Publications related to Variable delay using stationary and localized Brillouin dynamic gratings

Mesure de traces de gaz à l'aide de lasers à semi-conducteur

Infrared spectroscopy using semiconductor lasers is a promising technique for trace gas detection. It allows a continuous and real time monitoring of several species, with a high sensitivity and a good selectivity. Among all the possible methods two are pa ...

EPFL2002

Method for sending information signals over a communication channel, and corresponding encoder

Bixio Rimoldi

Pulse amplitude modulation scheme with the same spectral efficiency as QAM, that is twice the spectral efficiency of conventional PAM schemes, comprising the steps of: (1) forming a train of pulses q(t -kT/2) = p(t - k T/2)cos2 pi fo(t- k T/2), wherein p(t ...

2001

Some properties of variable length packet shapers

Jean-Yves Le Boudec

The min-plus theory of greedy shapers has been developed after Cruz`s results on the calculus of network delays. An example of greedy shaper is the buffered leaky bucket controller. The theory of greedy shapers establishes a number of properties ...

2001

Homonuclear dipolar decoupling in solid-state NMR using continuous phase modulation

David Lyndon Emsley

We present a theoretical framework for the use of continuously phase modulated radio-frequency pulses for homonuclear decoupling in solid-state NMR. Within this framework, we have derived new families of decoupling sequences using numerical optimization. O ...

ELSEVIER SCIENCE BV2000

Strong coherent gain from semiconductor microcavities in the regime of excitonic saturation

Benoît Marie Joseph Deveaud, Ursula Oesterle, Marc-André Dupertuis, Cristiano Ciuti, Michele Saba

We present femtosecond gain measurements in microcavity-embedded quantum wells. When the excitonic transition is saturated by an intense pump field, the spectrum measured with a weak probe pulse is strongly modulated by pump-probe wave mixing processes. A ...

1999

A Note on the Fairness of TCP Vegas

Jean-Yves Le Boudec, Catherine Boutremans

We study the fairness of TCP Vegas. The latter is an alternative to the commonly used TCP Reno, and uses measures of the round trip time as feedback on congestion. We consider two cases that depend on the value of the two parameters

\alpha

and

\beta

co ...

1999

Investigation of two-layered turbid media with time-resolved reflectance

Hubert van den Bergh, Georges Wagnières

Light propagation in 2-layered turbid media that have an infinitely thick 2nd layer is studied with time-resolved reflectance. The authors used a soln. of the diffusion equation for this geometry to show that it is possible to derive the absorption and the ...

1998

Frequency-modulated cross-polarization for fast magic angle spinning NMR at high fields: relaxing the Hartmann-Hahn condition

Geoffrey Bodenhausen

Two novel schemes are described for cross polarization in NMR that make it possible to achieve an efficient transfer of polarization from abundant I spins to dil. S spins under high-speed magic angle spinning spectroscopy, which is useful for systems with ...

1997

Phase Modulation in Ingaasp Barrier, Reservoir, and Quantum-Well Electron-Transfer Structures, Grown by Chemical Beam Epitaxy

Jean-François Carlin, Alok Rudra, Benjamin Dwir, Franz-Karl Reinhart, Marc-André Dupertuis

We have measured phase modulation in the first chemical beam epitaxy grown InGaAsP/InP barrier, reservoir, and quantum well electron transfer structures. We obtain a negative refractive index change, DELTAn, similar to that found in the InGaAs/InAlAs syste ...

1994

Improved schemes for refocusing with frequency-modulated chirp pulses

Geoffrey Bodenhausen

The authors show that the accuracy of the NMR refocusing can be improved considerably by smoothing the RF amplitude and by optimizing the sweep rates. The suggested improvements are summarized graphically, and the resulting profiles are shown. Illustrative ...

1993

Variable delay using stationary and localized Brillouin dynamic gratings

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Mesure de traces de gaz à l'aide de lasers à semi-conducteur

Method for sending information signals over a communication channel, and corresponding encoder

Some properties of variable length packet shapers

Homonuclear dipolar decoupling in solid-state NMR using continuous phase modulation

Strong coherent gain from semiconductor microcavities in the regime of excitonic saturation

A Note on the Fairness of TCP Vegas

Investigation of two-layered turbid media with time-resolved reflectance

Frequency-modulated cross-polarization for fast magic angle spinning NMR at high fields: relaxing the Hartmann-Hahn condition

Phase Modulation in Ingaasp Barrier, Reservoir, and Quantum-Well Electron-Transfer Structures, Grown by Chemical Beam Epitaxy

Improved schemes for refocusing with frequency-modulated chirp pulses

Mesure de traces de gaz à l'aide de lasers à semi-conducteur

Method for sending information signals over a communication channel, and corresponding encoder

A Note on the Fairness of TCP Vegas

Homonuclear dipolar decoupling in solid-state NMR using continuous phase modulation

Phase Modulation in Ingaasp Barrier, Reservoir, and Quantum-Well Electron-Transfer Structures, Grown by Chemical Beam Epitaxy

Investigation of two-layered turbid media with time-resolved reflectance

Some properties of variable length packet shapers

Strong coherent gain from semiconductor microcavities in the regime of excitonic saturation

Frequency-modulated cross-polarization for fast magic angle spinning NMR at high fields: relaxing the Hartmann-Hahn condition

Improved schemes for refocusing with frequency-modulated chirp pulses