Balanced detection in Brillouin optical time domain analysis

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Year:
2014
Type of Publication:
In Proceedings
Authors:
  • Dominguez-Lopez, Alejandro
  • Lopez-Gil, Alexia
  • Martin-Lopez, Sonia
  • Gonzalez-Herraez, Miguel
Volume:
9157
Book title:
OFS2014 23rd International Conference on Optical Fiber Sensors
Pages:
915765-915765
Organization:
International Society for Optics and Photonics
Month:
June
BibTex:
Abstract:
We propose the use of balanced detection in Brillouin Optical Time Domain Analysis (BOTDA) sensors. Balanced detection can be effectively accomplished among the Stokes and anti-Stokes bands in the probe signal. This type of detection leads to a doubling of the trace amplitude and at least a √2 increase in signal to noise ratio over the conventional configuration. Moreover, it leads to a complete cancellation of the common-mode noise in the probe signal, including relative intensity noise in Raman-assisted configurations. We show all these benefits both theoretically and experimentally.