摘要
为得到量子级联激光器特有的光噪声特性,通过在速率方程中引入Langevin噪声源以及自发辐射因子的方法,在单模与线性增益的情况下讨论了自发辐射因子及与偏置电流等参数与光噪声的强度及带宽等特性之间的关系,计算结果表明,增大自发辐射因子能降低光噪声的强度,增宽光噪声的3-dB截止频率,进一步的研究也表明,自发辐射因子对光噪声的影响与激光器的偏置电流有密切关系,这种影响在偏置电流较小时比较明显,但当偏置电流很大时自发辐射因子对光噪声的影响将变得很弱。
The noise properties of quantum cascade laser were investigated by using rate equations, which include the Langevin noise sources and the spontaneous emission factor, to make simulation calculation. The calculated results show that the intensity of noise and the 3dB cut-off frequency width simultaneously decrease, while increasing the spontaneous emission factor. The further research denotes that the spontaneous emission factor takes an obvious effect on the noise properties as the bias current is low, and this effect will be weakened by increasing the bias current.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2009年第3期389-393,共5页
Chinese Journal of Luminescence
基金
国家自然科学基金(50602018)
广州市LED工业化研究基地项目(2004U13D0021)
肇庆学院自然科学基金(0629)资助项目
