A cost efficient and reliable single mode fiber and free space optics based hybrid $32\times 5\text{Gbps}$ ultra dense wavelength division multiplexed-passive optical network architecture employing optical comb and polarization multiplexing is proposed. The proposed architecture is a step forward towards shifting the next generation wireless network traffic over existing passive optical network to achieve the optimum bandwidth, capacity, quality of service and cost efficiency for mobile subscribers. Self-restorable passive optical networks having fiber based feeder and distribution paths are widely researched in various studies in the past. However, to the best of our knowledge, a self-restorable passive optical network architecture employing free space optics based protection path has not been proposed so-far. The effect of varying polarization mode dispersion from $0.02$ to $0.06\text{ps}.{\text{km}}^{-0.5}$ and the refractive index structure parameter of the Gamma-Gamma channel model from $5\times {10}^{-16}$ to $5\times {10}^{-12}{\text{m}}^{-2/3}$ is evaluated. A techno-economic performance analysis of the architecture for downstream is performed by considering both the distribution and protection paths. It has been shown that the receiver sensitivity for a polarization mode dispersion of $0.06\text{ps}.{\text{km}}^{-0.5}$ is around $-22\text{dBm}$ and for strong turbulence is around $-20\text{dBm}$.

具有成本效益且可靠的单模光纤和自由空间光学器件的混合 $32\times 5\text{千兆位}$提出了一种采用光梳和偏振复用的超密集波分复用无源光网络架构。所提出的体系结构是朝着在现有的无源光网络上转移下一代无线网络业务以实现移动用户的最佳带宽，容量，服务质量和成本效率迈出的一步。在过去的各种研究中，广泛研究了具有基于光纤的馈线和分配路径的自恢复无源光网络。然而，据我们所知，到目前为止，尚未提出采用基于自由空间光学器件的保护路径的自恢复无源光学网络体系结构。改变偏振模色散的影响$0.02$ 至 $0.06\text{ps}。{\text{公里}}^{--0.5}$ 和伽马-伽马通道模型的折射率结构参数从 $5\times {10}^{--16}$ 至 $5\times {10}^{--12}{\text{米}}^{--2/3}$被评估。通过考虑分配路径和保护路径，对下游架构进行了技术经济性能分析。已经表明，对于偏振模色散的接收机灵敏度为$0.06\text{ps}。{\text{公里}}^{--0.5}$ 在附近 $--22\text{分贝}$ 周围有强烈的湍流 $--20\text{分贝}$。