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Related Experiment Video

Updated: Jun 22, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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Published on: November 30, 2012

Slow-light in a vertical-cavity semiconductor optical amplifier.

Nicolas Laurand, Stephane Calvez, Martin D Dawson

|June 12, 2009

Summary

This study explores slow-light effects in Vertical-Cavity Semiconductor Optical Amplifiers (VCSOAs). Researchers demonstrated tunable group delays by adjusting VCSOA gain, validating a predictive model.

Area of Science:

Optoelectronics
Semiconductor Physics
Photonics

Background:

Vertical-Cavity Semiconductor Optical Amplifiers (VCSOAs) are key components in optical communication systems.
Understanding and controlling slow-light effects in VCSOAs is crucial for advanced optical signal processing.
Previous models often simplified the complex interplay of parameters within VCSOAs.

Purpose of the Study:

To investigate the impact of slow-light phenomena on the group delay (GD) and GD-bandwidth product in VCSOAs.
To develop and validate a predictive model for VCSOA performance under slow-light conditions.
To experimentally demonstrate tunable group delays in a practical VCSOA device.

Main Methods:

Utilized a Fabry-Perot model to theoretically predict group delay and GD-bandwidth performance.

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Analyzed the dependence of GD on cavity parameters and the GDxGD-bandwidth product on gain.

Experimentally validated the model using a 1300nm GaInNAs VCSOA operated in reflection.

Investigated signal distortion caused by nonlinear effects.

Main Results:

The group delay (GD) was found to be dependent on all cavity parameters.
The GDxGD-bandwidth product was shown to be solely dependent on the amplifier gain.
Tunable group delays ranging from 25 to 100 ps were experimentally achieved by varying VCSOA gain.
Nonlinear effects leading to signal distortion were experimentally observed and presented.

Conclusions:

The developed Fabry-Perot model accurately predicts slow-light performance in VCSOAs.
VCSOA gain is a critical parameter for tuning group delay and optimizing GD-bandwidth product.
Experimental results confirm the model's validity and demonstrate the potential for tunable slow-light devices.