中国激光, 2014, 41 (12): 1205007, 网络出版: 2014-10-30
布里渊光时域反射系统中布里渊散射信号的前向和后向拉曼放大研究
Forward and Backward Raman Amplification of Brillouin Scattering Signal in Brillouin Optical Time Domain Reflectometer System
光纤光学 拉曼放大 布里渊光时域反射 受激布里渊散射 fiber optics Raman amplification Brillouin optical time domain reflection stimulated Brillouin scattering
摘要
由于布里渊光时域反射(BOTDR)系统中布里渊散射信号非常微弱,常常导致传感距离受限,进而影响系统的信噪比和测量精度。因此,提出对BOTDR系统中布里渊散射信号的前向和后向拉曼放大进行研究。实验结果表明,后向抽运拉曼放大的受激布里渊散射(SBS)阈值要比前向抽运的高;当抽运功率为700 mW时,前向抽运放大增益可达13.78 dB,随后出现二阶布里渊散射谱线,使得放大增益开始下降;当抽运功率为1000 mW时,后向抽运放大增益可达16.33 dB,随后放大增益仍有增长的趋势,有利于对布里渊背向散射信号持续放大。
Abstract
In Brillouin optical time domain reflectometer (BOTDR) system, the Brillouin scattering signal is so weak that the sensing distance is usually limited and thus the signal to noise ratio and measurerent precision are influenced in system. Therefore, the forward and backward Raman amplification of Brillouin scattering signal in BOTDR system is studied. The experimental results show that the stimulated Brillouin scattering (SBS) threshold by the backward pump Raman amplification is higher than that by the forward pump Raman amplification. When the pump power is 700 mW, the gain of the forward pump is about 13.78 dB, then the amplified gain will decrease because of the occurence of the second order Brillouin scattering spectral line. When the pump power is 1000 mW, the gain of the backward pump is about 16.33 dB, and it still has the growth trend subsequently, which is beneficial to the continuous amplification of the Brillouin backscattering signal.
毕卫红, 杨希鹏, 李敬阳, 付兴虎, 付广伟. 布里渊光时域反射系统中布里渊散射信号的前向和后向拉曼放大研究[J]. 中国激光, 2014, 41(12): 1205007. Bi Weihong, Yang Xipeng, Li Jingyang, Fu Xinghu, Fu Guangwei. Forward and Backward Raman Amplification of Brillouin Scattering Signal in Brillouin Optical Time Domain Reflectometer System[J]. Chinese Journal of Lasers, 2014, 41(12): 1205007.