiplexing

Lidong Lu; Yun Liang; Binglin Li; Jinghong Guo; Xuping Zhang

doi:10.1117/12.2037468

20 December 2013 A new OTDR based on probe frequency multiplexing

Lidong Lu, Yun Liang, Binglin Li, Jinghong Guo, Xuping Zhang

Proceedings Volume 9044, 2013 International Conference on Optical Instruments and Technology: Optical Sensors and Applications; 904415 (2013) https://doi.org/10.1117/12.2037468
Event: International Conference on Optical Instruments and Technology (OIT2013), 2013, Beijing, China

Abstract

Two signal multiplexing methods are proposed and experimentally demonstrated in optical time domain reflectometry (OTDR) for fault location of optical fiber transmission line to obtain high measurement efficiency. Probe signal multiplexing is individually obtained by phase modulation for generation of multi-frequency and time sequential frequency probe pulses. The backscattered Rayleigh light of the multiplexing probe signals is transferred to corresponding heterodyne intermediate frequency (IF) through heterodyning with the single frequency local oscillator (LO). Then the IFs are simultaneously acquired by use of a data acquisition card (DAQ) with sampling rate of 100Msps, and the obtained data are processed by digital band pass filtering (BPF), digital down conversion (DDC) and digital low pass filtering (BPF) procedure. For each probe frequency of the detected signals, the extraction of the time domain reflecting signal power is performed by parallel computing method. For a comprehensive performance comparison with conventional coherent OTDR on the probe frequency multiplexing methods, the potential for enhancement of dynamic range, spatial resolution and measurement time are analyzed and discussed. Experimental results show that by use of the probe frequency multiplexing method, the measurement efficiency of coherent OTDR can be enhanced by nearly 40 times.

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Lidong Lu, Yun Liang, Binglin Li, Jinghong Guo, and Xuping Zhang " A new OTDR based on probe frequency multiplexing ", Proc. SPIE 9044, 2013 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 904415 (20 December 2013); https://doi.org/10.1117/12.2037468

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KEYWORDS

Multiplexing

Phase modulation

Signal detection

Modulation

Heterodyning

Time division multiplexing

Digital filtering

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