中文摘要：

综合比较多信道数字RoF和模拟RoF的传输系统方案和性能，并分析数字RoF如何利用带通采样的特点实现只需要用ADC和DAC就可以完成频率迁移。推导和分析多信道模拟RoF与数字RoF受到的非线性影响，并通过Optisystem进行仿真。理论和仿真都证明DRoF链路比模拟RoF链路有着更好的SNR性能和动态范围，更适合远距离传输。

英文摘要：

In this article, a comprehensively comparision is made between multichannel digital RoF and analog RoF transmission scheme and their performances,and it has been discussed about how to realize the frequency conversion only with a single ADC or DAC under the theory of bandpass sampling.Then to simulate and to comprehensively make comparision about the nonlinearity products, and the result was simulated by OptiSys- tem. Both theory and experiment suggest a better performance and cost-effective in digital RoF link, especially for long-haul fiber radio networks.