Brillouin optical time-domain analysis over a 240 km-long fiber loop with no repeater

In this paper we combine the use of optical pulse coding and seeded second-order Raman amplification to extend the sensing distance of Brillouin optical time-domain analysis (BOTDA) sensors. Using 255-bit Simplex coding, the power levels of the Raman pumps and the Brillouin pump and probe signals were adjusted in order to extend the real physical sensing distance of a BOTDA sensor up to 120 km away from the sensor interrogation unit, employing a 240-km long loop of standard single-mode fiber (SSMF) with no repeater. To the best of our knowledge, this is the first time that distributed measurements are carried out over such a long distance with no active device inserted into the entire sensing loop, constituting a considerable breakthrough in the field.

Published in:
Proc. SPIE 8421
Presented at:
OFS2012 22nd International Conference on Optical Fiber Sensors, Beijing, China, 15-19 October 2012
Postdeadline paper

 Record created 2012-12-13, last modified 2018-03-18

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