Bruno Dany

Recovered efficiency of filter control in dispersion-managed solitons for optical regeneration applications: analysis and experimental validation

We demonstrate numerically that local conversion of dispersion-managed return-to-zero pulses into nonlinear Schrödinger solitons fully restores optical filtering control for energy stabilization, thus permitting the association of optical regeneration with dispersion-managed propagation. Experimental validation is achieved by means of 40-Gbit/s regenerated dispersion-managed loop transmission over 10,000 km.

Stability and optimization of dispersion-managed soliton control.

Dispersion-managed solitons with in-line all-optical regeneration are shown to be subject to amplitude and timing-jitter instabilities. We identify and discuss the different natures of these instabilities by means of a linear stability analysis, which is in good agreement with the full numerical solutions of the governing equations. Stable pulse propagation can be achieved through appropriate choices of dispersion map and pulse energy.

Stability of synchronous intensity modulation control of 40-Gb/s dispersion-managed soliton transmissions

The efficiency of transmission control of dispersion-managed solitons by means of in-line synchronous intensity modulation is numerically analyzed. We demonstrate that intensity modulation may lead to dramatic improvements in the transmission performance of 40-Gb/s dispersion-managed solitons. In particular, we identify the locations within the dispersion map where synchronous intensity modulation provides an efficient control of the pulse propagation. Namely, a stabilization of pulse energy fluctuations is achieved, with no need for additional in-line control by guiding filters. On the other hand, incorrectly placed intensity modulation may cause significant pulse instabilities.

40 Gbit/s polarization-independent, push-pull InP Mach-Zehnder modulator for all-optical regeneration

A polarization independent, push-pull InP Mach-Zehnder modulator for 40 Gbit/s all-optical regeneration was implemented. Error-free regenerated transmission over more than 20,000 km is demonstrated. Wavelength independence and immunity to crosstalk is also measured, showing potential for WDM transmission applications.

Optical communication and fiber design

Optical fiber has evolved from a not-so-transparent glass tube to an extraordinarily efficient transmission medium. It is now acknowledged as a central element of modern telecommunication being part of the whole optimization process to further improve transmission system performance and cost. In this paper, we briefly introduce transmission system optimization problematics as well as key fiber characteristics. We then review the elements of fiber design for optimized optical communication networks, including metropolitan, long and ultra-long haul applications and show how fibers have evolved over the last ten years to keep pace with more and more demanding requirement of transmission system.RésuméD’un tube de verre peu transparent, la fibre optique a évolué vers un moyen de transmission d’une remarquable efficacité. La fibre est maintenant reconnue comme un élément central des réseaux de communications modernes. Son optimisation permet d’améliorer les performances et les coûts des systèmes de transmission. Dans cet article, nous rappelons les problèmes mis en jeu dans l’optimisation d’un système de transmission, ainsi que les caractéristiques essentielles des fibres optiques. Nous présentons ensuite les éléments clés de la conception des fibres qui ouvrent la voie à des réseaux de communications optimisés, incluant les applications pour le métropolitain, les longues et ultra-longues distances. Enfin, nous montrons comment les fibres ont évolué pour s’adapter aux contraintes toujours plus fortes imposées par les systèmes de transmission.

Optimization of 40 Gbit/s dispersion maps for long-haul WDM transmissions with up to 0.4 bit/s/Hz spectral efficiency

We numerically study optimal line dispersion management for 40 Gbit/s-based long-haul transmission systems, when considering first single-channel, and second WDM systems with 200 GHz and 100 GHz channel spacing.

Optimized TeraLight/spl trade//Reverse TeraLight/sup /spl copy// dispersion-managed link for 40 Gbit/s dense WDM ultra long-haul transmission systems

We present here numerical simulations showing that to alternate +8 ps/(nm.km) and -16 ps/(nm.km) chromatic dispersion fibers is an optimized solution for 40 Gbit/s-based dense WDM ultra long-haul RZ systems. Experimental measurements on such a 200 km-long dispersion map show an ultra-flattened dispersion profile.

Recovered efficiency of optical regeneration control on dispersion-managed solitons : analysis and application to a 32/spl times/40 Gbit/s transoceanic system

We numerically demonstrate that a local conversion from dispersion-managed soliton to nonlinear Schrodinger soliton restores the efficiency of optical regeneration control and enables the transmission of 32/spl times/40 Gbit/s over transoceanic distances with high spectral efficiency (1.4 nm channel spacing).

Experimental validation of new regeneration scheme for 40 Gbit/s dispersion-managed long-haul transmission

We experimentally show, for the first time, that optical 3R-regeneration by synchronous modulation can be efficiently implemented in dispersion-managed transmission. Successful association of both techniques is demonstrated at 4O Gbit/s over more than 10000 km.

Stability analysis of dispersion-managed soliton propagation with reamplification, reshaping, and retiming all-optical regeneration

We analyze the propagation stability of dispersion-managed solitons in long-distance fiber optic links, as it is influenced by in-line control elements such as synchronous intensity modulators and filters. The soliton stability analysis permits us to optimize dispersion map design as well as the input optical pulse’s energy and prechirp in the presence of periodic all-optical regeneration. Substantial agreement is obtained between the predictions of linear stability analysis and beam propagation simulations. Dispersion mapping and control are optimized for amplification, reshaping, and retiming regeneration of long-haul transmissions at a 40-Gbit/s channel rate.