is2csa Photonics


(Sorted by alphabetic order of lecturers)

Numerical simulation of an active mode-locked laser including a fibered ring cavity and a semiconductor optical amplifier

Laboratoire d'Analyse et d'Architecture des Systèmes
(LAAS) CNRS, Université de Toulouse, 31031 Toulouse, France

Keywords : Mode-locked laser, semiconductor optical amplifier (SOA), dispersion compensating fiber (DCF), clock recovery, picosecond pulses, propagation equation, dynamic model.

Abstract : The goal of this lecture is to present the numerical simulation of a specific configuration of an active mode-locked laser dedicated to the generation of optical pulses at a repetition rate of 10 Gb/s and above suitable for telecommunication purposes. The ring cavity of this laser is made with optical fiber acting as a propagating medium. It also includes an optical bandpass filter and a semiconductor optical amplifier (SOA) whose gain is modulated by an external optical signal (DFB laser externally modulated by a Mach-Zehnder modulator). After a brief introduction of the modelocking technique, we will focus on the simulation of each individual component, especially the optical fiber and the semiconductor amplifier. Afterward we will present the iterative technique employed to produce a stabilized pulse train from an initial Gaussian noise. We will end this lecture on the intra cavity group velocity management efficiency to produce unchirped Gausian like pulses.

Whispering Gallery Modes resonators : a short review.

FERON Patrice
Laboratoire FOTON
, CNRS UMR 6082, Lannion, France

Abstract : Whispering gallery modes (WGM) are specific resonances of a wave field inside a given cavity with smooth edges. They correspond to waves circling around the cavity, supported by continuous total internal reflection of the cavity surface, that meet the resonance condition : after one round-trip they return to the same point with the same phase and hence interfere constructively with themselves, forming standing waves. WGMs have attracted much attention due to potential applications in photonics, quantum electrodynamics, telecommunication, etc. During this talk we will give a short review on the topic.
Reference : G. C. Righini, Y. Dumeige, P. Fron, M. Ferrari, G. Nunzi Conti, D. Ristic and S. Soria. Whispering gallery mode microresonators : Fundamentals and applications. Rivista del Nuovo Cimento, 34(7) :435488, 2011

Computer Implementation of the Finite Element Method : the example of MELINA++/ XLIFE++ Library

IRMAR, Université de  Rennes I, CNRS, Campus de Beaulieu, 35042  Rennes, France

Abstract : In this talk we will present various selected aspects of the computer implementation of the Finite Element Method drawn on our own experience in the development of the MELINA++ and XLIFE++ libraries of Finite Elements in C++.

Introduction to Perfectly Matched Layers (PMLs)

IRMAR, Université de  Rennes I, CNRS, Campus de Beaulieu, 35042  Rennes, France

Abstract : In this talk we will give a brief introduction to the theory and practice of perfectly matched layer (PML) absorbing boundaries for the wave equation. A perfectly matched layer (PML) is an artificial absorbing layer commonly used to truncate computational regions in the Finite Element method to simulate problems with open boundaries.