基于SOA和EAM的全光超宽带脉冲波形调制  

Research of all-optical ultra-wideband pulse shape modulation based on semiconductor optical amplifier and electro-absorption modulator

作　　者：李培丽[1] 薛菲[1] 黄世杰[1] 郑加金[1] 梁伟康[1] 王莉莉[1] 郭海莉[1] 

机构地区：[1]南京邮电大学光电工程学院,江苏南京210003

出　　处：《光电子．激光》2014年第2期252-258,共7页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61275067);江苏省自然科学基金(BK2012830)资助项目

摘　　要：提出了一种基于半导体光放大器(SOA)和电吸收调制器(EAM)实现超宽带(UWB)脉冲波形调制(PSM)的方案,利用SOA的交叉增益调制(XGM)和增益饱和效应产生高斯单边带(monocycle)信号,利用EAM的交叉吸收调制(XAM)效应控制泵浦光与monocycle信号的叠加,进而实现UWB PSM。与其它方案相比,本文方案具有结构简单、易于控制和色散管理相对简单的优势。利用OptiSystem7.0软件进行了仿真研究,分析了输入信号功率、调制速率和光源波长对UWB PSM信号的影响,研究了UWB PSM信号在光纤中的传输特性。结果表明,本文方案对输入信号波长不敏感。给出了输入信号功率和调制速率的优化范围。An all-optical ultra-wideband pulse shape modulation （PSM） technology based on semiconductor optical amplifier （SOA） and electro-absorption modulator （EAM） is demonstrated. In this novel scheme,the monocycle signal is generated based on the cross-gain modulation （XGM） and the gain saturation effect in a semiconductor optical amplifier.In order to imp lement pulse shape modulation,an electro-absorption modulator is employed to control the superimp osition of the pump signal and the monocycle signal.Compared with other schemes,the configuration of this new scheme is simple.Due to only one wavelength is included in the output ultra-wideband PSM signal,the dispersion management is not complicated.By using the software of OptiSystem7.0,the impacts of the input optical power,the modulation rate and the wavelength of the optical source on the generated ultra-wideband PSM signal are numerically simul ated and studied. Besides,the transmission characteristics of the output ultra-wideband PSM signa l in single mode fiber are also discussed.The results show that the generated PSM signal has a good tolera tion to the wavelength change.In addition,the optimized scope of input optical power ranges from -7d Bm to 0dBm,and the optimized scope of modulation rate ranges from 16GHz to 32GHz.

关 键 词：超宽带(UWB) 脉冲波形调制(PSM) 半导体光放大器(SOA) 电吸收调制器(EAM) 交叉增益调制(XGM) 

分 类 号：TN911.74[电子电信—通信与信息系统]