作者：郑祥亮¹, 沈倩², 孙权社¹, 王恒飞¹, 赵发财¹

作者单位：1. 中国电子科技集团公司第四十一研究所, 山东 青岛 266555;
2. 青岛大学附属医院, 山东 青岛 265000

关键词：光纤环;相干光时域反射计;长度校准;光缆监测

摘要：

为满足相干光时域反射计（COTDR）在长距离通信状态监测中的长度校准需求，提出一种新型相干光时域反射计长度校准方法。该方法是利用光在光纤环中不断循环的原理，基于该原理研制COTDR长度校准装置，该装置是利用函数发生器发出的脉冲频率和脉冲宽度来控制光开关的开断时间，最终实现光在光纤环路中传播时间的控制。如果在光纤环路中加入光纤放大器，可以实现不同长度光纤链路的模拟，最终实现对相干光时域反射计长度的校准。实验结果表明：该装置中使用的光纤长度为150 km，光脉冲在光纤环路中最多能转7圈，因此该装置能够实现相干光时域反射计长度校准的最大范围为1050 km，其扩展不确定度为7.0 m，其中包含因子k为2。该方法不仅可以促进相干光时域反射计技术的发展，也为COTDR的长度校准提供思路。

Study on length calibration method of coherent optical time domain reflectometer
ZHENG Xiangliang¹, SHEN Qian², SUN Quanshe¹, WANG Hengfei¹, ZHAO Facai¹
1. The 41st Institute of China Electronics Technology Group Corporation, Qingdao 266555, China;
2. Affiliated Hospital of Qingdao University, Qingdao 265000, China
Abstract: In order to meet the length calibration requirements of coherent optical time domain reflectometer (COTDR) in state monitoring of long-distance communication, a new coherent optical time domain reflectometer length calibration method was proposed. The method utilized the principle that light circulated continuously in the fiber ring. And based on the principle, the COTDR length calibration device was developed. The device used the pulse frequency and pulse width emitted by the function generator to control the breaking time of the optical switch. Thereby it could realize the control of the propagation time of the light in the fiber loop. If a fiber amplifier was added to the fiber loop, simulation of fiber links of different lengths could be realized. Finally, the length calibration of the coherent optical time domain reflectometer was achieved. The experimental results showed that the length of the fiber used in the device is 150 km, and the optical pulse could be rotated up to 7 times in the fiber loop. Therefore, the maximum range of the coherent optical time domain reflectometer length calibration was 1050 km. Its extended uncertainty was 7.0 m, and the containing factor was 2. This method could not only promote the development of coherent optical time domain reflectometry technology, but also provided a good idea for COTDR length calibration.
Keywords: fiber coil;coherent optical time domain reflectometer;length calibration;optical cable monitoring
2019, 45(9):45-48  收稿日期: 2019-04-10;收到修改稿日期: 2019-05-07
基金项目: 国防军工技术基础科研项目（JSJL2016210A003）
作者简介: 郑祥亮(1987-),男,山东肥城市人,工程师,硕士,主要从事光通信与光纤长度定标方面的研究
参考文献
[1] 张旭苹, 张益昕, 王峰, 等. 基于瑞利散射的超长距离分布式光纤传感技术[J]. 中国激光, 2016, 43(7):8-21
[2] SUMIDA M. Optical time domain reflectometry using an M-ary probe and coherent detection[J]. Journal of Lightwave Technology, 1996, 14(11):2483-2491
[3] 饶云江. 长距离分布式光纤传感技术研究进展[J]. 物理学报, 2017, 66(7):139-157
[4] SHIMIZU K, HORIGUCHI T, KOYAMADA Y. Measurement of Rayleigh backscattering in single-mode fibers based on coherent OFDR employing a DFB laser diode[J]. IEEE Photonics Technology Letters, 1991, 3(11):1039-1041
[5] SUMIDA M. OTDR performance enhancement using a quaternary FSK modulated probe and coherent detection[J]. IEEE Photonics Technology Letters, 1995, 7(3):336-338
[6] ⅡDA H Y, KOSHIKIYA Y, ITO F,et al. High sensitivity coherent optical time domain reflectometry employing frequency division multiplexing[J]. Journal of Lightwave Technology, 2012, 30(8):1121-1126
[7] 姜宏伟, 吴远大. SOI基微环谐振可调谐滤波器[J]. 光电子·激光, 2011, 22(6):813-815
[8] 贾东方, 王衍勇, 包焕民, 等. 双波长全光自动增益箝制EDFA实验研究[J]. 光电子·激光, 2007, 18(3):273-295
[9] 刘爱明, 吴重庆, 龚岩栋, 等. 基于SOA的双端口全光光开关[J]. 北京交通大学学报, 2004, 28(5):28-31
[10] 赵焕东, 池浩. 时隙光分组交换网络中一种新的光缓存优化配置方案[J]. 光子学报, 2004, 33(4):452-455
[11] 高业胜, 郑光金. 光时域反射计校准及其测量不确定度分析[J]. 宇航计测技术, 2010, 30(5):73-78
[12] 刘伟, 肖石林. 一种改进的智能化EDFA设计[J]. 光通信技术, 2008, 10(5):31-34
[13] 蒙红云, 赵春柳, 杨石泉, 等. 基于光纤环行镜的掺铒光纤放大器增益平坦化[J]. 中国激光, 2002, 29(9):805-807
[14] 余巧燕, 曹文华. 基于EDFA的超短光脉冲放大技术及其进展[J]. 激光与红外, 2009, 39(7):703-706