基于非模式选择光子灯相干接收的自由空间光通信
Free-Space Optical Communication Using Non-mode-Selective Photonic Lantern Based Coherent Receiver
摘要：
研究了一种基于非模式选择光子灯笼相干接收的自由空间光通信系统。在模拟光子分布的基础上，定量地描述了单模光纤端部光致发光的功率分布为单形上的截断高斯分布。分析了采用PL接收机的通信系统在选择合并、等增益合并和最大比合并等不同合并技术下的信噪比。给出了光致发光（PL）接收机、单模光纤接收机和多模光纤接收机在Gamma-Gamma大气湍流信道下的误比特率的积分解、级数下界解和渐近解。我们证明了PL的功率分布没有影响基于PL的接收机的SNR和BER性能时，MRC使用;它只有有限的影响时，使用EGC。然而，当使用SC时，PL的功率分布会极大地影响BER性能。此外，数值研究了在不同非理想器件参数下，采用EGC的PL基接收机相对于单模光纤接收机和多模光纤接收机的信噪比增益，进一步给出了该通信系统的适用范围。
英文摘要：
A free-space optical communication system using non-mode-selective photonic lantern (PL) based coherent receiver is studied. Based on the simulation of photon distribution, the power distribution at the single-mode fiber end of the PL is quantitatively described as a truncated Gaussian distribution over a simplex. The signal-to-noise ratios (SNRs) for the communication system using PL based receiver are analyzed using different combining techniques, including selection combining (SC), equal-gain combining (EGC), and maximal-ratio combining (MRC). The integral solution, series lower bound solution and asymptotic solution are presented for bit-error rate (BER) of PL based receiver, single-mode fiber receiver and multimode fiber receiver over the Gamma-Gamma atmosphere turbulence channels. We demonstrate that the power distribution of the PL has no effect on the SNR and BER performance of the PL based receiver when MRC is used; and it only has limited influence when EGC is used. However, the power distribution of the PL can greatly affect the BER performance when SC is used. Besides, the SNR gains of the PL based receiver using EGC over single-mode fiber receiver and multimode fiber receiver are numerically studied under different imperfect device parameters; and the scope of application of the communication system is further provided.
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