A 100 Gb s⁻¹ quantum-confined Stark effect modulator monolithically integrated with silicon nitride on Si

Abstract

The exponential growth of data-intensive artificial intelligence necessitates ultra-fast and energy efficient transceivers in data centres. Quantum-confined Stark effect (QCSE) modulators offer promising solutions, combining high-speed modulation with minimal footprint and superior energy efficiency. Here, we demonstrate a monolithically integrated O-band Ge/SiGe QCSE modulator operating at 100 Gb s⁻¹, seamlessly integrated with silicon nitride (SiN) waveguides on both silicon and silicon-on-insulator substrates. Our modulator achieves <1 dB coupling loss, <63 fJ bit⁻¹ energy consumption, and >5 dB static extinction ratio, while maintaining performance across a 20–80 °C temperature range. Leveraging CMOS-compatible fabrication processes, we incorporate multiple quantum-well stacks grown at wafer scale on silicon, enabling large-scale production. The modulator’s substrate-agnostic integration with back-end of line grown SiN layers, presents a scalable approach for cost-effective co-integration of electronic and photonic components. This work advances high-speed, energy-efficient optical modulators and paves the way for next-generation photonic integrated circuits in data centre interconnects.

More information

Identifiers

ORCID for Ilias Skandalos: orcid.org/0000-0002-9021-1420

ORCID for Lorenzo Mastronardi: orcid.org/0000-0003-1489-2778

ORCID for Frederic Y. Gardes: orcid.org/0000-0003-1400-3272

Catalogue record

Export record

Altmetrics