摘要
利用外部光注入混沌激光器产生了完全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.基于外部光注入光反馈半导体激光器的速率方程组,理论研究了外部及内部参量对半导体激光器输出混沌UWB脉冲信号的影响.研究表明,UWB信号的-10dB带宽随着光注入强度、注入失谐量以及线宽增强因子的增大而增大,随着激光器偏置电流的增大而减小.同时,UWB信号的中心频率在5—8GHz范围内变化.在实验中,通过设定其他参量和调节光注入强度,得到中心频率及带宽可调谐的混沌UWB微波信号,传输速率达到500Mbit/s.实验结果与理论分析相符合.
The ideal ultra-wideband （UWB） microwave pulses that fully comply with the indoor spectrum mask governed by Federal Communications Commission（FCC Indoor Mask）are generated by using continuous-wave optical injection to a chaotic laser diode.We firstly simulate and demonstrate the photonic generation of the chaotic UWB signal according to the rate equations of laser diode with optical feedback and injection.The simulations display that the-10 dB bandwidth of UWB signal increases with the increases of optical injection strength,frequency detuning,linewidth enhancement factor and with the decrease of bias current of the slave laser,and the UWB signal central frequency changes in a range from 5 to 8 GHz.We further experimentally obtain tunable chaotic UWB microwave signals with a rate up to 500 Mbit/s by tuning optical injection strength when the other parameters are fixed.The experimental results are in accordance with the theoretical analyses.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第12期277-286,共10页
Acta Physica Sinica
基金
国家自然科学基金(批准号:60927007
60777041
61108027)
国家重点基础研究发展计划(批准号:2010CB327800)资助的课题~~
关键词
半导体激光器
混沌激光
光生微波技术
超宽带信号
laser diode
chaotic laser
technology of photonic microwave
ultra-wideband signal
