摘要
在小信号增益条件下推导出了高斯光脉冲经过矩形谱宽带光抽运的布里渊慢光系统后输出脉冲时域振幅包络的近似解析表达式,适用于抽运光频谱具有陡峭上升(下降)沿和平坦顶部的情况.定量分析和比较了光纤色散以及受激布里渊散射增益不均衡和增益所致色散效应对延迟信号光脉冲失真的影响.计算结果表明:当信号光脉冲的频谱处于布里渊有效增益谱内时,解析解与数值解符合,布里渊增益所致三阶色散效应是导致延迟信号光脉冲失真的主要物理因素,制约了窄脉冲延迟量的提高.
Assuming a Gaussian-shaped input signal pulse,we deduced the analytical expression of the output-pulse amplitude envelope in the Brillouin slow light system utilizing broadband pump with a rectangular spectrum under small-signal gain approximation.The expression is applicable in case that the pump spectrum has a sharp rising or trailing edge and a flat top.The influence of the fiber dispersion,the stimulated Brilouin scattering（SBS） gain non-uniformity and the SBS-gain-induced dispersion on the pulse distortion has also been quantitatively analyzed.The calculated results show that the analytical solution agrees well with the numerical one if the spectrum of the signal pulse lies in the pump spectrum.SBS-gain-induced third-order dispersion is the main physical factor responsible for the pulse distortion,which also limits the retardation increase of the short pulse in the cascaded Brillouin slow light system.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2010年第7期4694-4700,共7页
Acta Physica Sinica
关键词
慢光
受激布里渊散射
脉冲失真
高斯脉冲
slow light
stimulated Brillouin scattering
pulse distortion
Gaussian pulse
