Raman-assisted DPP-BOTDA sensor employing Simplex coding with sub-meter scale spatial resolution over 93 km standard SMF

Mohammad Taki; Marcelo A. Soto; Gabriele Bolognini; Fabrizio Di Pasquale

doi:10.1117/12.970299

7 November 2012 Raman-assisted DPP-BOTDA sensor employing Simplex coding with sub-meter scale spatial resolution over 93 km standard SMF

Mohammad Taki; Marcelo A. Soto; Gabriele Bolognini; Fabrizio Di Pasquale

Author Affiliations +

Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 84219M (2012) https://doi.org/10.1117/12.970299
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

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.

Citation Download Citation

Mohammad Taki, Marcelo A. Soto, Gabriele Bolognini, Fabrizio Di Pasquale, "Raman-assisted DPP-BOTDA sensor employing Simplex coding with sub-meter scale spatial resolution over 93 km standard SMF", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84219M (7 November 2012); doi: 10.1117/12.970299; https://doi.org/10.1117/12.970299

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