Study on the Technique of Brillouin Scattering Distributed Optical Fiber Sensing Based on Hilbert transform
希尔伯特变换处理的布里渊散射DOFS的研究

The scattering optical signal of BOTDR based on Brillouin scattering distributed sensor is very weak and have a frequency width of several decades megahertz, so it is hard to perform the traditional coherent demodulation. A optical heterodyne detection based on Hilbert transform is presented here. In detail,Brillouin back-scattering light is heterodyne detected with the reference right which is modulated by microwave electric optical modulator to produce frequency-adjustable light, then the detected photoelectric signal is demodulated using Hilbert transform. At last the distributed sensing signal with better S/N ratio is gained, which can enhance the performance of the sensor.