中文摘要：

提出了一种基于半导体光放大器（SOA）中交叉增益调制（XGM）效应产生高斯单边信号（monocycle）脉冲的方案。该方案只需要单个外部光源和单个SOA，结构简单；采用相向的工作方式可以改善输出信号的消光比；输出的monocycle信号光只含有一个波长，在光纤传输过程中上下脉冲不会引入时间差。利用Optisystern7．0软件对方案进行了仿真，研究了输入信号脉冲宽度、光功率及其波长、SOA注入电流对产生的monocycle脉冲的影响。结果表明，本文方案对输入信号脉冲宽度具有良好的容忍度，对波长变化不敏感。给出了光源功率和SOA注入电流的优化范围。

英文摘要：

We propose an ultra-widehand monocycle signal source based on the cross-gain modulation （XGM） in a semiconductor optical amplifier （SOA）. In the scheme,only an optical source and a SOA are needed. So this scheme is simple. As the opposite working way is used,the scheme has advantages in improving the ER of the output signal. There is only one wavelength included in the output monocycle single pulse,so no time difference between the upper and down pulses is introduced during the transmission. By using the software of Optisystem7.0, the impacts of the input signal pulse width, the optical power,the wavelength and the SOA injected current on the generated monocyele pulse are numerically simulated and studied. The results show that this scheme has good tolerance to the input singnal pulse width and is insensitive to the wavelength change. In addition, the optimized scope of the source power and the injected current of the SOA are also presented.