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High performace silicon 2x2 optical switch based on a thermo-optically tunable multimode interference coupler and

Álvaro Rosa, Ana Gutiérrez, Antoine Brimont

|February 3, 2016

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Researchers developed a compact silicon optical switch using a tunable multimode interference (MMI) coupler. This design significantly reduces power consumption by 90% and achieves fast switching times.

Area of Science:

Photonics and Optical Engineering
Integrated Optics
Semiconductor Devices

Background:

Multimode interference (MMI) couplers are key components in optical switching.
Traditional MMI couplers face challenges with footprint size and fabrication tolerance.
Thermo-optic tuning offers a method for active control in MMI devices.

Purpose of the Study:

To propose and demonstrate a compact 2x2 silicon optical switch.
To enhance the performance of MMI-based optical switches through thermal tuning.
To reduce power consumption and switching time in silicon optical switches.

Main Methods:

Design and optimization of a thermo-optically tunable MMI structure.
Integration of a silica trench for thermal isolation.

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Engineering of heater geometry and use of two metallization steps for electrode improvement.

Main Results:

A compact MMI switch with a footprint of 0.005 mm(2) was demonstrated.
Silica trench integration minimized loss and crosstalk.
Power consumption reduced by approximately 90% to 24.9 mW.
Switching times as low as 1.19 µs were achieved.

Conclusions:

The proposed thermo-optically tunable MMI silicon switch offers a significant reduction in footprint.
Optimized thermal management and electrode design lead to substantial power savings and fast switching.
This compact and efficient switch is suitable for advanced photonic integrated circuits.