Bipolar pulse coding for enhanced performance in Brillouin distributed optical fiber sensors

被引：2
|
作者：
Soto, Marcelo A. [1 ]
Le Floch, Sebastien [2 ]
Thevenaz, Luc [1 ]
机构：
[1] Ecole Polytech Fed Lausanne, Swiss Fed Inst Technol, Inst Elect Engn, SCI STI LT, Stn 11, CH-1015 Lausanne, Switzerland
[2] HE ARC, CH-2610 St Imier, Switzerland
来源：
22ND INTERNATIONAL CONFERENCE ON OPTICAL FIBER SENSORS, PTS 1-3 | 2012年 / 8421卷
关键词：
Stimulated Brillouin scattering; distributed optical fiber sensor; temperature sensing; strain sensing; BOTDA; MODULATION; RESOLUTION; RANGE;
D O I：
10.1117/12.974974
中图分类号：
TP7 [遥感技术];
学科分类号：
081102 ; 0816 ; 081602 ; 083002 ; 1404 ;
摘要：
We propose and experimentally demonstrate the possibility to use a pump signal based on bipolar pulse sequences using single-sideband suppressed-carrier (SSB-SC) modulation in Brillouin optical time-domain analysis (BOTDA) sensors. The SSB-SC modulated pump makes a sequential use of the Brillouin gain and loss spectra, increasing the intensity contrast of the measurements. The method is demonstrated using bipolar Golay codes along a 50 km sensing fiber and 2 m spatial resolution. Results indicate that the use of bipolar sequences provides a higher SNR enhancement and stronger robustness to pump depletion in comparison to BOTDA systems employing conventional unipolar sequences.
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页数：4
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