Jacques Marcou

Theoretical and experimental analysis of a chromatic dispersion compensating module using a dual concentric core fiber

New designs of optical fibers are widely used in dispersion compensating module (DCM) inserted in optical links to improve the bit rate. Dual concentric core fibers (DCCFs) can exhibit a very large negative dispersion coefficient and a large figure of merit well suited for DCM applications. However, these fibers intrinsically propagate two supermodes. So a selective injection of the mode of the central elementary guide of DCCF can be realized by the input connection with a single-mode fiber to obtain a negative dispersion. In this paper, we demonstrate theoretically and confirm experimentally the impact of this particular injection. The complete association of a DCCF connected on each end with single-mode fibers, corresponding at a DCM, is studied. A new definition of the chromatic dispersion (CD) for a DCM based on the phase delay method is established. The corresponding curve presents two symmetric maxima and becomes null at the phase matching wavelength. Experimental verification is presented and the influence of the optogeometrical parameters on the evolution of the CD is also discussed.

Design of a high negative chromatic dispersion in a single mode optical fibre : effect of the central index dip

In this paper, we present the simulation results, using a cylindrical coordinates beam propagation method, of the effect of the central index dip in an optical fibre with high negative chromatic dispersion at 1.55 μm. This leads to the definition of an equivalent core area dependence of the position and the amplitude of the negative chromatic dispersion value achieved using such fibre geometry.

Theoretical and experimental study of light propagation into novel fibers designed for the management of chromatic dispersion

The finite element method and the beam propagation method are demonstrated to be particularly suitable for precisely modeling the propagation into novel fibers such as transverse-Bragg-grating photonic-band-gap fibers or holey fibers. Modes patterns observed at the output end of each kind of fiber are described.

Management of chromatic dispersion in three recently studied optical fibers

Starting from the discussion of the simple expression of the waveguide dispersion, it is shown that fibers with three novel index profiles allow to easily control the chromatic dispersion.

Very first evidence of propagation in a modified chemical vapour deposition photonic-band-gap fibre (Bragg type)

Summary form only given. We show the first depressed-core-index photonic-band-gap (DCI-PBG) fibre manufactured by means of the classical MCVD technique. It has been designed to propagate a robust zero dispersion single mode at wavelengths as short as 1 /spl mu/m. The main applications deal with non-linear optics: soliton propagation, parametric amplification and oscillators, this fibre consists in a low-index cylindrical core surrounded by a cladding made of layers with alternating high and low indices, which values are higher than that of the core. It has been theoretically demonstrated in a previous paper that such a fibre can propagate one single guided mode. We have designed the DCI-PBG fibre for simultaneously obtaining a suitable coupling to standard fibres and achieving a zero dispersion at /spl lambda//sub 0/=1.06 /spl mu/m by the aim of a two dimensions scalar cylindrical finite-difference beam propagation method (2D FD-BPM) associated to the Wijnands method. The chromatic dispersion of the guided mode is presented at the conference.