对传输容量为16×40 Gbit/s、传输距离为500~2 000 km的DWDM(密集波分复用)系统进行了研究。分析了不同调制方式(CSRZ(载波抑制归零)码、DRZ(双二进制归零)码和MDRZ(改进的双二进制归零)码)、不同色散补偿方案(前置、后置和中间色散补偿)对系统传输性能的影响。仿真结果表明, 当传输距离超过1 500 km后, MDRZ码能够很好地抑制FWM(四波混频)效应, 提高系统性能; 中间色散补偿方案比前置色散补偿和后置色散补偿有更好的补偿效果。

Chaotic laser radar based on correlation detection is a high-resolution measurement tool for remotely monitoring targets or objects. However, its effective range is often limited by the side-lobe noise of correlation trace, which is always increased by the randomness of the chaotic signal itself and other transmission channel noises or interferences. The experimental result indicates that the wavelet denoising method can recover the real chaotic lidar signal in strong period noise disturbance, and a signal-to-noise ratio of about 8 dB is increased. Moreover, the correlation average discrete-component elimination algorithm significantly suppresses the side-lobe noise of the correlation trace when 20 dB of chaotic noise is embedded into the chaotic probe signal. Both methods have advantages and disadvantages.

实验和理论研究了混沌激光雷达的抗干扰性能。利用光反馈半导体激光器混沌激光雷达样机，分别研究了其对混沌激光信号、连续波调制雷达信号和脉冲雷达信号的抗干扰能力。实验与数值模拟结果表明，在不采取任何抗干扰措施的情况下，混沌激光雷达对同种体制混沌信号干扰以及不同种体制的正弦调制激光信号和脉冲激光信号干扰都有较大容忍限度，具有天然的抗干扰能力，且其测距精度在混沌激光雷达样机量程范围内不受干扰信号影响。分析了利用简单平均算法进一步提高混沌激光雷达抗干扰性能的可行性。