March 3, 2026Open Access

108 Gbit/s, 64 QAM fully-coherent mobile-fronthaul transmission over 10 km SMF and 70 m wirelessly in the 125 GHz band

Key Points

A coherent optical-wireless transmission achieved 108 Gbit/s using 64 QAM over 10 km of single-mode fiber and 70 m wirelessly.
The spectral efficiency recorded was 5.71 bit/s/Hz, indicating effective data transmission rates in advanced communication systems.
Using an injection-locked heterodyne detection method, low phase noise was crucial for successful signal demodulation.
The findings call for enhanced digital pre-equalization techniques to improve performance in next-gen communication systems.

Abstract

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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Authors

Tomoki Joichi

Arata Watanabe

Keisuke Kasai

Journals

Optics Express

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108 Gbit/s, 64 QAM fully-coherent mobile-fronthaul transmission over 10 km SMF and 70 m wirelessly in the 125 GHz band

Key Points

Abstract

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Discussion

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Journals

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