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机构地区:[1]电子科技大学宽带光纤传输和通信网技术教育部重点实验室
出 处:《中国激光》2007年第5期680-683,共4页Chinese Journal of Lasers
基 金:国家自然科学基金(60537040)资助项目
摘 要: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。A novel method of Er-doped optical fiber (EDF) dual wavelength Raman hybrid amplification for fiber Bragg grating (FBG) sensor system based on swept laser is proposed for achieving ultra-long distance quasidistributed measurement. Such a method employs a high power swept laser as the light source. Dual-wavelength Raman fiber amplification is adopted to achieve low-noise bidirectional amplification of FBG signals, and two sections of EDFs arranged along the fiber link remotely are used for generation of amplified spontaneous emission (ASE) light to illuminate remotely-located FBG sensors and also amplification of sensor signals with the residual Raman pump power, making the whole sensor system capable of obtaining reasonably good signal-noise-ratio (SNR) for an ultra-long distance. The experimental results show that an optical SNR of -7 dB has been achieved for a 100 km transmission distance with a swept laser, a low Raman pump power of 4170 mW at wavelength of 1455 nm and a Raman pump power of -2 W at wavelength of 1480 nm, which leads to realization of FBG-based sensing along ultra-long distance.
关 键 词:光纤光学 光纤传感器 光纤布拉格光栅传感器 扫描激光器 拉曼放大 掺铒光纤放大
分 类 号:TP212.14[自动化与计算机技术—检测技术与自动化装置]
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