This article discusses the basic system architecture for THz wireless links with bandwidths of more than 50 GHz into optical networks. New design principles and breakthrough technologies are required in order to demonstrate terabit- per-second data rates at near zero latency using the proposed system concept. Specifically, we present the concept of designing the baseband signal processing for both the optical and wireless links and using an E2E error correction approach for the combined link. We provide two possible electro-optical baseband interface architectures, namely transparent optical-link and digital- link architectures, which are currently under investigation. THz wireless link requirements are given as well as the main principles and research directions for the development of a new generation of transceiver front-ends that will be capable of operating at ultra-high spectral efficiency by employing higher-order modulation schemes. Moreover, we discuss the need for developing a novel THz network information theory framework, which will take into account the channel characteristics and the nature of interference in the THz band. Finally, we highlight the role of PBF, which is required in order to overcome the propagation losses, as well as the physical layer and medium access control challenges.
Boulogeorgos Alexandros-Apostolos A., Alexiou Angeliki, Merkle Thomas, Schubert Colja, Elschner Robert, Katsiotis Alexandros, Stavrianos Panagiotis, Kritharidis Dimitrios, Chartsias Panteleimon-Konstantinos, Kokkoniemi Joonas, Juntti Markku, Lehtomäki Janne, Teixeira Antonio, Rodrigues Francisco
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5G mobile communication, Baseband, baseband signal processing, digital-link architectures, Heterogeneous networks, higher-order modulation schemes, Optical fiber communication, Optical fiber networks, optical links, optical modulation, Optical polarization, optical transceivers, quality of experience, THz band, THz wireless links, transparent optical-link, Wireless communication, wireless link requirements
A. A. Boulogeorgos et al., “Terahertz Technologies to Deliver Optical Network Quality of Experience in Wireless Systems Beyond 5G,” in IEEE Communications Magazine, vol. 56, no. 6, pp. 144-151, June 2018. doi: 10.1109/MCOM.2018.1700890
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