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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。
A UWB (UWB) signal generation scheme based on the cross-gain modulation (XGM) of the semiconductor laser cavity under the condition of light pulse injection is proposed. A gain switching laser (ML), a semiconductor laser (SL) and an optical bandpass Filter (OBPF). UWB first-order monocycle and second-order double-ended output signals with output repetition frequency of 2.5GHz are directly detected at the balanced detector (BPD) port and filtered by introducing a Mach-Zehnder modulator ), But also on the generated UWB signal on-off keying (OOK). The system is analyzed systematically and verified by experiments. The UWB signal is generated under the above conditions and the 40km optical fiber transmission experiment of UWB signal is realized. Experimental results show that the spectrum of the UWB signal obtained by this scheme agrees well with the customized EIRP standard of the Federal Communications Commission (FCC), and the waveform of the modulated UWB signal remains substantially unchanged after transmitting through the 40 km optical fiber. In order to prove the repeated variation of the UWB signal generated by this method, a UWB signal with frequency of 3.75GHz was also generated.