中国激光, 2019, 46 (10): 1004006, 网络出版: 2019-10-25
基于光纤环的混沌光时域反射仪动态范围增大 
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Improving Dynamic Range of Chaos Optical Time Domain Reflectometry Using Fiber Ring
测量 混沌光时域反射仪 光纤环 动态范围 多光束干涉 measurement chaos optical time domain reflectometry fiber ring dynamic range multibeam interference
摘要
外腔反馈半导体激光器产生的混沌具有明显的弛豫振荡特征,低频段能量过低,限制了混沌光时域反射仪(OTDR)的动态范围。提出了一种光纤环结构,用以增大混沌OTDR的动态范围。通过实验和数值模拟,发现混沌光经过光纤环时会发生多光束干涉,并通过延迟自拍频效应提高了混沌信号低频段能量。实验测量结果表明:在200 MHz探测带宽下,基于光纤环的混沌OTDR动态范围增大了5 dB。
Abstract
The chaos generated by the external-cavity feedback semiconductor laser has an obvious relaxation oscillation and the energy of the low-frequency band is low, limiting the dynamic range of chaos optical time domain reflectometry (OTDR). An optical fiber ring structure is proposed herein to improve the dynamic range of the chaos OTDR. Experiments and numerical simulation find that multibeam interference occurs when the chaotic light passes through the fiber ring. Moreover, the energy of the low-frequency band is improved by delaying the self-beat frequency effect. The experimental detection results show that the dynamic range of the chaos OTDR increases by 5 dB when the fiber ring is used under a 200-MHz detection bandwidth.
胡志宏, 赵彤, 贺培鑫, 王冰洁, 王安帮, 王云才. 基于光纤环的混沌光时域反射仪动态范围增大[J]. 中国激光, 2019, 46(10): 1004006. Zhihong Hu, Tong Zhao, Peixin He, Bingjie Wang, Anbang Wang, Yuncai Wang. Improving Dynamic Range of Chaos Optical Time Domain Reflectometry Using Fiber Ring[J]. Chinese Journal of Lasers, 2019, 46(10): 1004006.
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