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针对未编码离散多音频调制(DMT)的阶跃折射率塑料光纤(SI-POF)通信系统传输容量的计算,采用均匀功率谱密度(PSD)注入的方法,对SI-POF强度调制直接检测(IM/DD)的通信传输进行数学建模。借助一阶低通和高斯低通信道模型,推导出基于信噪比(SNR)间隔的信道容量和最佳使用带宽的数学计算模型。在不同使用带宽下对系统容量进行了理论分析与数值计算,并分别取不同长度的SI-POF进行实物传输测试。理论计算和传输实验表明了该计算模型的准确性,且信道容量与等效信噪比呈正向分布,与传输距离呈反向变化;使用优化的传输带宽可以减小传输速率的损失。该模型可有效用于SI-POF通信系统的容量计算和最优带宽预测。
Aiming at the calculation of transmission capacity of step-index plastic optical fiber (SI-POF) communication system with uncoded discrete multi-tone modulation (DMT), the method of direct power detection of SI-POF IM / DD) communication transmission mathematical modeling. Based on the first-order low-pass and Gaussian low-pass channel models, a mathematic model based on signal-to-noise ratio (SNR) interval channel capacity and optimal bandwidth is derived. The theoretical analysis and numerical calculation of the system capacity under different usage bandwidths are carried out, and the SI-POFs of different lengths are tested respectively for physical transmission. Theoretical calculations and transmission experiments show the accuracy of this model, and the channel capacity is positively distributed with the equivalent signal-to-noise ratio and varies inversely with the transmission distance. Using the optimized transmission bandwidth can reduce the transmission rate loss. The model can be effectively used for SI-POF communication system capacity calculation and optimal bandwidth prediction.