基于注入锁定法布里-珀罗型激光二极管的超宽带信号产生技术

Ultrawideband Signal Generation Based on Injection Locking of Fabry-Perot Laser Diode

提出了一种基于三波长注入法布里-珀罗型激光二极管(FP-LD)产生超宽带(UWB)信号的方案。在FP-LD不同激射模式中注入一路信号光和两路直流探测光,实现多波长变换并得到两路反码输出和一路正码输出;再通过光纤进行色散走离,使不同波长信号之间产生时延,形成UWB脉冲,最后经过光电转换产生UWB信号。对所提出的UWB信号产生方案的原理进行分析,并对UWB信号的波形以及频谱特性进行了实验研究。在此基础上,进行了1.25Gb/s非归零码(NRZ)信号注入FP-LD产生差分编码UWB信号的实验。实验产生的UWB脉冲信号半峰全宽最小为83.3ps,10dB谱宽约为4.6GHz,其频宽比为107%。

A novel all-optical ultrawideband（UWB） signal generation scheme is proposed based on injection locking of Fabry-Perot laser diode（FP-LD）.By injection locking the FP-LD with one wavelength signal light and two continuous probe light,multi-wavelength conversion is realized with two wavelength inverted signals output and one wavelength non-inverted signal output.After propagating through the fiber with a proper dispersion,time delay between different wavelengths output is introduced and the UWB signal pulse is generated.UWB signal is then obtained after the photo-detection.The operational principle of the proposed scheme is analyzed.Experimental investigation is carried out on the waveform and frequency spectrum characteristics of the UWB pulse.Differential UWB signals generation based on injecting 1.25 Gb/s non-veturn-to-zero（NRZ） signals to the FP-LD is then demonstrated.The experimental results show that the minimum full-width at half-maximum（FWHM） of the pulse is 83.3 ps,and the 10 dB spectral width is about 4.6 GHz with the fractional bandwidth of 107%.