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提出一种基于双并联马赫-曾德尔调制器(MZM)的新型四倍频光生毫米波技术,并用于矢量信号调制。传统的四倍频调制技术,由于数据信号同时调制到+2,-2阶边带上,拍频检测后两个边带上数据信号会产生相位叠加,只适用于不归零码(NRZ)等强度调制格式。提出的矢量信号调制技术将数据信号调制在一个-1阶边带上,另一个+3阶边带不携带数据,在拍频检测后幅度和相位信息被正确保留。同时,四倍频模块降低了传输过程中对电和光器件的带宽需求。理论分析和仿真结果表明,通过此方法产生的携带在60GHz载波上的6.25×108 symbol/s的四相相移键控(QPSK)信号,经过20km单模光纤传输后,误差向量幅度(EVM)损耗可以忽略。
A novel quadruplex optical millimeter-wave technique based on dual parallel Mach-Zehnder modulator (MZM) is proposed and used for vector signal modulation. Traditional quadruple-frequency modulation technology, as the data signal is modulated to the +2, -2 order sidebands simultaneously, the phase-superimposed data signals on the two sidebands after the beat frequency detection are applied only to the NRZ Equal intensity modulation format. The proposed vector signal modulation technique modulates the data signal on a -1st order sideband and the other +3th order sideband does not carry the data, the amplitude and phase information are correctly preserved after beat detection. At the same time, Quadruplex modules reduce the bandwidth requirements for electrical and optical components during transmission. The theoretical analysis and simulation results show that the QPSK signal of 6.25 × 108 symbol / s carried on the 60GHz carrier generated by this method passes through 20km single-mode optical fiber and the error vector magnitude (EVM) Loss can be neglected.