Concept

Group velocity

Related publications (206)

Light transport regimes in slow light photonic crystal waveguides

Romuald Houdré, Hua Zhang, Nicolas Le Thomas, Jana Jágerská, Vasily Zabelin

The dispersive properties of waves are strongly affected by inevitable residual disorder in man-made propagating media, in particular in the slow wave regime. By a direct measurement of the dispersion curve in k space, we show that the nature of the guided ...

2009

Governing the speed of a light signal in optical fibers

Sang Hoon Chin

Dynamic control of the speed of a light signal, based on stimulated Brillouin scattering in optical fibers, was theoretically studied and also experimentally demonstrated as the core object of this thesis. To date, slow light based on stimulated Brillouin ...

EPFL2009

Application of the fastest route algorithm in the interactive simulation of the effect of local ischemia on the ECG

A method is described to determine the effect on the ECG of a reduced propagation velocity within an ischemic zone. The method was designed to change the activation sequence throughout the ventricles interactively, i.e. with a response time in the order of ...

2009

ACOUSTIC RESONNANCE IN CAVITATION FREE AND CAVITATING FLOWS

François Avellan, Sébastien Alligné, Nicolas Ruchonnet

At part load operation of Francis turbine, the swirl in the draft tube leads to flow instability known as vortex breakdown. This flow instability can interact with the rest of the hydraulic circuit through axially propagating plane-waves. Moreover, at low ...

2009

Comparison Between the Behavior of HTS Thin Film Grown on Sapphire and Coated Conductors for Fault Current Limiter Applications

François Roy, Bertrand Dutoit

The major drawback for the commercialization of fault current limiter (FCL) made of YBCO on sapphire is their expensive price. In the recent years, coated conductors (CC) have been extensively developed and, due to their lower prices, have been recently te ...

Institute of Electrical and Electronics Engineers2009

Characterization of pressure wave propagation in biological tissues

Kossi Agbeviade, Jacques Giovanola, Alain Curnier, Mathieu Benoit, Marcel Donnet

A measurement technique using flexible PVDF gages for characterizing the propagation of pressure waves in biological tissues is developed. We demonstrated that experimental measurements, coupled with numerical simulations, represent a promising method to o ...

E D P Sciences, 17 Ave Du Hoggar Parc D Activites Countboeuf Bp 112, F-91944 Cedex A, France2009

Light Transport and Limits of Slow Light in Real Photonic Crystal Structures in the Presence of Residual Disorder

Romuald Houdré, Hua Zhang, Nicolas Le Thomas, Jana Jágerská

We experimentally investigate the effect of residual disorder on the dispersion curve of light near a band edge. A Fourier space imaging technique accurately distinguishes the propagating regime from diffusive transport and evanescent regime in planar phot ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2009

Wideband delays generated in an all-optical tunable delay line, preserving signal wavelength and bandwidth

Luc Thévenaz, Sang Hoon Chin

A novel technique to produce large all-optically controlled tunable delays of 100 ps pulse train in optical fibers is demonstrated. The configuration of the delay line basically consists of two main stages: the wavelength conversion via semiconductor optic ...

Elsevier2009

Slow and Fast Light in Optical Fibers: Review and Perspectives

Luc Thévenaz

Fiber slow light systems are at a turning point moving from a laboratory research to real applications. The possibility to shape the spectral resonance in Brillouin slow light leads to optimized configurations and innovative solutions. ...

Optical Society of America2009

Complete compensation of pulse broadening in an amplifier-based slow light system using a nonlinear regeneration element

Luc Thévenaz, Sang Hoon Chin

We experimentally demonstrate complete compensation of pulse broadening in an amplifier-based slow light system. The configuration of the delay line basically consists of two stages: a conventional Brillouin slow light system and a nonlinear regeneration e ...

2009

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