光通信技术, 2019, 43 (11): 29, 网络出版: 2019-11-21
一种超长跨距光纤传输链路监测方法
Monitoring method for ultra-long span optical fiber transmission link
超长跨距光链路 光时域反射仪 数字线性调频 短时分数阶傅里叶变换 ultra-long span fiber optical time domain reflection digital linear frequency modulation short-time fractional Fourier transform
摘要
为了解决超长跨距光纤传输的损耗测量的问题,提出一种新型基于数字线性调频-光时域反射(DLFM-OTDR)的测量方法,该方法能解决最大测量距离和空间分辨率之间的矛盾。DLFM-OTDR在发射端和接收端分别采用直接调制和直接检测,结构简单,不需要额外的光学器件,并且引入短时分数阶傅里叶变换(STFrFT)进行信号处理和噪声滤波。使用DLFM-OTDR开发板在实际光纤传输链路中进行了实验测试,以光纤链路长度为2×150 km的测量结果为例进行了分析,实验结果表明:DLFM-OTDR特别适合在单跨段很长的情况下,实现超长光纤链路的监测。
Abstract
In order to solve the problem of loss measurement of ultra-long span fiber transmission, this paper proposes a new measurement method based on digital linear frequency modulation optical time domain reflection(DLFM-OTDR). This method can solve the contradiction between the maximum measurement distance and the spatial resolution. The DLFM-OTDR uses direct modulation and direct detection at the transmitter and receiver respectively. The structure is simple and requires no additional optics. The method introduces the short-term fractional Fourier transform (STFrFT) for signal processing and noise filtering. the paper uses the DLFM-OTDR development board to perform experimental tests on the actual fiber transmission links. The measurement results of the fiber link length of 2×150 km are taken as an example, the experimental results show that the DLFM-OTDR is especially suitable for monitoring the ultra-long fiber link under the condition of long single span.
邓沌华, 张谱, 李蔚. 一种超长跨距光纤传输链路监测方法[J]. 光通信技术, 2019, 43(11): 29. DENG Zhuanhua, ZHANG Pu, LI Wei. Monitoring method for ultra-long span optical fiber transmission link[J]. Optical Communication Technology, 2019, 43(11): 29.