We report a 108 Gbit/s fully coherent optical-wireless transmission in the 125 GHz band for 6G mobile fronthaul. Using an injection-locked heterodyne detection scheme, we generated a 125 GHz-IF signal with a single-sideband phase noise of 3.2 degrees, which was sufficiently low for the demodulation of a 64 QAM data signal. By applying a digital pre-equalization scheme, we successfully transmitted an 18 Gbaud 64 QAM signal over a 10 km single-mode fiber and over 70 m wirelessly with a spectral efficiency of 5.71 bit/s/Hz.
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Tomoki Joichi
Arata Watanabe
Keisuke Kasai
Optics Express
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Joichi et al. (Wed,) studied this question.
www.synapsesocial.com/papers/69a760dec6e9836116a2e055 — DOI: https://doi.org/10.1364/oe.579647