摘要
提出了一种提高长距离光纤布喇格光栅信噪比以进行准分布测量的新方法.该方法基于掺铒光纤/喇曼混合放大的光纤激光器结构,掺铒光纤和滤波器构成的环形结构产生激光作为光源,喇曼光纤放大器对布喇格光栅信号进行低噪音的双向放大,置于远处的掺铒光纤利用剩余的泵浦功率产生自发辐射光和放大传感信号,为远处掺铒光纤之后的布喇格光栅传感器提供信号光以及补偿由于长距离传输造成的光纤损耗.实验显示,与使用宽带光源的传感方式相比,系统的性能得到显著提高,仅使用小功率泵浦,分布在50 km光纤上的FBG均获得了超过58 dB的优良信噪比.
A novel fiber laser method based on the combination of the bidirectional Raman amplification and the dual Erbium-doped fiber （EDF） based configurations is proposed for performance enhancement of longdistance fiber Bragg grating （FBG） sensor systems to achieve quasi-distributed measurement. The laser produced by the ring made up of EDF and filter is the light source, the Raman fiber amplifier is used for achieving low-noise bidirectional amplification of FBG signals while the EDF arranged remotely is used for the illumination of remotely-located FBG sensors beyond the second EDF arrangement and the compensation of the fiber loss due to long-distance transmission. Experimental results show that the performance of the sensor system has been improved significantly. An excellent SNR of-58 dB has been achieved for a 50 km transmission distance with low power pump.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2007年第9期1656-1659,共4页
Acta Photonica Sinica
基金
国家自然科学基金重点项目(60537040)
重庆市自然科学基金重点项目(8415)资助
