Transparency (EIT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305 15.7 Coupled Photonic Resonator Structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 309 15.8 Dispersion Limitation of Nonlinear Photonic SL Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315 15.9 Conclusions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 318 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 318

Recent years have seen a great increase in interest in the regime of light propagation with reduced group velocity, commonly referred to as slow light (SL). Startingwith the pioneeringwork performed in the late 1990s [1] a great effort had been directed at both understanding the basic physics of SL phenomena and applying it to various practical tasks-optical communications, signal processing, photonic switching, and many others.