The deep integration of optical fiber communications and high-capacity high-frequency wireless communications is the core technology base of future The 6th Generation Networks(6G).It holds significant importance in building typical 6G scenar-ios such as"immersive communications,ubiquitous connectivity,and communications Artificial Intelligence(AI)integration".This paper introduces mainstream technologies and their implementation for optimizing the architecture and improving the spectral efficiency of fiber-wireless integrated transmission systems.We summarize some of the progress made by our team in these areas.First of all,facing the large-capacity demand for a new generation of immersive communications,we propose a no-vel architecture for seamless"fiber-wireless-fiber"integrated transmission system with the use of commercial Digital Coherent Optics(DCO).We firstly realize the photonics-assisted 100/200/400 GbE real-time THz wireless transmission,achieving a maximum line rate of 2×240.558 Gbit/s.Secondly,for application scenarios with wide coverage and flexible deployment,Dig-ital Sub Carrier Multiplexing(DSCM)technology was introduced into the optical fiber wireless converged access system.Our team designs and constructs a coherent Passive Optical Networks(PON)that supports up to 32 channel of fixed broadband ac-cess and 32 channel of W-band millimeter-wave wireless access.This coherent PON can reach the rate of 100 Gbit/s and is ca-pable of flexible rate adjustments,facilitating subsequent iterative upgrades.Finally,in response to the demand for communi-cation AI integration,our team proposes a likelihood-aware Vector-Quantization(VQ)Variational Auto Encoder(VAE)based on AI technology for end-to-end optimization of fiber-wireless integrated communication systems.Without the need for tera-hertz power amplifiers,we successfully demonstrate the wireless transmission of Dual-Polarization(DP)terahertz signal at a net rate of 366.4 Gbit/s over 6.5 m 2×2 Multiple Input Multiple Output(MIMO)wireless link and 20 km Standard Single Mode Fiber(SSMF)link.The aforementioned technologies exhibit tremendous potential in typical future 6G scenarios.Be-sides,we briefly introduce our work in these areas,and provide an outlook on beyond 100 Gbit/s fiber-wireless integrated transmission technology from the perspectives of high capacity,long distance,integration and intelligentization.
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