部分相干高斯脉冲在大气湍流中展宽特性的研究

发布时间：2019-02-28 07:55

【摘要】：脉冲展宽问题对无线光通信系统的码间串扰影响很大。根据广义惠更斯-菲涅耳原理和修正冯·卡门谱模型,对部分相干高斯-谢尔模型脉冲(GSMP)光束在大气湍流中水平传输时的脉冲展宽问题进行了详细的数值分析。推导出了部分相干GSMP光束在大气湍流中频域和时域的平均光强表达式及脉冲展宽表达式。结果表明:部分相干GSMP光束的扩展受湍流的影响比完全相干GSMP光束受到的影响要小,束腰半径越小的光束受到湍流的影响越大。在频域中,相同的传输条件下,湍流越强且外尺度越大,GSMP光束的展宽效应越明显;在时域中,随着初始脉宽的增加,接收端的相对脉宽迅速减小,在40fs之内,相对脉宽很明显,大于40fs时,接收端的脉冲宽度与初始脉宽无明显差别。
[Abstract]:The pulse broadening problem has a great influence on the inter-symbol crosstalk in the wireless optical communication system. Based on the generalized Huygens-Fresnel principle and the modified von Carmen spectrum model, the pulse broadening of partially coherent Gao Si-Schell model pulsed (GSMP) beams in atmospheric turbulence is numerically analyzed in detail. The expressions of mean intensity and pulse broadening of partially coherent GSMP beams in atmospheric turbulence in frequency and time domain are derived. The results show that the influence of turbulence on the spread of partially coherent GSMP beams is less than that of fully coherent GSMP beams, and the smaller the waist radius of the beam is, the greater the influence of turbulence is. In the frequency domain, under the same propagation conditions, the stronger the turbulence and the larger the outer scale, the more obvious the broadening effect of the GSMP beam is. In the time domain, the relative pulse width of the receiver decreases rapidly with the increase of the initial pulse width. Within the 40fs, the relative pulse width is very obvious. When the initial pulse width is larger than the 40fs, there is no obvious difference between the receiver pulse width and the initial pulse width.
【作者单位】：西安理工大学自动化与信息工程学院;
【基金】：国家自然科学基金(61377080,60977054)
【分类号】：TN929.1

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