基于偏置调幅波调制的单模激光系统功率谱研究  

Power Spectrum in a Single-Mode Laser with Biased Amplitude Modulation

作　　者：包广清[1] 张继龙[1] 李伟生[2] 丁志强[1] 林麒麟 BAO Guang-qing ZHANG Ji-long LI Wei-sheng DING Zhi-qiang LIN Qi-lin(College of Electrical and Information Engineering, Lanzhou University of Technology, Lanzhou 730050, China Institute of Automation, SDAS, Jinan 250014,China)

机构地区：[1]兰州理工大学电气工程与信息工程学院,兰州730050 [2]山东省科学院自动化研究所,济南250014

出　　处：《光通信研究》2017年第1期1-2,6,共3页Study on Optical Communications

基　　金：国家自然科学基金资助项目(51267011)

摘　　要：为了改进单模激光系统的稳定性,在单模激光损失模型中输入偏置信号的调幅波,用线性化近似方法计算了输出光强的功率谱,得到功率谱与低频调制信号频率、量子噪声实虚部间的关联系数的变化规律。结果表明:当低频调制信号频率增大、量子噪声增大、自饱和系数减小、量子噪声实虚部间的关联较强时,系统的功率越小,单模激光系统的稳定性越好。同时发现,载波信号的振幅对激光系统的功率谱也有很大影响。In order to improve the stability of a single-mode laser system,the power spectrum in single-mode laser loss model is calculated based on the linear approximation method after inputting a biased amplitude modulation signal.The change rules of are obtained when the modulation signal of low frequency and cross-correlation between the real and imaginary part of the quantum noise are varied.The results indicate that when the low frequency of the modulation signal is large,the quantum noise is large,the self-saturation coefficient is small,and the cross-correlation between the real and imaginary part of the quantum noise is stronger,the power of the system is small and the stability of a single-mode laser system is better.Meanwhile,it is found that the amplitude of carrier signal has a significant influence on the power spectrum of the laser system.

关 键 词：激光物理 调幅波 单模激光 功率谱 线性化近似方法 

分 类 号：TN241[电子电信—物理电子学]