Increasing robustness of bipolar pulse coding in Brillouin distributed fiber sensors

Optics Express
Zhisheng YangL Thevenaz

Abstract

The robustness of bipolar pulse coding against pump depletion issues in Brillouin distributed fiber sensors is theoretically and experimentally investigated. The presented analysis points out that the effectiveness of bipolar coding in Brillouin sensing can be highly affected by the power unbalance between -1's and + 1's elements resulting from depletion and amplification of coded pump pulses. In order to increase robustness against those detrimental effects and to alleviate the probe power limitation imposed by pump depletion, a technique using a three-tone probe is proposed. Experimental results demonstrate that this method allows increasing the probe power by more than 12.5 dB when compared to the existing single-probe tone implementation. This huge power increment, together with the 13.5 dB signal-to-noise enhancement provided by 512-bit bipolar Golay codes, has led to low-uncertainty measurements (< 0.9 MHz) of the local Brillouin peak gain frequency over a real remoteness of 100 km, using a 200 km-long fiber-loop and 2 m spatial resolution. The method is evaluated with a record figure-of-merit of 380'000.

References

Jan 19, 2010·Optics Letters·Marcelo A SotoLuc Thévenaz
Jul 20, 2010·Optics Express·Marcelo A SotoFabrizio Di Pasquale
Oct 14, 2010·Optics Express·Sonia Martin-LopezMiguel Gonzalez-Herraez
Aug 14, 2013·Optics Express·Marcelo A SotoLuc Thévenaz
Feb 12, 2014·Optics Express·Marcelo A Soto, Luc Thévenaz

❮ Previous
Next ❯

Citations

Apr 7, 2017·Optics Express·Chaodong WangDeming Liu
Apr 26, 2017·Optics Express·Haritz IribasSébastien Le Floch
Jan 31, 2019·Optics Express·Ruolin LiaoPerry Ping Shum
Jul 19, 2020·Optics Express·Sheng WangLuc Thévenaz
Mar 29, 2018·Sensors·Yun FuYunjiang Rao
Aug 19, 2018·Optics Express·Zhisheng YangMarcelo A Soto
Nov 15, 2020·Nature Communications·Xizi SunLuc Thévenaz

❮ Previous
Next ❯

Related Concepts

Related Feeds

Cell Imaging in CNS

Here is the latest research on cell imaging and imaging modalities, including light-sheet microscopy, in the central nervous system.

Bipolar Disorder

Bipolar disorder is characterized by manic and/or depressive episodes and associated with uncommon shifts in mood, activity levels, and energy. Discover the latest research this illness here.