论文信息 - Coherent-detection-assisted BOTDA system without averaging using single-sideband modulated local oscillator signal

Coherent-detection-assisted BOTDA system without averaging using single-sideband modulated local oscillator signal

A novel setup for coherent-detection-assisted Brillouin optical time domain analysis (BOTDA) is proposed and demonstrated. Performance enhancement is enabled by a power-controllable local oscillator (LO) generated using single-side-band (SSB) modulation. Through employing a commercial coherent receiver and polarization diversity scheme, the Brillouin gain traces carried on a stable intermediate frequency (IF) are obtained in real time without any averaging and processed by digital signal processing (DSP) without the need of ultra-narrow optical band pass filter. A spatial resolution of 4 m and frequency uncertainty of 1.473 MHz are achieved over 40 km sensing range using a single scan.

[1] Marcelo A. Soto,et al. Modelling the depletion length induced by modulation instability in distributed optical fibre sensors , 2014, Other Conferences.

[2] Sonia Martin-Lopez,et al. Non-local effects in dual-probe-sideband Brillouin optical time domain analysis. , 2015, Optics express.

[3] Luc Thévenaz,et al. Modeling and evaluating the performance of Brillouin distributed optical fiber sensors. , 2013, Optics express.

[4] M. Sagues,et al. Self-Heterodyne Detection for SNR Improvement and Distributed Phase-Shift Measurements in BOTDA , 2012, Journal of Lightwave Technology.

[5] Xiaoyi Bao,et al. Recent progress in optical fiber sensors based on Brillouin scattering at university of Ottawa , 2011 .

[6] L. Thévenaz,et al. Simplex-coded BOTDA fiber sensor with 1 m spatial resolution over a 50 km range. , 2010, Optics Letters.

[7] Chao Lu,et al. Enhanced BOTDA performance by using commercial optical coherent receiver and digital signal processor , 2015 .

[8] K. Shimizu,et al. Development of a distributed sensing technique using Brillouin scattering , 1995 .

[9] Wei Pan,et al. Precise Brillouin gain and phase spectra measurements in coherent BOTDA sensor with phase fluctuation cancellation. , 2016, Optics express.

[10] S. Martín-López,et al. Extending the Real Remoteness of Long-Range Brillouin Optical Time-Domain Fiber Analyzers , 2014, Journal of Lightwave Technology.