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针对光载无线通信系统中并联双驱动马赫-曾德尔调制器(MZM)的四倍频方案产生功率周期性衰落效应,以及传输距离短的不足,提出了一种改进的抑制双边带调制产生光毫米波方案。首先在并联MZM后用波分复用(WDM)分离抑制双边带信号的两个边带,将基带信号调制到下边带,再与未调信号耦合后产生光毫米波,最后传输至加入前置补偿的光纤链路中。用optisystem7.0软件对改进方案进行了仿真,结果表明用此类结构不仅能得到高纯度的四倍频光毫米波,还可以消除上述的效应,实现了更长距离、更佳性能的传输。
Aiming to the periodic power fading effect and the short transmission distance of quadruple frequency double parallel Mach-Zehnder modulator (MZM) in optical wireless communication system, an improved double-sideband modulation system Millimeter wave program. Firstly, the two sidebands of the suppressed bilateral band signal are separated by WDM after the parallel MZM, the baseband signal is modulated to the lower sideband, and then coupled with the unregulated signal to generate the optical millimeter wave, and finally transmitted to join the front Compensation in the fiber link. The improved scheme was simulated with optisystem7.0 software. The results show that this kind of structure can not only obtain high purity quadruple-frequency optical millimeter wave, but also eliminate the above-mentioned effect and achieve longer distance and better performance transmission.