| 基于双向拉曼放大的布里渊光时域分析系统 |
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| 引用本文： | 张超,饶云江,贾新鸿,苌亮,冉曾令.基于双向拉曼放大的布里渊光时域分析系统[J].物理学报,2010,59(8):5523-5527. |
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| 作者姓名： | 张超 饶云江 贾新鸿 苌亮 冉曾令 |
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| 作者单位： | (1)电子科技大学通信与信息工程学院,光纤传感与通信教育部重点实验室,成都 611731; (2)电子科技大学通信与信息工程学院,光纤传感与通信教育部重点实验室,成都 611731; 重庆大学光电工程学院,光电技术与系统教育部重点实验室,重庆 400044 |
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| 基金项目： | 国家高技术研究发展计划(批准号:2007AA01Z245)资助的课题. |
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| 摘 要： | 报道了一种基于双向拉曼放大的布里渊光时域分析系统(Brillouin optical time domain analyzer,BOTDA).利用双向拉曼抽运对信号光进行拉曼放大以补偿光纤损耗及布里渊抽运波的消耗,从而使光纤后端的测量分辨率得到改善,测量分辨率在整段传感光纤趋于一致,同时避免了调制不稳定性引起的频谱扩展,克服了传统BOTDA存在的信号强度指数下降的弊端,使传感精度得到进一步提高.实验实现了50 km传感距离, 温度分辨率达0.6 ℃,空间分辨率为50 m.实验测量并分析了基于双向拉曼放大的BOTDA信噪比和光功率分布特性.
关键词：
分布式光纤传感
受激拉曼放大
布里渊增益
布里渊光时域分析
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| 关 键 词： | 分布式光纤传感 受激拉曼放大 布里渊增益 布里渊光时域分析 |
| 收稿时间： | 2010-01-11 |
Brillouin optical time domain analyzer based on bi-directional Raman amplification |
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| Zhang Chao,Rao Yun-Jiang,Jia Xin-Hong,Chang Liang,Ran Zeng-Ling.Brillouin optical time domain analyzer based on bi-directional Raman amplification[J].Acta Physica Sinica,2010,59(8):5523-5527. |
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| Authors: | Zhang Chao Rao Yun-Jiang Jia Xin-Hong Chang Liang Ran Zeng-Ling |
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| Affiliation: | Key Laboratory of Optical Fiber Sensing and Communications, Ministry of Education, School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China;Key Laboratory of Optical Fiber Sensing and Communications, Ministry of Education, School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China; Key Laboratory of Optoelectronic Techn;Key Laboratory of Optical Fiber Sensing and Communications, Ministry of Education, School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China;Key Laboratory of Optical Fiber Sensing and Communications, Ministry of Education, School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China;Key Laboratory of Optical Fiber Sensing and Communications, Ministry of Education, School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China |
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| Abstract: | We report a Brillouin optical time domain analyzer (BOTDA) based on bi-directional Raman amplification in this paper. With the bi-directional Raman amplification, the loss of the optical fiber and the depletion of Brillouin pump light can be compensated for efficiently, hence the measurement resolution is improved at the end of the optical fiber significantly. The detected signal is stable along the whole length of the sensing fiber, free from the spectral broadening caused by the modulation instability and the problem of uneven ness of detected signals of the conventional BOTDA. The Raman amplification is very useful for enhancing the measurement accuracy. With the bi-directional Raman pump, a temperature resolution of 0.6 ℃ was achieved over a sensing distance of 50 km with a 50 m spatial resolution. The signal-to-noise ratio and the optical signal power distribution characteristics of the system have been studied by experiment. |
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| Keywords: | distributed optical fiber sensing stimulated Raman amplification Brillouin gain Brillouin optical time domain analyzer |
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