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This paper presents a comprehensive experimental analysis of a cost-effective and spectrally efficient approach for sub-terahertz (sub-THz) signal generation and transmission, consisting of a directly modulated laser (DML) combined with carrier-suppressed Mach–Zehnder modulator (CS-MZM) in a radio-over-fiber (RoF) architecture. The use of optical and electrical filtering by means of a fiber Bragg grating (FBG) and an electrical bandpass filter (EBPF), respectively, permits to mitigate undesirable optical and electrical signal components and reduce fiber dispersion effects. For the proof-of-concept demonstration, a standard-compliant 5G new radio 64-QAM OFDM signal at different intermediate frequencies was successfully transmitted over a fiber-wireless system in the W band (75-110 GHz). The system characterization under different hardware configurations was comprehensively analyzed to give insights for the system design under different operation conditions. The results demonstrate improved sideband rejection, minimized intermodulation distortion, and high spectral purity, making this technique a promising solution for future 6G fronthaul deployments.
Botella-Campos et al. (Mon,) studied this question.