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Related Experiment Video

Updated: Aug 22, 2025

Fabrication and Testing of Photonic Thermometers

Fabrication and Testing of Photonic Thermometers

Published on: October 24, 2018

All-optic control using a photo-thermal heater in Si photonics.

Liucun Li, Takemasa Tamanuki, Toshihiko Baba

|November 11, 2022

Summary

We developed an all-optic control for silicon photonics using a photo-thermal heater. This method offers efficient light-based control for photonic devices, surpassing electrical heating performance.

Area of Science:

Photonics
Materials Science
Optical Engineering

Background:

Silicon photonics enables integrated optical circuits.
All-optic control methods are sought for efficient device operation.
Photo-thermal effects offer a pathway for non-electrical control.

Purpose of the Study:

To demonstrate a simple all-optic control for silicon photonics.
To utilize photo-thermal heating for phase tuning of signal light.
To compare the efficiency of all-optic control with electrical heating.

Main Methods:

Designed and fabricated Mach-Zehnder and microring devices.
Utilized a heavily doped waveguide for control light absorption.
Employed thermal diffusion for phase tuning in an adjacent signal waveguide.

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Last Updated: Aug 22, 2025

Fabrication and Testing of Photonic Thermometers

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Measured control power requirements and heating efficiency.

Main Results:

Achieved all-optic control with low power consumption (17 mW for π-phase shift, 4 mW for 6 dB extinction).
Demonstrated efficient phase tuning via thermal diffusion.
Confirmed superior heating efficiency compared to electrical heaters.

Conclusions:

The proposed all-optic photo-thermal heater is a viable and efficient control method for silicon photonics.
This approach offers a promising alternative to electrical control for integrated photonic devices.
The demonstrated devices show potential for various silicon photonic applications requiring optical modulation.