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Integrated silicon elliptical ring modulator with ultra-high bandwidth beyond 110 GHz.

Jian Li, Yuxiang Yin, Yihang Li

|September 16, 2025

Summary

Researchers developed an elliptical silicon ring modulator for energy-efficient optical interconnects. This device achieves a high extinction ratio and over 110 GHz bandwidth, supporting advanced data modulation formats.

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Area of Science:

Photonics and Optical Engineering
Integrated Optics
Semiconductor Devices

Background:

Optical interconnects are crucial for energy-efficient, high-throughput optical input/output (I/O).
Silicon photonic microring modulators are key components for optical I/O due to their size, efficiency, and wavelength-division multiplexing compatibility.
Optimizing high-speed microring modulators is challenging due to trade-offs between bending radius, coupling strength, and cavity loss.

Purpose of the Study:

To demonstrate an elliptical silicon ring modulator with improved bus-ring coupling.
To overcome the limitations of traditional circular microring modulators in achieving high performance.
To enable higher data rates in optical communication systems.

Main Methods:

Fabrication of an elliptical silicon ring modulator.
Characterization of the device's optical and electro-optic performance.
Testing modulation capabilities with high-baud-rate signals.

Main Results:

Achieved a high extinction ratio of 32 dB.
Demonstrated a 3-dB electro-optic bandwidth exceeding 110 GHz.
Successfully supported 112 Gbaud PAM-4 modulation.

Conclusions:

The elliptical silicon ring modulator design enhances bus-ring coupling, improving performance.
This device offers a promising solution for next-generation optical interconnects.
The demonstrated performance paves the way for higher-speed and more efficient optical communication.