光纤通信系统中光缆多路中继传输方法研究

Research on optical cable multi-relay transmission method in optical fiber communication system

为补偿光纤通信系统数据传输过程中损耗的光能量,提出一种光缆多路中继传输方法。分析光缆基带时域信号以及接收器与发射器的全光正交频分复用信号后,得到各路光缆子载波的数据与相位差。然后根据中继节点采集的能量集,建立最大传输功率的目标函数及约束条件,将中继节点能量分配转换成最大凸优化问题,从而得到各时隙中继节点的转发功率并配置各节点能量。基于光缆传输信道网络编码,获取时隙对应的中继接收信号,放大信号后根据传输功率实现光缆多路中继传输。仿真实验表明:在中继节点数量、光缆信道数量、信号传输速率不同的情况下,应用该方法后的误码比特数始终较低,说明该方法具备极佳的实践性能。

In order to compensate for the optical energy lost during data transmission in an optical fiber communication system, a method of optical fiber multiple-relay transmission is proposed. By analyzing the time domain signals of the optical fiber baseband in the optical fiber communication system, and all optical orthogonal frequency division multiplexing signals of receiver and transmitter, the data and phase difference of each optical fiber subcarrier are obtained. According to the energy set collected by relay nodes, the objective function and constraint conditions of the maximum transmitted power are established, and the energy distribution of relay nodes is converted into the maximum convex optimization problem, so as to obtain the forwarding power of each time slot relay node and configure the energy of each node. Based on the network code of optical cable transmission channel, the relay receiving signal corresponding to the time slot is obtained, and then the signal is amplified to realize optical cable multiple relay transmission according to the transmission power. The simulation results show that the error bit number of the proposed method is always low when the number of relay nodes, optical cable channels and signal transmission rates are different, indicating that the proposed method has excellent practical performance.