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27 March 2022 A demodulation method for a Raman optical time domain reflectometer suitable for laid optical cables
Jun Yang, Chao Wang, Liqing Cheng, Shuxiang Song, Jian Huang, Biaoxing Li
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Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 1216950 (2022) https://doi.org/10.1117/12.2624279
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China
Abstract
We propose and experimentally prove a demodulation method for a Raman optical time domain reflectometer (ROTDR) that can eliminate the influence of the avalanche photodiode (APD) and multistage amplifier circuit amplification coefficient. This method only requires measurement of the real-time temperature of a reference fibre and can effectively eliminate the demodulation temperature drift caused by the temperature change of the APD and multistage amplifier circuit. The experimental results show that the demodulation temperature drift is reduced from approximately 20°C to 0.2°C. In addition, a demodulation method suitable for laid optical cables is proposed. The experimental results show that the standard deviation of the demodulation temperature at the test point of 5 km is 0.72°C. Finally, the equipment temperature in a communication room is stably monitored for 6 months by using the measuring point calibration method.
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Jun Yang, Chao Wang, Liqing Cheng, Shuxiang Song, Jian Huang, and Biaoxing Li "A demodulation method for a Raman optical time domain reflectometer suitable for laid optical cables", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 1216950 (27 March 2022); https://doi.org/10.1117/12.2624279
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KEYWORDS
Calibration
Demodulation
Optical fibers
Temperature metrology
Optical sensing
Raman spectroscopy
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