摘要
在单模光纤中 ,输入的激光功率大于阈值时 ,出现放大的反斯托克斯拉曼背向自发散射现象。实验发现 :放大的反斯托克斯拉曼背向自发散射具有温度效应 ,与反斯托克斯拉曼背向自发散射一样 ,放大的拉曼散射光的光子通量受到光纤温度的调制。反斯托克斯拉曼背向自发散射的放大效应抑制了单模光纤中的相干噪声 ,改善了系统的信噪比。实验还发现 ,放大的反斯托克斯拉曼背向自发散射空域曲线上放大的端点位置随激发功率的增高前移并具有一定的规律性。放大的反斯托克斯拉曼背向自发散射的温度效应作为一种新的测温原理 ,已应用于远程 30km分布光纤温度传感器系统。
Amplified anti-Stokes Raman spontaneous backscattering phenomena has been observed in single mode fiber, during input laser power is large than threshold power. In experiment it is discovered, the temperature effect of the amplified anti-Stokes Raman spontaneous backscattering is excised as some as anti-Stokes Raman spontaneous backscattering. The photon flux of amplified anti-Stokes Raman spontaneous backscattering is modulated by optical fiber temperature. The coherent noise of single mode fiber is restrained by the amplification effect of anti Stokes Raman backscattering, and the signal noise ratio of sensor system is improved. Experimental discover, the extremity point position on the amplified anti-Stokes Raman spontaneous backscattering space domain reflection curve is forward shifted with laser power raised, and obeys certain rule. The temperature effect of the amplified anti-Stokes Raman spontaneous backscattering has been applied to long range 30 km distributed optical fiber Raman temperature sensor system as a new principle of temperature measurement.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2004年第5期609-613,共5页
Acta Optica Sinica
基金
浙江省重点科研项目 (0 1110 1981)
韩国科学技术部韩中光技术研究中心基金资助课题
