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为实现短距离光传输系统在低成本下提升速率的目标,提出了一种基于强度调制/直接检测的偏振复用4阶脉冲幅度调制光纤传输系统.该系统结构简单,利用高效的数字信号处理算法,包括偏振态估计、混合偏振拍打噪声消除、基于最小均方误差算法的自适应多入多出技术滤波,可实现稳定可靠的均衡解复用.在Matlab和VPI软件联合仿真平台上,对224 Gbit/s PDM-PAM4系统进行了仿真验证.
In order to achieve the goal of short-distance optical transmission system to improve the rate under low cost, a polarization multiplexing fourth-order pulse amplitude modulation optical fiber transmission system based on intensity modulation / direct detection is proposed. The system is simple in structure and utilizes efficient digital signal processing The algorithm, including the estimation of the polarization state, the hybrid slap beat noise cancellation, the adaptive multiple-in-multiple filtering based on the least mean square error algorithm, can achieve stable and reliable equalization and demultiplexing.In Matlab and VPI software co-simulation platform, The 224 Gbit / s PDM-PAM4 system was verified by simulation.