200 km fiber-loop Brillouin distributed fiber sensor using bipolar Golay codes and a three-tone probe

Aiming at taking full advantage of bipolar codes, a method using a three-tone probe is proposed to alleviate the probe power limitation imposed by pump depletion in Golay-coded Brillouin distributed fiber sensors. Experimental results validate the technique, which reduces significantly the measurement distortions induced by the gain/loss unbalance resulting from pump depletion/amplification. The method supports a probe power increment of more than 12.5 dB, resulting in low-uncertainty measurements (< 0.9 MHz) at a real 100 km distance, using a 200 km-long fiber loop and 2 m spatial resolution. The method is evaluated with a record figure-of-merit of 380’000.


Published in:
Proc. SPIE, 9634, 96340J
Presented at:
24th International Conference on Optical Fibre Sensors, Cutitiba, Brazil, September 28-October 2, 2015
Year:
2015
Publisher:
Bellingham, SPIE
ISBN:
978-1-62841-839-2
Keywords:
Laboratories:




 Record created 2015-10-22, last modified 2018-03-17

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