【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。更多还原

【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.更多还原