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提出了对基于扫描激光器的光纤布拉格光栅(FBG)传感系统进行掺铒光纤(EDF)/双波拉曼混合放大的方法,大幅度提高了该光纤布拉格光栅传感系统的传输距离。该方法以高功率扫描激光器作为光源,采用双波长拉曼放大的方法对信号进行低噪声双向放大,再利用系统中间的两段掺铒光纤,将剩余的拉曼抽运功率用来产生自发辐射光和放大传感信号,使得整个系统能在超长的传感距离上获得良好的信噪比(SNR)。实验表明使用一台扫描激光传感分析仪、一只170mW的拉曼抽运和一只2W的拉曼抽运,可以使传感距离达到100km以上,并且传感系统的光纤布拉格光栅反射信号均能获得超过7dB的良好信噪比,从而实现在超长距离上的光纤布拉格光栅传感。
An EDF / dual-Raman hybrid amplification method based on scanning laser fiber Bragg grating (FBG) sensing system is proposed, which greatly improves the transmission distance of this fiber Bragg grating sensing system. The method uses a high-power scanning laser as a light source, adopts a dual-wavelength Raman amplification method to perform low-noise bidirectional amplification on a signal, and utilizes two erbium-doped optical fibers in the middle of the system to generate the remaining Raman pumping power for generating spontaneous radiation Light and amplification of the sensing signal allows the entire system to achieve a good signal-to-noise ratio (SNR) over long sensing distances. Experiments show that the use of a scanning laser sensor analyzer, a 170mW Raman pumping and a 2W Raman pumping, the sensing distance can be achieved more than 100km, and sensing system fiber Bragg grating reflection signal Good signal-to-noise ratio of over 7dB is achieved for fiber Bragg grating sensing over very long distances.