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利用光纤超荧光光源在1530nm附近具有较好的线性边带做边沿滤波器进行滤波解调,并对边沿滤波和光源的工作原理进行了深入分析。由于光源波长检测灵敏度对系统解调灵敏度起决定作用,所以系统光源采用了双程后向结构,在线性边带的下降沿2.5nm范围内功率随波长变化的灵敏度为-14.7μW/nm,线性拟合度达到了0.9995。系统采用全光结构,提高了解调速度。通过对地震检波的模拟测量,解调检测波长灵敏度可达-1.27pm/mV,应变分辨力为1.06με。实验表明,该解调系统具有操作简单、灵敏度高、稳定性好、性价比高且反应速度快,可以实现对地震信号的实时检测。
The use of fiber super-fluorescent light source near 1530nm has good linear edge band-edge filter to do the filtering and demodulation, and the edge filtering and light source operating principle in-depth analysis. Since the detection sensitivity of the light source plays a decisive role in the demodulation sensitivity of the system, the system light source adopts a two-way backward structure. The sensitivity of the power with wavelength change within the range of 2.5 nm on the falling edge of the linear sideband is -14.7 μW / nm, The fitting degree reached 0.9995. The system uses all-optical structure, improve the demodulation speed. Through the seismic measurement of the analog measurements, demodulation detection wavelength sensitivity up to -1.27pm / mV, strain resolution of 1.06με. Experiments show that the demodulation system has the advantages of simple operation, high sensitivity, good stability, high cost performance and fast response, and realizes the real-time detection of seismic signals.