Collection Of theses on high power laser and plasma physics, 2007, 5 (1): 233, Published Online: Sep. 18, 2008
Detection of Spontaneous Brillouin Backscattered Power in Distributed Optical Fiber Sensor System Based on High Frequency Microwave Technology
测量与计量 光纤传感器 布里渊散射 电光调制 相干检测 measurement and metrology optical fiber sensors Brillouin scattering electro-optical modulation optical coherent detection
Abstract
The technique of Brillouin scattering distributed optical fiber sensing has been presented. Optical heterodyne detection was used to detect the weak Brillouin back scattering signal based on single longitudinal mode distributed feedback (DFB) laser and electric optical modulation technique. The scattering signal was amplified effectively by improving the filter and erbium doped fiber amplifier (EDFA). The 11 GHz radio-frequency (RF) signal of Brillouin back scattering is gathered and averaged. The experimental procedures and results are presented. The results show that the peak power of Brillouin back scattering at 11 GHz can reach 50 mV, and the intensity noise of light source induced the system's signal to noise ratio (SNR) decreased greatly, which reduced the difficulty of signal process in demodulation system. The experimental results confirm that the configuration is feasible.
An Sun, Jialin Chen, Guoyang Li, Li Wang, Liping Chang, Zunqi Lin. Detection of Spontaneous Brillouin Backscattered Power in Distributed Optical Fiber Sensor System Based on High Frequency Microwave Technology[J]. Collection Of theses on high power laser and plasma physics, 2007, 5(1): 233.