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在基于掺铒光纤-拉曼混合放大的可调光纤环形激光器的光纤布拉格光栅(FBG)传感系统结构基础上,提出了延长传感距离的新方法。该方法以环形掺铒光纤激光器作为光源,采用双波长拉曼放大的方法对信号进行低噪声的双向放大,系统中间的两段掺铒光纤再利用剩余的抽运功率产生自发辐射光和放大传感信号,使得整个系统能够在超长的传感距离上获得很高的信噪比。实验表明使用一只40 mW的掺铒光纤放大(EDFA)抽运源、一只170 mW的拉曼抽运源和一只2 W的拉曼抽运源,可以使整个系统的传感距离达到100km,并且传感系统的光纤布拉格光栅反射信号均能获得超过57 dB的优良信噪比,从而实现在超长距离上的光纤布拉格光栅传感。
Based on the structure of fiber Bragg grating (FBG) sensing system based on Erbium-doped fiber-Raman hybrid amplifier, a new method to extend the sensing distance is proposed. In the method, a ring-shaped erbium-doped fiber laser is used as a light source, and dual-wavelength Raman amplification is adopted to perform low-noise bidirectional amplification on the signal. Two erbium-doped optical fibers in the middle of the system reuse the remaining pumping power to generate spontaneous emission light and amplify A sense of signal, making the entire system in the long sensing distance to obtain a high signal-to-noise ratio. Experiments have shown that using a 40 mW EDFA pump, a 170 mW Raman pumping source and a 2 W Raman pumping source, the sensing distance of the entire system can be reached 100km, and fiber Bragg grating reflected signals of the sensing system can achieve good signal-to-noise ratio of more than 57 dB, so as to realize fiber Bragg grating sensing over an extremely long distance.