Principle and Application of the C-OTDR

LIU Zhong-hua; GONG Hao-min; WU Yan; ZHANG Yi-xin

doi:10.13756/j.gtxyj.2022.05.008

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Principle and Application of the C-OTDR

更新时间：2023-01-29

- Principle and Application of the C-OTDR
- Study on Optical Communications Issue 5, Pages: 43-48,65(2022)
- 作者机构：
  
  1.中国科学院声学研究所，北京　100190
  2.烽火通信科技股份有限公司，武汉　430073
  3.南京大学　光通信工程研究中心，南京　210023
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2022.05.008
  CLC： TN929.11
- Published：10 October 2022，
  
  Received：08 December 2021，
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LIU Zhong-hua, GONG Hao-min, WU Yan, et al. Principle and Application of the C-OTDR. [J]. Study on Optical Communications (5):43-48,65(2022)
DOI：

LIU Zhong-hua, GONG Hao-min, WU Yan, et al. Principle and Application of the C-OTDR. [J]. Study on Optical Communications (5):43-48,65(2022) DOI： 10.13756/j.gtxyj.2022.05.008.

摘要

传统光时域反射仪（OTDR）技术是通过背向瑞利散射功率来进行光纤检测的，在带有光中继放大的传输线路中，大多采用掺铒光纤放大器（EDFA）来补偿信号光的损耗，延长信号光的传输距离，由于EDFA在对信号进行放大的同时会产生自发辐射噪声，噪声的不断累积会使OTDR测量的信噪比快速下降，导致无法测量。文章主要阐述了相干光时域反射仪（C-OTDR）的技术原理，通过相干探测方法把探测到的信号光功率集中到中频，通过对该频率信号进行带通滤波即可滤除大部分噪声，使其能穿过EDFA不断延伸探测距离。文章同时提出采用频移键控方式来消除海缆长距离传输多级中继器级联带来的光浪涌问题，以便将其应用于海缆长距离传输系统中。通过自研C-OTDR研制，在模拟海缆多跨传输系统中，C-OTDR技术的实际测试达到3 000 km，完全具备实用条件。

Abstract

The traditional Optical Time Domain Reflectometry (OTDR) technology uses back Rayleigh scattering power for fiber detection. In transmission lines with optical amplifier

Erbium-Doped Fiber Amplifiers (EDFA) are mostly used to compensate for the loss of signal light and extend the transmission distance of the signal light. Since the EDFA amplifies the signal

it will generate spontaneous radiation noise

and the continuous accumulation of noise will rapidly decrease the signal-to-noise ratio measured by the OTDR. The paper mainly expounds the principle of Coherent Optical Time Domain Reflectometry (C-OTDR) technology. The detected signal optical power is concentrated to the intermediate frequency by the coherent detection method

and most of the noise can be filtered out by band-pass filtering the frequency signal. It can continuously extend the detection distance through the EDFA. We also propose to use the frequency shift keying method to eliminate the optical surge problem caused by the cascade of multi-stage repeaters in long-distance transmission of submarine cables. Through the development of self-developed coherent optical time domain reflectmeter

the actual test of C-OTDR technology in the simulated submarine cable multi-span transmission system has reached 3 000 km

which fully meets practical conditions.

关键词

相干光时域反射仪海缆中继器动态检测范围声光调制器频移键控

Keywords

C-OTDRsubmarine cablerepeaterdynamic detection rangeacousto-optic modulatorfrequency shift keying

references

Feng Z, Qiu S, Wei Y, et al. Coherent OTDR Used for Fibre Faults Detection[C]// 2009 Asia Communications and Photonics Conference and Exhibition (ACP). Shanghai, China: IEEE, 2009: WL86.

Furukawa S, Tanaka K, Koyamada Y, et al. Enhanced Coherent OTDR for Long Span Optical Transmission Lines Containing Optical Fiber Amplifiers[J]. IEEE Photonics Technology Letters, 1995, 7(5): 540-542.

Lu L, Song Y, Zhu F, et al. Dual Frequency Probe based Coherent Optical Time Domain Reflectometry[J]. Optics Communications, 2012, 258(10-11): 2492-2495.

吕立冬. 频分复用相干光时域反射系统研究[D]. 南京: 南京大学, 2012.

Lü L D. Research on Frequency Division Multiplexing Probe Based Coherent Optical Time Domain Reflectometry[D]. Nanjing: Nanjing University.

张旭苹, 吕立冬, 宋跃江. 多频探测光时分复用相干光时域反射仪方法和装置：中国，CN102412894A[P]. 2012-04-11.

Zhang X P, Lü L D, Song Y J. Multi-frequency Detection Optical Time Division Multiplexing Coherent Optical Time Domain Reflectometer Method and Device: China, CN102412894A[P]. 2012-04-11.

Zhang X, Hu J, Zhang Y. A Hybrid Single-end-access BOTDA and COTDR Sensing System Using Heterodyne Detection[J]. Journal of Lightwave Technology, 2013, 31(12): 1954-1959.

诸波, 丁铁骑. 海底光缆在线监测与相干光时域反射仪技术[J]. 江苏通信, 2001, 17(6): 27-30.

Zhu B, Ding T Q. On-line Monitoring of Submarine Optical Cable and Coherent Optical Time Domain Reflectometer Technology[J]. Jiangsu Communication, 2001, 17(6): 27-30.

Sumida M, Furukawa S, Tanaka K, et al. High-accurate Fault Location Technology Using FSK-ASK Probe Backscattering Reflectometry in Optical Amplifier Submarine Transmission Systems[J]. Journal of Lightwave Technology, 1996, 14(10): 2108-2116.

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