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Simultaneous fast and slow light in microring resonators.

Chris Fietz¹, Gennady Shvets

¹The University of Texas at Austin, Department of Physics, Austin, Texas 78712, USA. flounder@physics.utexas.edu

|December 19, 2007

Summary

Two orthogonal light polarizations in waveguides can exhibit fast and slow light propagation. The specific polarization that is fast or slow depends on the input light and the number of microring resonators.

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Area of Science:

Optics and Photonics
Waveguide Technology
Resonator Physics

Background:

Waveguides coupled to microring resonators are key components in integrated photonics.
Controlling light propagation speed, such as achieving slow light, is crucial for optical signal processing and buffering.

Purpose of the Study:

To investigate the conditions under which orthogonal light polarizations exhibit distinct propagation speeds (fast and slow light) in a waveguide coupled to microring resonators.
To determine the factors influencing which polarization experiences fast or slow light behavior.

Main Methods:

Theoretical analysis of light propagation in a coupled waveguide-microring resonator system.
Modeling the interaction of two orthogonal polarizations with the resonator modes.

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Investigating the dependence of propagation characteristics on input polarization and the number of coupled resonators.

Main Results:

Demonstrated that both fast and slow light propagation can be achieved for two orthogonal polarizations.
Showed that the specific polarization exhibiting fast or slow light is contingent upon the initial input polarization.
Established that the number of microring resonators significantly influences the observed light propagation speeds.

Conclusions:

The propagation characteristics of orthogonal polarizations in overcoupled microring resonators are tunable.
Input polarization and resonator coupling provide control over fast and slow light phenomena.
This research offers insights for designing advanced optical devices with tailored light propagation properties.