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Silicon microring modulator array controlled all optically.

Liucun Li, Toshihiko Baba

|May 4, 2026

Summary

This study demonstrates optical heater control of silicon microring modulators for radio-over-fiber applications. This innovation simplifies remote radio-over-fiber device operation by eliminating electrical connections.

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Area of Science:

Photonics and optical communications
Integrated optics
Radio-over-fiber (RoF) systems

Background:

Silicon photonics offers a promising platform for radio-over-fiber (RoF) applications.
Current RoF systems often require complex electrical connections for local devices.
Microring modulators are key components for optical signal modulation.

Purpose of the Study:

To demonstrate optical heater control of multiple microring modulators.
To simplify the operation of remote RoF devices by eliminating electrical connections.
To present a novel configuration for RoF systems using integrated RF antennas and optical heaters.

Main Methods:

Utilizing microring modulators driven by integrated RF antennas.
Tuning microring modulator resonance using optical heaters powered by control light.
Sequentially selecting modulators by designing optical heaters and controlling light power.
Modulating input signal light with RF signals applied to selected modulators.

Main Results:

Successful demonstration of optical heater control for four microring modulators.
Achieved sequential selection of modulators through precise control of optical heaters.
Validated the modulation of signal light by RF signals via selected microring modulators.

Conclusions:

Optical heater control provides a viable method for managing microring modulators in RoF systems.
This approach simplifies RoF device operation, especially for remote locations.
The concept is scalable to two-dimensional modulator arrays using wavelength-division multiplexing.

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