基于相位调制器(PM)级联高斯带通滤波器，提出了一种超宽带(UWB)多功能调制方案，可以实现通断键控(OOK)、脉冲极性调制(PBM)和脉冲形状调制(PSM)。该方案结构简单，只需单个光源，利用率较高，仅改变比特序列发生器(BSG)的编码就可实现三种UWB调制格式间的灵活切换；产生的三种信号只包含一个波长，在光纤中传输时无需复杂的非线性控制和色散管理。使用光通信软件Optisystem进行模拟，研究了光源功率、调制速率以及两支路PM和滤波器系统误差的影响，对OOK、PBM和PSM信号的传输性能进行了分析。结果表明，光源功率和调制速率在一定范围内变化时，可以获得性能最佳的UWB调制信号。

A UWB multi-functional modulator scheme based on cascade of phase modulation (PM) and filters was presented. This scheme was simple and could switch a variety of UWB modulation format flexibility by simple pre-coding to realize on-off keying(OOK), pulse bi-polar modulation(PBM), and pulse shape modulation(PSM). The generated three kinds of signal contained only a single wavelength, which can be transmitted over optical fiber without complex nonlinear control and dispersion management. By simulating through the software of Optisystem, the impact of light source power, modulation rate, and the system error of two PM modulators and filters on modulated signal was investigated. In addition, the transmission characteristics of modulated signals in single were also discussed. We found that the input power and modulation rate should between a certain range in order to get optimum UWB modulation signals.<<参考文献原文>Ge Lijia, Zeng Fanxin, Liu Yulin, et al. Ultra Wideband Impulse Radio[M]. Beijing: National Defence Industry Press, 2006: 5-6. (in Chinese)葛利嘉, 曾凡鑫, 刘郁林, 等. 超宽带无线通信[M]. 北京: 国防工业出版社, 2006: 5-6.