外部调制光相干域分布式光纤传感技术研究

项目名称： 外部调制光相干域分布式光纤传感技术研究

项目编号： No.61275097

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 何祖源

作者单位： 上海交通大学

项目金额： 86万元

中文摘要： 分布式光纤传感技术运用时间域、频率域或相干域的操作，实现沿着光路的空间位置的分辨，获取被测量的分布信息。本项目申请者在日本东京大学学习和任教期间，共同开创和发展了通过控制连续光的相干特性而实现位置分辨的相干域分布式光纤传感技术，目前在空间分辨率和测量速率等性能上处于世界领先地位。该技术由于采用光源频率直接调制，其性能的进一步提高受限于市场上可获得的快速宽带可调谐激光器的性能。本项目在原有技术的基础上，导入两种新型的外部调制方法。一种采用外部频率调制，通过改变频率调制参数进行位置分辨；另一种采用伪随机二进制序列（PRBS）外部强度调制，通过电信号的延迟进行位置分辨。由此突破光源调谐性能的限制，大幅提高相干域分布式光纤传感技术的性能。这种技术不仅能够对光纤到户通信线路的维修、光纤器件的诊断等光通信业界难题的解决，提供有效的方法，而且在灵巧材料的实现以及结构安全监视等方面，都有着广泛的应用。

中文关键词： 外部调制OCDR法；布里渊散射；分布式光纤传感技术；光频域反射仪；

英文摘要： By manipulation in time-domain, frequency-domain, or coherence-domain, the distributed fiber-optic sensing technology realizes spatially resolved measurement along the optical path, and obtains the distribution information of measurands. The proposer of this research proposal, when studying and working in the University of Tokyo, jointly created and developed a coherence domain distributed fiber-optic sensing technique by controlling the coherence of continuous lightwave to realize spatial resolving, which is in the world-leading position in performance such as spatial resolution and measurement speed. Utilizing direct frequency modulation of the laser source, further improvement on the performance of the technique is limited by the property of available rapidly broadband-tunable laser source. Based upon the world-leading developed technique, this proposal introduces two novel external modulation methods. One adopts external frequency modulation, and realizes spatial resolving by adjusting the parameters of the frequency modulation. The other uses external intensity modulation by pseudo-random binary sequence (PRBS) signal where spatial resolving is done by delaying the modulation signal. In this way, the performance of the coherence domain distributed fiber-optic sensing technology can be enhanced greatly by br

英文关键词： OCDR using external modulation；Brillouin scattering；distributed optical fiber sensing；optical frequency domain reflectometry；