Ultra-broadband InP-DHBT mixer enables 582 Gb/s IMDD links

Researchers demonstrate high-speed IMDD optical transmission using an ultra-broadband InP-DHBT-based electrical mixer.

• Main result: Achieved net 582-Gb/s probabilistically shaped PAM12 C-band transmission over 11 km dispersion-shifted fibre and 4×526-Gb/s uniform PAM8 O-band transmission over 2 km four-core fibre using a single-carrier 216-GBd IMDD system.
• Technology used: System is based on a 150-GHz bandwidth InP-DHBT electrical mixer combined with a thin-film lithium-niobate modulator; work was presented as a postdeadline paper (Th3B.3) at ECOC2024 and is available via arXiv with a pending DataCite DOI registration.