一种利用布里渊谱宽确定光纤SBS阈值的新方法

发布时间：2018-01-09 23:04

本文关键词：一种利用布里渊谱宽确定光纤SBS阈值的新方法　出处：《红外与激光工程》2017年02期 　论文类型：期刊论文

【摘要】：针对传统的通过功率信息测量所得受激布里渊散射阈值偏高的问题,提出了一种利用布里渊散射谱宽确定光纤受激布里渊散射阈值的新方法。分析了本地外差检测的原理及布里渊散射谱宽与入纤光功率的关系;设计了基于本地外差检测的布里渊散射谱测量系统,在常温下对不同长度标准单模光纤的受激布里渊散射阈值进行了测量。实验结果表明:当光纤长度分别为48.8 km和9.5 km时,根据功率信息获得的受激布里渊散射阈值对应的布里渊散射谱宽均接近恒定值10 MHz,此时已发生严重的泵浦耗尽效应。利用布里渊散射谱表现出的低入纤功率时谱宽的线性下降特性和高入纤功率时谱宽的功率无关特性确定的两种光纤长度下的受激布里渊散射阈值分别为1.12 m W和3.8 m W,对应的布里渊散射谱宽分别为24.86 MHz和23 MHz,其值近似等于布里渊自然线宽。文中的研究结果对布里渊光时域反射系统最大入纤光功率的确定具有重要的参考价值。
[Abstract]:In order to solve the problem of high threshold of stimulated Brillouin scattering by traditional measurement of power information. A new method for determining stimulated Brillouin scattering threshold by Brillouin scattering spectrum width is proposed. The principle of local heterodyne detection and the relationship between Brillouin scattering spectrum width and fiber power are analyzed. A Brillouin scattering spectrum measurement system based on local heterodyne detection is designed. The stimulated Brillouin scattering threshold of standard single-mode fiber of different lengths is measured at room temperature. The experimental results show that the fiber length is 48.8 km and 9.5 km, respectively. The Brillouin scattering spectrum width corresponding to the stimulated Brillouin scattering threshold obtained from the power information is close to a constant value of 10 MHz. A serious pump depletion effect has occurred at this time. The two optical fiber lengths determined by the linear descent of the spectral width at low input power and the power-independent characteristics of the spectral width at high fiber entry power by Brillouin scattering spectrum are used in this paper. The threshold of stimulated Brillouin scattering is 1.12, respectively. MW and 3.8 MW. The corresponding Brillouin scattering spectrum widths are 24.86 MHz and 23 MHz, respectively. Its value is approximately equal to the Brillouin natural linewidth. The results in this paper have important reference value for determining the maximum incoming optical power of Brillouin optical time domain reflectance system.
【作者单位】：华北电力大学电子与通信工程系;
【基金】：国家自然科学基金(61377088) 河北省自然科学基金(F2014502098,F2015502059) 中央高校基本科研业务费专项资金(2014XS77)
【分类号】：TN253
【正文快照】： 中央高校基本科研业务费专项资金(2014XS77)0引言受激布里渊散射(SBS)是光纤中的泵浦波、斯托克斯(Stokes)波通过声波发生的非线性作用,是光纤中一种常见的非线性现象[1-2]。当光纤注入功率增加到一定程度时,SBS将大部分泵浦波功率转移至背向Stokes波,从而限制光纤传感和光纤

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