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The Performance Assessment of Multi-Input Multi-Output-Based Radio Over a Free Space Optics Link Using Wave-Division Multiplexing for a 6G Regime


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DOI: https://doi.org/10.15866/iree.v18i4.23462

Abstract


The ever-increasing capacity hunger of the population’s access devices is one of the issues that is expected to be discussed in upgrading to the next generation. Optical networks are expected to serve as a backhaul for future Sixth-Generation (6G) networks. Radio over Free Space Optics (RoFSOs) are expected to be deployed to carry high data rates with large bandwidth utilization. On the other hand, Free Space Optics (FSO) links are susceptible to various environmental factors that cause deterioration in their performance. This paper verifies the effectiveness of the proposed Multi-Input-Multi-Output (MIMO)-based FSO using Wave-Division Multiplexing (WDM). The advantages obtained from the possibilities of integrating WDM technology into RoFSO systems to obtain the benefits of both minimizing the attenuation and increasing the capacity are demonstrated. Additionally, a comparison between Single-Input Single-Output (SISO) and MIMO of WDM-RoFSO links is implemented for better performance analysis. The design is proposed and demonstrated using the OptiSystem design software. According to the proposed simulation setup, the great potential of WDM-MIMO communication has been realized as the expanding capacity has been successfully achieved. where in the WDM-SISO-RoFSO configuration, the 4-WDM×20 Gbps setup over SISO achieved remarkable performance at the operating frequency of 60 GHz in the 6G band up to a distance of 2.1 km with a BER less than -9 dB. Conversely, the proposed WDM-MIMO-RoFSO structure facilitated effective transmissions of 4-WDM×20 Gbps and 4-WDM×40 Gbps setups with 80 Gbps and 160 Gbps total transmission for distances spanning up to 2.2 km and 1.8 km, respectively, via 2×2-MIMO. These accomplishments were effectively attained in the 60 GHz – 6G band. Additionally, implementing a link with a 44 MIMO setup extended data transmission up to a maximum range of 2.3 km with higher signal quality and a lower BER.
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Keywords


Radio over Free Space Optics (RoFSO); Multi-Input Multi-Output (MIMO); Mach‒Zehnder Modulator (MZM); Wave Division Multiplexing (WDM); Sixth Generation (6G); OptiSystem.v.19

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