Site Personnel de Stéphane Balac - Enseignant Chercheur à l'Université de Rennes 1

Softwares


The following softwares and Matlab/Octave toolboxes are available at download. They are distributed under the CeCILL license under French law and abiding by the rules of distribution of free software.


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SPIP : a computer program for the simulation of light-wave propagation in optical fibre

SPIP is a portable command-line driven utility written in C language for Linux and MS-Windows aimed at solving the Generalized Non-Linear Schrõdinger Equation (GNLSE) as well as the  Non-Linear Schrõdinger Equation (NLSE) involved  in optics in the modelling of light-wave propagation in a passive optical fibre.
In the SPIP program is implemented the Interaction Picture method, a new efficient alternative method to the Symmetric Split-Step method together with a dedicated costless adaptive step-size control based on the use of a 4th order embedded Runge-Kutta method.

This software is governed by the CeCILL license under French law and abiding by the rules of distribution of free software. It has been published in Computer Physics Communications in 2015.





Snapshots of the SPIP program results for the propagation of a 10th order Soliton in a SMF-28 fiber.

Download :
SPIP executable and sources archive
SPIP documentation

You can refer to this program as :
S. Balac and A. Fernandez, SPIP: A computer program implementing the Interaction Picture method for simulation of light-wave propagation in optical  fibre, Computer Physics Communications, 2015. (DOI : 10.1016/j.cpc.2015.10.012)

WGMode : a  Matlab Toolbox  dedicated to the study of whispering gallery modes in optical micro-spheres


The WGMode Matlab Toolbox is constituted of various Matlab scripts to study whispering gallery modes in optical micro-spheres. These scripts allow to explore resonance conditions for TE or TM modes, to visualize whispering gallery TE or TM modes in a micro-sphere and to compute the volume of any given mode. Namely, the WGMode Matlab Toolbox contains the following Matlab scripts :

This toolbox is governed by the CeCILL license under French law and abiding by the rules of distribution of free software.


Various representation of the TE mode with indexes l=271, m=271 and wavelength 804.57 nm
 in a micro-sphere with radius 25 μm and optical index 1.453


Download :
WGMode Toolbox as a ZIP archive
WGMode documentation

You can refer to this program as :
S. Balac and P. Féron, Computation of whispering gallery modes volume in spherical optical micro-resonator, Int. J. Mod. Phys. C, 2015.
 


ARAMIS : a Matlab program for the numerical simulation of metallic implant induced artifacts in magnetic resonance imaging

We have developed a Matlab program that simulates both the susceptibility and the eddy current artifacts in the case of a metallic implant with spherical shape (for such geometry, analytical expressions for the induced RF and static magnetic fields are known). These two kinds of artifact add to the MRI image without our knowing of the contribution of each one to the image distortion. Our program enables to hide one of the two artifacts and image the other or image the effects of the two artifacts together. It is then possible to compare for different materials the importance of each source of image distorsion.

This program is governed by the CeCILL license under French law and abiding by the rules of distribution of free software.

Download the ARAMIS program as a ZIP archive.



MRI artifact generated by a ball of Titanium simulated with the ARAMIS program.
  Susceptibility artifact on the left picture, RF artifact on the center picture and the actual artifact on the right combination of both effects.

Details on the mathematical modeling from where the Matlab program originates can be obtained in the following articles :

| UFR de mathématiques | IRMAR | Université de Rennes 1 |