| 布里渊光时域反射计中电光调制器的调制特性与控制 |
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| 引用本文： | 张旭苹,张凯,王顺. 布里渊光时域反射计中电光调制器的调制特性与控制[J]. 光电子．激光, 2012, 0(1): 15-20 |
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| 作者姓名： | 张旭苹 张凯 王顺 |
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| 作者单位： | 南京大学光通信工程研究中心;南京大学光通信工程研究中心;南京大学光通信工程研究中心 |
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| 基金项目： | 国家自然科学基金(61027017、60644001);国家重点基础研究发展“973”计划(2010CB327803)资助项目 |
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| 摘 要： | 在布里渊光时域反射计（BOTDR）中,电光调制器（EOM）的工作点会随着外部环境变化而发生漂移,这将影响BOTDR系统的测量精度及测量稳定性。本文在分析BOTDR系统中EOM调制特性的基础上,提出了一种控制EOM工作点的方法,使用数字信号处理器作为控制核心,采用＂步进跟随＂的算法。实验结果表明,本文方法可以使EOM长期...
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| 关 键 词： | 光纤传感 布里渊光时域反射计(BOTDR) 电光调制器(EOM) 偏置电压控制 数字信号处理器 |
Modulation performance and control of electro-optic modulator for the distributed Brillouin sensing system |
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| ZHANG Xu-ping,ZHANG Kai and WANG Shun. Modulation performance and control of electro-optic modulator for the distributed Brillouin sensing system[J]. Journal of Optoelectronics·laser, 2012, 0(1): 15-20 |
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| Authors: | ZHANG Xu-ping ZHANG Kai WANG Shun |
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| Affiliation: | Institute of Optical Communication Engineering,Nanjing University,Nanjing 210008,China;Institute of Optical Communication Engineering,Nanjing University,Nanjing 210008,China;Institute of Optical Communication Engineering,Nanjing University,Nanjing 210008,China |
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| Abstract: | In a Brillouin optical-fiber time-domain reflectometry(BOTDR) system,it is convenient to obtain the Brillouin signal by coherent detection,which needs an electro-optic modulator(EOM) to shift the frequency of the reference signal.However the bias point of the(EOM) may slowly change due to many external factors,which leads to the instability of the modulation efficiency.In this paper,a novel and simplified stabilization technique based on digital signal processor and step-by-step tracking algorithm is proposed.Experimental results show that the EOM′s bias point can be locked quite well in 24 h and the accuracy and the stabilization of the sensing system can be improved obviously. |
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| Keywords: | optic fiber sensing Brillouin optical time domain reflectometry(BOTDR) electro-optic modulator(EDM) voltage bias point digital signal processor |
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