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Brillouin-Based Distributed Temperature Sensor Employing Pulse Coding

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4 Author(s)
Soto, Marcelo A. ; Scuola Superiore Sant''Anna, Pisa ; Sahu, P.K. ; Bolognini, Gabriele ; Di Pasquale, F.

A distributed temperature sensor based on spontaneous Brillouin scattering and employing optical pulse coding has been implemented and characterized using a direct-detection receiver. The signal-to-noise ratio (SNR) enhancement provided by coding is analyzed, along with the influence of coding in stimulated Brillouin threshold. Simplex-coding using 127 bit codeword provides up to 7 dB SNR improvement, allowing for temperature sensing over 21 km of dispersion shifted fiber with 3.1 K resolution and 40 m spatial resolution, permitting to avoid the use of optical pulse amplification.

Published in:

Sensors Journal, IEEE  (Volume:8 ,  Issue: 3 )