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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Dynamically-tuned coupled-resonator delay lines can be nearly dispersion free

Sunil Sandhu, Michelle L. Povinelli, Mehmet Fatih Yanik, Shanhui Fan

Published Feb 9, 2006• 1 citation
Publisher

Abstract

We investigate dispersion effects in dynamically-tuned, coupled-resonator delay lines. Provided that the system is tuned to a zero-bandwidth state, a signal can be delayed indefinitely without dispersion. We present a theoretical analysis of such a light-stopping system and verify the results using numerical simulations of an example system.

DOI
10.1117/12.660190

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We investigate dispersion effects in dynamically-tuned, coupled-resonator delay lines. Provided that the system is tuned to a zero-bandwidth state, a signal can be delayed indefinitely without dispersion. We present a theoretical analysis of such a light-stopping system and verify the results using numerical simulations of an example system.
Dynamic tuning of systems of microresonators coupled to waveguides allows a rich range of physical effects. Periodic resonator arrays can be tuned to stop and store light pulses, theoretically allowing for tunable delay devices in which the delay is limited neither by bandwidth nor by dispersion. For two-resonator systems, adjustable delays can be obtained from tuning a narrow transparency resonance. Similar behavior is also predicted in a quite different physical system, that of a single photon interacting with dynamically-tuned quantum bits.
We theoretically propose a light-stopping process that uses loss and gain dynamical tuning in short coupled-resonator delay lines. The structure is made of four resonators and is optimized to avoid pulse distortion in the passive regime. The loss and gain modulations allow the resonant structure to be isolated from the access waveguide and the pulse to be stored. We demonstrate via numerical simulations the pulse storing process and show that this active delay line also induces nonlinear effects leading to pulse compression. This last property could be useful for pulse dispersion tailoring.