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超高灵敏度的信号探测在石油勘探、地震预报和安全监测等领域都具有重要的应用价值。近年来出现了一种以分布反馈(DFB)光纤激光器为传感元件的新一代光纤传感器,它具有尺寸小、输出激光信号极窄的光谱线宽和极低的噪声等优势,与高分辨率波长解调技术结合可以达到极高的探测灵敏度。介绍了在光纤激光传感技术及其应用技术方面的研究进展,包括线宽仅为3kHz、尺寸仅为3.6cm的窄线宽低噪声DFB光纤激光器的研制及其测试,波长分辨率达3.5×10-7pm/Hz1/2的超高分辨率波长解调系统,基于密集波分复用的光纤激光传感网络,以及相关技术在水声和地震波探测中的应用研究。
Ultra-sensitive signal detection has important application value in the fields of petroleum exploration, earthquake prediction and safety monitoring. In recent years, a new generation of optical fiber sensor with distributed feedback (DFB) fiber laser sensor has been proposed. It has the advantages of small size, extremely narrow spectral linewidth of output laser signal and extremely low noise. Compared with high resolution Wavelength demodulation technology can achieve high detection sensitivity. The research progress of fiber laser sensing technology and its application technology is introduced, including the research and testing of narrow linewidth and low noise DFB fiber laser with a linewidth of only 3kHz and a size of only 3.6cm with a wavelength resolution of 3.5 × Ultra-high resolution wavelength demodulation system of 10-7pm / Hz1 / 2, fiber laser sensing network based on dense wavelength division multiplexing, and application research of related technologies in underwater acoustic and seismic wave detection.