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a0／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λq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 spec-trum 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 signalB ,the carrier signal frequency with high fre-quencyωand the intensity of quantum noise Q varied. It is found that the C(0)decreases when the carrier signal fre-quency with low frequency Ωbecomes large,ωbecomes smaller,cross-correlationλq 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 frequencyΩ,the carrier signal of high frequencyωand correlation coefficientλq between the real and imaginary part of quantum noise were studied,but there exists some spe-cial phenomena.
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