单模激光系统的光强相对涨落和功率谱  

Intensity fluctuation and power spectrum in a single-mode laser

作　　者：叶庆[1] 张继龙[2] 

机构地区：[1]武汉纺织大学电子与电气工程学院 [2]兰州理工大学电气工程与信息工程学院

出　　处：《激光与红外》2016年第5期565-569,共5页Laser & Infrared

基　　金：武汉纺织大学大学生创新创业训练计划项目支持(No.105/151053008)资助

摘　　要：用线性化近似方法计算了单模激光损失模型在输入偏置调幅波信号后的稳态平均光强相对涨落C(0)和输出功率S(ω),得到稳态平均光强相对涨落C(0)与载波信号振幅B、高频载波信号频率ω以及量子噪声强度Q的变化规律,发现在低频调制信号频率增大、高频载波信号频率减小、量子噪声实虚部关联越强和远离阈值时,激光系统的统计涨落较小。通过对系统功率谱S(ω)与a_0/A、低频调制信号频率Ω、高频载波信号频率ω以及量子噪声实虚部间的关联系数λ_q的研究,也发现了一些特殊的现象。By using the linear approximation method,the normalized mean intensity fluctuation C（ 0） and power spectrum S（ ω） in single-mode laser loss model were calculated after inputting a biased amplitude modulation signal.The change rules of C（ 0） were obtained when the amplitude of carrier signal B,the carrier signal frequency with high frequency ω and the intensity of quantum noise Q varied.It is found that the C（ 0） decreases when the carrier signal frequency with low frequency Ω becomes large,ω becomes smaller,cross-correlation λ_q between the real and imaginary part of the quantum noise becomes stronger or B is away from the threshold.The change rules of the power spectrum S（ ω） with the parametera0/ A,the modulation signal of low frequency Ω,the carrier signal of high frequency ω and correlation coefficient λqbetween the real and imaginary part of quantum noise were studied,but there exists some special phenomena.

关 键 词：单模激光 调幅波 平均光强相对涨落 功率谱 

分 类 号：TN241[电子电信—物理电子学]