基于光注入半导体激光器的超宽带信号产生

发布时间：2018-11-10 17:44

【摘要】：提出一种基于光脉冲注入条件下半导体激光器腔内交叉增益调制(XGM)效应的超宽带(UWB)信号产生方案,通过一个增益开关激光器(ML)、一个半导体激光器(SL)和一个光带通滤波器(OBPF),在平衡探测器(BPD)端口直接检测输出重复频率为2.5GHz的UWB一阶微分(Monocycle)和二阶微分(Doublet)信号,而且通过引入马赫-曾德尔调制器(MZM),还可对产生的UWB信号实现开关键控(OOK)。对所提系统进行了全面的系统仿真分析,并进行了实验验证,实现了上述各种条件的UWB信号产生,并实现了UWB信号的40km光纤传输实验。实验结果表明:该方案获得的UWB信号的频谱与美国联邦通信委员会(FCC)定制的EIRP标准吻合,同时经过调制的UWB信号的波形经40km光纤传输之后基本保持不变。为了证明本文方法产生的UWB信号的重复变化特点,还产生了频率为3.75GHz的UWB信号。
[Abstract]:An ultra-wideband (UWB) (UWB) signal generation scheme based on intracavity cross-gain modulation (XGM) effect of laser diode under optical pulse injection is proposed. A gain switched laser (ML),) is used to generate UWB signal. A semiconductor laser (SL) and an optical bandpass filter (OBPF),) directly detect UWB first-order differential (Monocycle) and second-order differential (Doublet) signals with a repetition rate of 2.5GHz on the (BPD) port of the balanced detector. Moreover, by introducing the Mach Zehnder modulator (MZM), the (OOK). Can be turned on and off to the generated UWB signal. The system is simulated and analyzed, and the experiment is carried out. The UWB signal is generated under the above conditions, and the 40km fiber transmission experiment of UWB signal is realized. The experimental results show that the spectrum of the UWB signal obtained by this scheme is consistent with the EIRP standard customized by the (FCC) of the Federal Communications Commission of the United States, and the waveform of the modulated UWB signal is basically unchanged after being transmitted through the 40km fiber. In order to prove the characteristic of repeated variation of UWB signal produced by this method, UWB signal with frequency of 3.75GHz is also produced.
【作者单位】：解放军理工大学通信工程学院;解放军装甲兵学院;解放军南京炮兵学院;
【基金】：江苏省自然科学基金会(BK2012058,BK20140069)资助项目
【分类号】：TN248;TN929.11

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