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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

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Published on: April 1, 2020

GaAs-based surface-normal optical modulator compared to Si and its wavelength response characterization using a

Ojas P Kulkarni¹, Mohammed N Islam, Fred L Terry

¹Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI 48109, USA. ojaspk@umich.edu

|March 4, 2011

Summary

This study demonstrates a novel Gallium Arsenide (GaAs)-based optical modulator. This device offers superior modulation depth and potential for higher speeds compared to silicon (Si) devices, suitable for advanced networks.

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Area of Science:

Optoelectronics
Materials Science

Background:

Optical modulators are crucial for high-speed communication.
Existing silicon (Si)-based modulators have limitations in modulation depth and speed.
The free-carrier effect offers a potential mechanism for optical modulation.

Purpose of the Study:

To demonstrate a novel Gallium Arsenide (GaAs)-based surface-normal optical modulator.
To evaluate its performance metrics, including modulation depth and speed.
To assess its suitability for wavelength-division multiplexed (WDM) networks.

Main Methods:

Fabrication of a GaAs-based surface-normal optical modulator.
Characterization of modulation depth and wavelength response using a supercontinuum source.
Device performance comparison with existing Si-based modulators.
Simulation of device speed.

Main Results:

Demonstration of a GaAs-based optical modulator utilizing the free-carrier effect.
Achieved ~43% modulation depth, significantly higher than Si-based devices (~24%).
Simulations predict ~1.8 times higher operating speeds for GaAs compared to Si.
Demonstrated potential for colorless operation.

Conclusions:

GaAs-based optical modulators using the free-carrier effect offer significant advantages over Si-based devices.
The demonstrated device is a promising candidate for high-performance WDM networks.
Further development could lead to faster and more efficient optical communication systems.