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IEEE Journal of Quantum Electronics

Dynamic Light Storage in Slow Light Waveguides

Michel Castellanos Muñoz, Adarsha Kanchana, Alexander Yu. Petrov, Manfred Eich

Published Apr 11, 2012• 5 citations
Publisher

Abstract

An approach to store light dynamically in slow light waveguides is proposed. First, design guidelines are developed for waveguides that allow dynamic group velocity control. Then an example of a silicon photonic crystal waveguide is presented where group velocity can be drastically reduced by applying a refractive index change of${-}{5.5}\times 10^{-2}$to a specific part of the waveguide. Performing the index change while a light pulse is confined to the waveguide, we show by numerical simulations a tunable storage time of more than 70 ps for a pulse of 60 GHz bandwidth. We argue that the magnitude of the required change of the refractive index can be reduced by mode optimization.

DOI
10.1109/jqe.2012.2192913

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Slow light with a markedly low group velocity is a promising solution for optical buffering and advanced time-domain optical signal processing. It is also anticipated to enhance linear and nonlinear effects and so miniaturize functional photonic devices because slow light compresses optical energy in space. Photonic crystal waveguide devices generate on-chip slow light at room temperature with a wide bandwidth and low dispersion suitable for short pulse transmission. This paper first explains the delay-bandwidth product, fractional delay, and tunability as crucial criteria for buffering capacity of slow light devices. Then the paper describes experimental observations of slow light pulse, exhibiting their record high values. It also demonstrates the nonlinear enhancement based on slow light pulse transmission.
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Slow light with a markedly low group velocity is a promising solution for optical buering and advanced time-domain optical signal processing.It is also anticipated to enhance linear and nonlinear eects and so miniaturize functional photonic devices because slow light compresses optical energy in space.Photonic crystal waveguide devices generate on-chip slow light at room temperature with a wide bandwidth and low dispersion suitable for short pulse transmission.This paper rst explains the delay-bandwidth product, fractional delay, and tunability as crucial criteria for buering capacity of slow light devices.Then the paper describes experimental observations of slow light pulse, exhibiting their record high values.It also demonstrates the nonlinear enhancement based on slow light pulse transmission.