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提出一种基于半导体光纤环形激光器的混沌光纤围栏系统。在该系统中,激光器输出为具有帧结构的偏振混沌光,环形激光器中的一段光纤用作传感光纤。任意位置的入侵都会改变光纤的双折射分布状态,引起环形激光器初始状态的改变,由于混沌对初值的敏感性,激光器输出波形即刻被改变。通过相邻帧输出波形的互相关检测可实现入侵的检测。利用混沌环形激光器输出波形的帧型特点实现入侵定位的空间-时间转换。利用入侵位置与帧间互相关峰值的对应关系实现入侵的定位。该方法实时性好,抗干扰性强,检测结果不受周围环境变化影响。实验结果表明,在3 km左右的监测范围内定位误差约45 m,相对误差5%,且检测结果重复性良好。
A chaotic fiber fence system based on semiconductor fiber ring laser is proposed. In this system, the laser output is a polarized chaotic light with a frame structure and a section of optical fiber in the ring laser is used as a sensing optical fiber. Invasion at any position will change the birefringence distribution of the fiber, causing the initial state of the ring laser to change. Due to the sensitivity of chaos to the initial value, the laser output waveform is immediately changed. Intrusion detection can be achieved by cross-correlation detection of the output waveform of adjacent frames. Utilizing the frame type characteristic of the output waveform of chaotic ring laser to realize the space - time transformation of intrusion location. The intrusion location and the correlation between the peaks of the inter-frame correlation are used to locate the intrusion. The method has good real-time performance and strong anti-interference ability, and the test result is not influenced by the change of the surrounding environment. The experimental results show that the positioning error is about 45 m and the relative error is 5% within the monitoring range of about 3 km, and the repeatability of the test results is good.