In this paper, we propose a full duplex architecture based on a hybrid link composed of free space optics (FSO) and multimode plastic optical fiber (MMPOF) for short-range wireless access networks. The proposed architecture employs mode group division multiplexing (MGDM) and wavelength reuse techniques to transmit data between central unit (CU) and radio access units (RAUs). An optical frequency comb source to generate multiple optical sidebands is realized using a single laser source to provide 60 GHz millimeter-wave (mm-wave) signals at each RAU by simultaneously transmitting PAM-4 signal on linearly polarized (LP) modes of each optical sideband. Data rate of 2\(\times\)12 Gbps at mm-wave frequency of 60 GHz is achieved for both downlink (DL) and uplink (UL) transmissions. The transmission of 2\(\times\)12 Gbps PAM-4 signal over hybrid FSO-MMPOF link is investigated at different values of refractive index structure parameter (\(C_n^2\)) by employing log-normal (LN) FSO channel model to support three RAUs in a ring topology. The acceptable receiver sensitivities below −5 and −0.6 dBm for DL and UL transmissions are achieved, respectively. The proposed hybrid architecture can be a potential candidate for future communication networks.

在本文中，我们提出了一种基于混合链路的全双工架构，该混合链路由自由空间光学（FSO）和多模塑料光纤（MMPOF）组成，用于短距离无线访问网络。所提出的体系结构采用模式组分割多路复用（MGDM）和波长重用技术在中央单元（CU）和无线电访问单元（RAU）之间传输数据。通过使用单个激光源，通过同时在每个光学单元的线性偏振（LP）模式下传输PAM-4信号，在单个RAU上提供60 GHz毫米波（mm-wave）信号，从而实现了产生多个光学边带的光学频率梳源。边带。对于下行链路（DL）和上行链路（UL）传输，在60 GHz毫米波频率下都达到2 \（\ times \） 12 Gbps的数据速率。传输2通过使用对数正态（LN）FSO信道模型来支持在不同的折射率结构参数值（\（C_n ^ 2 \））上研究混合FSO-MMPOF链路上的\（\ times \） 12 Gbps PAM-4信号环形拓扑中的三个RAU。对于DL和UL传输，分别获得低于-5和-0.6 dBm的可接受的接收器灵敏度。所提出的混合架构可以是未来通信网络的潜在候选者。