本文選題：無線光通信　切入點(diǎn)：徑向部分相干陣列光束　出處：《光子學(xué)報(bào)》2016年11期 　論文類型：期刊論文

【摘要】：基于廣義的Huygens-Fresnel原理和非Kolmogorov譜模型,推導(dǎo)了無線光通信系統(tǒng)中徑向分布部分相干高斯-謝爾模型陣列光束在非Kolmogorov大氣湍流中傳輸時(shí)瑞利區(qū)間z_R和湍流距離z_T的解析表達(dá)式,對瑞利區(qū)間和湍流距離隨湍流參量和光束參量的變化情況進(jìn)行了數(shù)值分析.結(jié)果表明:不論是相干還是非相干合成,徑向分布部分相干高斯-謝爾模型陣列光束的z_R和z_T均隨湍流廣義指數(shù)α的增大非單調(diào)變化,當(dāng)α=3.11時(shí),z_R和z_T取最小值,此時(shí)陣列光束擴(kuò)展最大;相干合成比非相干合成的光束擴(kuò)展要小,但其受湍流的影響更大;對于相干合成而言,徑向分布半徑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的影響;不論是相干還是非相干合成,陣列子光束數(shù)目對合成光束的z_R和z_T沒有影響;當(dāng)光束相干參量β足夠小或波長λ足夠大時(shí),大氣湍流對陣列光束z_R的影響可以忽略.
[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 偽. When 偽 = 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.
【作者單位】： 西安理工大學(xué)自動(dòng)化與信息工程學(xué)院;江蘇海虹電子有限公司;
【基金】：國家自然科學(xué)基金(Nos.61377080,60977054)資助~~
【分類號】：O357.5;O43
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本文編號：1643891