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基于半导体光放大器(SOA)中交叉增益调制(XGM)效应,采用SOA的并联结构,提出了一种全光产生广播式超宽带(UWB)脉冲形状调制(PSM)信号的方案。该方案同时产生三路超宽带PSM信号,具有多用户传输数据的能力,可为多址通信作理论基础;采用相向的工作方式可以改善输出信号的消光比。利用OptiSystem7.0软件对方案进行仿真,分析了输入信号脉冲宽度、输入光功率和波长对产生的超宽带PSM信号的影响,对信号的传输特性进行了研究。结果表明,本文方案对输入信号脉冲宽度和输入光波长具有良好的容忍度,并且给出了输入光功率的优化范围。
Based on the cross-gain modulation (XGM) effect in semiconductor optical amplifier (SOA), an all-optical (UWB) pulse shape modulation (PSM) signal scheme is proposed based on the parallel structure of SOA. The scheme simultaneously generates three-channel ultra-wideband PSM signals and has the capability of multi-user transmission of data, which can be used as a theoretical basis for multiple-access communication. Opposite working modes can improve the extinction ratio of the output signals. The OptiSystem7.0 software is used to simulate the scheme. The influence of the input signal pulse width, input optical power and wavelength on the generated ultra-wideband PSM signal is analyzed and the signal transmission characteristics are studied. The results show that this scheme has a good tolerance to the input signal pulse width and input light wavelength, and gives the optimal range of input optical power.