CAJ | 학술논문

利用直接电流调制光反馈半导体激光器产生了符合美国联邦通信委员会关于室内无线通信频谱限定的超宽带(UWB)微波信号.基于光反馈半导体激光器速率方程组,数值分析了偏置电流、反馈强度对混沌UWB脉冲信号的影响.研究表明,混沌UWB脉冲频谱的?10 dB带宽分别随着偏置电流的增大和反馈强度的增强而逐渐增加;中心频率分别随着偏置电流的增大和反馈强度的增强而逐渐增大.实验中,产生了中心频率为6.6 GHz,?10 dB带宽为9.6 GHz的混沌UWB信号.进一步,通过调节偏置电流和反馈强度,可实现混沌UWB信号的中心频率和?10 dB带宽的可调谐输出,实验结果和数值分析相符合.此外,实验产生的混沌UWB信号经过34.08 km的光纤传输后,其频谱形状几乎没有发生变化,表明该方法所产生的混沌UWB信号对光纤色散有较大的容忍度.
이용직접전류조제광반궤반도체격광기산생료부합미국련방통신위원회관우실내무선통신빈보한정적초관대(UWB)미파신호.기우광반궤반도체격광기속솔방정조,수치분석료편치전류、반궤강도대혼돈UWB맥충신호적영향.연구표명,혼돈UWB맥충빈보적?10 dB대관분별수착편치전류적증대화반궤강도적증강이축점증가;중심빈솔분별수착편치전류적증대화반궤강도적증강이축점증대.실험중,산생료중심빈솔위6.6 GHz,?10 dB대관위9.6 GHz적혼돈UWB신호.진일보,통과조절편치전류화반궤강도,가실현혼돈UWB신호적중심빈솔화?10 dB대관적가조해수출,실험결과화수치분석상부합.차외,실험산생적혼돈UWB신호경과34.08 km적광섬전수후,기빈보형상궤호몰유발생변화,표명해방법소산생적혼돈UWB신호대광섬색산유교대적용인도.
@@@@The chaotic ultra-wideband (UWB) pulse signals are generated by directly modulating semiconductor laser subjected to optical feedback. We simulate that the?10 dB bandwidth and the central frequency of the RF spectrum of the chaotic UWB signals are influenced by the bias current and feedback strength. The research results demonstrate that the?10 dB bandwidth of the RF spectrum of the UWB signals increases with the increases of the bias current of the semiconductor laser and the feedback, the central frequency also increases with the increases of the bias current and the feedback. In our experiments, chaotic UWB signals with steerable and flatted power spectrum are generated by directly modulating DFB-LD subjected to optical feedback. The power spectrum of UWB signals is fully compliant with the FCC indoor mask, while a large fractional bandwidth of 133%and a central frequency of 6.6 GHz are achieved. The central frequency and?10 dB bandwidth of the chaotic UWB signals are on a large scale tunable by adjusting the bias current and feedback power. In addition, the chaotic UWB signals transmit through a 34.08 km single mode fiber and the power spectrum does not have any discrete spectrum line.