基于并联SOA的全光广播式超宽带脉冲形状调制技术

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。

Research on all-optical broadcasting ultra-wideband pulse shape modulation bas ed on multiple semiconductor optical amplifiers

An all-optical broadcasting ultra-wideband (UWB) pulse shape modulation (PS M) technology based on the cross-gain modulation (XGM) in a semiconductor optical amplifier (SOA) has been demonstrated.In this novel scheme,two wideband travelin g wave SOAs are used,and the structure of the parallel SOAs is adopted to genera te the PSM signals.and three kinds of ultra-wideband PSM signals are generated at the smae time.As a consequence,this new scheme has the ability to transmit da ta among multiple users,and can be used as a theoretical basis of multiple accue ss communication.As the opposite working way is used.the scheme has an advantage in improving the extinction ratio (ER) of the output three ultra-wideband PSM signals.By using the software of OptiSystem7.0,the im pacts of the input signal pulse width,the optical power and the wavelength of th e las er on the generated three kinds of ultra-wideband PSM signal are numberically s imulated and studied.In addition,the transmission charac teristics of the generated PSM signal are discussed.The results show that the P S M signal has a good toleration to the pulse width,and the optimized ranges of ot her parameters are presented.