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在光纤承载射频(RoF)系统中,针对普通单边带信号中光载波分量和光边带分量之间功率差较大的问题,提出了一种利用集成马赫-曾德尔调制器(MZM)生成单边带信号的改进方法。通过调节该集成MZM中直流臂上的直流偏压,对于任意调制指数,单边带信号中两个分量的功率都能够平衡,即得到最优的0 dB载边比(CSR)。理论分析了集成MZM处于不同损耗状态时载边比的变化情况。仿真结果证实了在不同损耗状态下调节直流偏压可以使单边带信号中光载波和光边带的功率平衡。仿真结果还表明,当集成MZM中的直流偏压偏离最佳值时,如果将偏压漂移控制在5%范围内,RoF系统具有较好的稳定性。
In the RoF system, aiming at the problem of large power difference between optical carrier and optical sideband component in normal single-sideband signal, this paper proposes a method to generate single-carrier signal by using integrated Mach-Zehnder modulator (MZM) Sideband signal improvement method. By adjusting the DC bias on the DC arms in the integrated MZM, the power of both components in the single-sideband signal is balanced for any modulation index, resulting in an optimal 0 dB carrier-to-edge ratio (CSR). Theoretical analysis of the integrated MZM in different loss state when the load-carrying ratio changes. The simulation results show that adjusting the DC bias under different loss conditions can balance the power of the optical carrier and the optical sideband in the single sideband signal. The simulation results also show that the RoF system has good stability when the bias bias in the integrated MZM deviates from the optimum value and the bias drift is controlled within 5%.