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Proceedings Paper

Raman-assisted DPP-BOTDA sensor employing Simplex coding with sub-meter scale spatial resolution over 93 km standard SMF
Author(s): Mohammad Taki; Marcelo A. Soto; Gabriele Bolognini; Fabrizio Di Pasquale
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Paper Abstract

Differential pulse-width-pair BOTDA technique is combined with bi-directional Raman amplification and Simplex coding to achieve sub-meter spatial resolution over very long sensing distances. Numerical simulations are used to optimize the power levels of the Raman pumps, avoiding nonlinear effects and pump depletion. Distortions in the Brillouin gain spectrum due to acoustic-wave pre-excitation are also avoided by numerical optimization of the pulse width and duty cycle of return-to-zero Simplex coding, providing significant SNR enhancement. We demonstrate 50 cm spatial resolution over 93 km of standard SMF with a strain/temperature accuracy of 34με/1.7 °C, respectively.

Paper Details

Date Published: 7 November 2012
PDF: 4 pages
Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84219M (7 November 2012); doi: 10.1117/12.970299
Show Author Affiliations
Mohammad Taki, Scuola Superiore Sant'Anna (Italy)
Marcelo A. Soto, Scuola Superiore Sant'Anna (Italy)
Swiss Federal Institute of Technology (Switzerland)
Gabriele Bolognini, IMM Institute (Italy)
Fabrizio Di Pasquale, Scuola Superiore Sant'Anna (Italy)

Published in SPIE Proceedings Vol. 8421:
OFS2012 22nd International Conference on Optical Fiber Sensors
Yanbiao Liao; Wei Jin; David D. Sampson; Ryozo Yamauchi; Youngjoo Chung; Kentaro Nakamura; Yunjiang Rao, Editor(s)

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