Abstract

Photonic crystal slow light waveguides are demonstrated with a large delay-bandwidth product over 100, picosecond pulse transmission and tunable delay. The nonlinear enhancement based on the slow light pulse is also presented.

Highlights

  • Photonic packet routers are considered to be indispensable at network nodes in future optical ber communication systems

  • Slow light with a markedly low group velocity ug has been extensively studied toward a compact delay line with fast and continuous tunability.1),2) slow light compresses optical energy in space and increases light-matter interaction, resulting in enhanced gain and absorption, phase shift, and nonlinearities

  • Photonic crystal waveguides (PCWs), the main topic of this paper, forms standing waves on the Bragg condition of their periodic structure and slow light occurs due to large rst order dispersion near the Bragg condition.8) Presently, it is straightforward to observe experimentally a group velocity of c/10 { c/100 and a delay of 10 ps order

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Summary

Introduction

Photonic packet routers are considered to be indispensable at network nodes in future optical ber communication systems. Slow light with a markedly low group velocity ug has been extensively studied toward a compact delay line with fast and continuous tunability.1),2) slow light compresses optical energy in space and increases light-matter interaction, resulting in enhanced gain and absorption, phase shift, and nonlinearities. Targets of early studies on slow light were to observe an ultralow group velocity and a long delay. In these years, they have shifted to realization of a wide bandwidth and low higher-order dispersion, which are essential and crucial for practical use of slow light; slow light pulses that carry and store information cannot be generated without them. We describe two solutions of the issues of slow light using photonic crystal waveguides and some recent experimental demonstrations of the tunable delay and nonlinear enhancement

Generation of slow light and issues
Performance of slow light
Photonic crystal waveguides and dispersion control
Dispersion-compensated slow light
Tunable delay
Folded chirping
Low dispersion slow light and nonlinear enhancement
Summary
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