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Raman-based distributed temperature sensor with simplex coding and link optimization

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7 Author(s)
Jonghan Park ; Sch. of Electr. Eng. & Comput. Sci., Seoul Nat. Univ., South Korea ; G. Bolognini ; Duckey Lee ; Pilhan Kim
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In this letter, a coded, Raman-based distributed temperature sensor system using 255-bit Simplex coded optical time domain reflectometry (OTDR) and optimized sensing link composed of cascaded fibers with different Raman coefficients, is proposed. This system is compared to a system with an uncoded OTDR on standard single-mode fiber, demonstrating significant enhancement in the interrogation distance (19.5 km from coding gain, and 9.6 km from link optimization). Total sensing range of 37 km at 17-m/3-K spatial/temperature resolution were achieved, while employing conventional low power (80 mW) laser diodes

Published in:

IEEE Photonics Technology Letters  (Volume:18 ,  Issue: 17 )