Christian Boisrobert
University of Nantes
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Publication
Featured researches published by Christian Boisrobert.
Applied Physics Letters | 2003
Xavier Chapeleau; Dominique Leduc; Cyril Lupi; Roger Le Ny; Marc Douay; P. Niay; Christian Boisrobert
We apply a combination of optical low coherence reflectometry and a layer-peeling method to the synthesis of a fiber grating. The index modulation amplitude we obtain is compared with a Krug measurement result and the dc refractive index is derived from the phase measurement.
Journal of Optics | 2006
Xavier Chapeleau; Pascal Casari; Dominique Leduc; Y. Scudeller; Cyril Lupi; R. Le Ny; Christian Boisrobert
In this paper, a powerful method for measuring non-uniform strain is reviewed and extended to the measurement of temperature gradients inside an epoxy part. The sensor is an embedded fibre Bragg grating and the method is based on the measurements of the grating phase obtained by combining optical low coherence interferometry and an inverse scattering algorithm. This method has a great potential and for the first time experimental results obtained for both strain distribution and temperature gradient are presented. By applying a tensile test, strain distribution measurements are first compared with finite element simulations to validate previous published results. Second, original temperature gradient measurements in a solid body are shown. The results are in good accordance with reference measurements achieved with thermocouples incorporated into the body.
Applied Optics | 2006
Xavier Chapeleau; Dominique Leduc; Cyril Lupi; Francisco López-Gejo; Marc Douay; Roger Le Ny; Christian Boisrobert
The technique presented here allows us to obtain an accurate determination of the refractive index modulation amplitude, the mean effective index, and the chirp of fiber-Bragg gratings. A layer-peeling algorithm is used to extract this information from low-coherence interferometry measurements. Finally, we present a systematic study over 10 uniform and chirped gratings to proof the reliability and accuracy of this technique.
Journal of Optics | 2003
Dominique Leduc; Xavier Chapeleau; Cyril Lupi; Roger Le Ny; Christian Boisrobert
In this paper, we present more results obtained on fibre Bragg gratings submitted to Round Robin tests and compare them with those obtained at NIST. We confirm that the reflectance and the relative group delay can be accurately measured with optical low-coherence interferometry. Then, complete characterization of the reflectance and group delay of a free-space optics multiplexer/demultiplexer is performed. We show the similarity of the response of the different channels.
Journal of Applied Physics | 2008
Thomas Schneider; Dominique Leduc; Cyril Lupi; Julien Cardin; Hartmut Gundel; Christian Boisrobert
We consider three layer optical waveguides and present a method to measure simultaneously the refractive index and the thickness of each layer with m-lines spectroscopy. We establish the three layer waveguide modal dispersion equations and describe a numerical method to solve these equations. The accuracy of the method is evaluated by numerical simulations with noisy data and experimentally demonstrated using a PZT thin film placed between two ZnO layers.
Ferroelectrics | 2003
Harmut W. Gundel; Julien Cardin; Dominique Averty; Ludovic Godet; Dominique Leduc; Christian Boisrobert
In order to develop optical waveguide structures using Pb(ZrTi)O 3 ferroelectric thin films, chemical solution deposition and spin-coating on glass substrates were studied. Classical photolithography and wet chemical etching method were applied for the realization of linear and Mach-Zehnder type waveguide structures, having a width of up to 100 w m and a irregularity of the border in the 1 w m region for an overall length of 20 mm. Optical characterization allows to qualify the ferroelectric material in terms of use for telecommunication applications, coupling of laser light by the M-lines technique allows to study light propagation and the related propagation losses.
Optical fiber and fiber component mechanical reliability and testing. Conference | 2001
Lotfi Berguiga; Cyril Lupi; Nicolas Hyon; L. Salomon; Guy Normand; Roger Le Ny; Eric Tanguy; Dominique Leduc; Monique Auvray; Jean Claude Bizeul; Alain Gouronnec; Frédérique de Fornel; Christian Boisrobert; Michel Poulain; Marcel Poulain
The reliability of the network optical fibers is a critical issue for telecommunications. New investigations methods have been developed within a cooperative program supported by France Telecom. They include low coherence interferometry and optical near field microscopy in association with classical analysis tools such as Scanning Electron Microscopy and Shear Force Microscopy. One aim of the study is the localization and the characterization of the defects from which failure originates. The aging effect has been investigated in silica fibers immersed in desionized water at 65 °C and 85 °C for different times : from 3 to 12 months
Fiber and Integrated Optics | 2009
Virginie Gaillard; X.A. Aduriz; N. Daher; Xavier Chapeleau; Dominique Leduc; Cyril Lupi; Nicholas Traynor; Pascal Casari; Christian Boisrobert
Abstract In this article, we describe local and spectral characterization of fibers and integrated optical components using low coherence interferometry. Chromatic dispersion and group birefringence measurements of erbium-doped fibers or photonic crystal fibers are presented, as well as local characterization of fiber Bragg gratings which allows the determination of strain and profile temperature gradient inside a material.
Proceedings of SPIE, the International Society for Optical Engineering | 2007
Virginie Gaillard; Loїc LaLouat; Cyril Lupi; Dominique Leduc; Laurent Provino; Nicholas Traynor; Thanh Nam Nguyen; Thierry Chartier; Frédérique de Fornel; Christian Boisrobert
We present the structure of photonic crystal fibers and give a characterization results in birefringence and chromatic dispersion using scanning near field optical microscopy and low coherence interferometry.
19th Congress of the International Commission for Optics: Optics for the Quality of Life | 2003
Xavier Chapeleau; Dominique Leduc; Cyril Lupi; Christian Boisrobert; Roger Le Ny; P. Graindorge
Recent advances in DWDM system designs have led to a significant increase in the number of wavelengths in a single fiber. As network architects start to apply DWDM to regional and metro networks high performance characteristics for mux/demux (narrow and gaussian passband, weak insertion and polarization-dependent loss, low group delay responses,...) are needed. Accurate measurements of these characteristics become also necessary. In this paper, we focus on the determination of the passband and group delay of a free space optics DWDM and show that the optical low-coherence reflectometry is an efficient method for this kind of measurement.