非Kolmogorov大气湍流对径向部分相干阵列光束瑞利区间和湍流距离的影响

发布时间：2018-03-21 12:39

  本文选题：无线光通信　切入点：径向部分相干阵列光束　出处：《光子学报》2016年11期 　论文类型：期刊论文

【摘要】：基于广义的Huygens-Fresnel原理和非Kolmogorov谱模型,推导了无线光通信系统中径向分布部分相干高斯-谢尔模型阵列光束在非Kolmogorov大气湍流中传输时瑞利区间z_R和湍流距离z_T的解析表达式,对瑞利区间和湍流距离随湍流参量和光束参量的变化情况进行了数值分析.结果表明:不论是相干还是非相干合成,径向分布部分相干高斯-谢尔模型阵列光束的z_R和z_T均随湍流广义指数α的增大非单调变化,当α=3.11时,z_R和z_T取最小值,此时阵列光束扩展最大;相干合成比非相干合成的光束扩展要小,但其受湍流的影响更大;对于相干合成而言,径向分布半径r0越大,合成光束的z_R和z_T就越大,而非相干合成的z_R和z_T不受r0的影响;不论是相干还是非相干合成,阵列子光束数目对合成光束的z_R和z_T没有影响;当光束相干参量β足够小或波长λ足够大时,大气湍流对阵列光束z_R的影响可以忽略.
[Abstract]:Based on the generalized Huygens-Fresnel principle and the non-#en1# spectral model, the analytical expressions of the Rayleigh region ZAR and the turbulence distance ZSP for radial distributed partially coherent Gaussian Schell model array beams propagating in non-#en2# atmospheric turbulence in wireless optical communication systems are derived. The variation of Rayleigh region and turbulence distance with turbulence parameters and beam parameters is numerically analyzed. The radial distribution of partially coherent Gaussian Schell model array beams Zs and Zs T are not monotone with the increase of the turbulent generalized exponent 伪. When 伪 = 3.11, the maximum expansion of the array beams is obtained when the values of the Z _ S _ R and ZSP _ T are taken as the minimum values. For coherent combination, the larger the radial distribution radius r _ 0, the larger the ZR and ZS _ T of the synthesized beam, but the more the zR and z _ s _ T of the non-coherent combination are not affected by r _ 0, the smaller the beam propagation of coherent combination is, the greater the radial distribution radius r _ 0 is. No matter coherent or incoherent combination, the number of array subbeams has no effect on the Z _ S _ R and z _ s _ T of the synthesized beams. When the beam coherence parameter 尾 is small enough or the wavelength 位 is large enough, the effect of atmospheric turbulence on the array beam Zs can be neglected.
【作者单位】： 西安理工大学自动化与信息工程学院;江苏海虹电子有限公司;
【基金】：国家自然科学基金(Nos.61377080,60977054)资助~~
【分类号】：O357.5;O43
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