Pascale Nouchi

Transmission of 125 WDM channels at 42.7 Gbit/s (5 Tbit/s capacity) over 12/spl times/100 km of TeraLight/spl trade/ Ultra fibre

The transmission of 125 ETDM channels at 42.7Gbit/s (5 Tbit/s capacity) is demonstrated over 12/spl times/100 km of the new TeraLight/spl trade/ Ultra fibre. The result is obtained with VSB-like filtering at the receiver end and Raman-assisted erbium amplification over C and L bands.

Maximum effective area for non-zero dispersion-shifted fiber

Summary form only given. In this paper, we focus on design issues for non zero dispersion shifted (NZ-DSF) fibers with large effective areas. We quantify performances of various index profile designs on a theoretical basis. What is the maximum possible effective area to be expected given a specific bending loss and index profile shape.

Adaptive holographic interferometer at 1.55 μm based on optically addressed spatial light modulator

We report the realization of an adaptive holographic interferometer based on two-beam coupling in an optically addressed liquid crystal spatial light modulator operating at 1.55-μm. The system allows efficient phase demodulation in noisy environment and behaves as an optical high-pass filter, with a cut-off frequency of approximately 10 Hz, thus filtering slow phase disturbances (due to, for example, temperature variations or low frequency fluctuations) and keeping the detection linear without the need of heterodyne or active stabilization.

Modeling the non-linear index of optical fibers

We propose and validate experimentally a simple model that allows us to calculate the nonlinear index, n/sub 2/, of any fiber type. Single-mode and higher-order-mode dispersion-compensating fibers (DCF) are investigated and n/sub 2/ dependence on chromatic dispersion is analyzed.

Analytical solution of polarization mode dispersion for triangular spun fibers

An analytical solution for the differential group delay of a fiber spun according to a triangular function is derived from concatenation of Jones matrices for a fiber length equal to N x T, where T is the spinning period and N is an integer. This solution holds for any value of linear deterministic birefringence delta beta of amplitude A and period T of the triangular spinning function. We use the solution to emphasize the effect of birefringence on the efficiency of the spinning function.

Optimized NZDSF-based link for wide-band seamless terrestrial transmissions

We have designed and manufactured an optimized nonzero dispersion shifted fibre (NZDSF) based link for wide-band seamless terrestrial transmissions through minimization of higher-order dispersion (up to 4/sup th/-order dispersion). This link is composed of a new low-slope NZDSF with optimum dispersion of /spl sim/8 ps/nm-km and slope of /spl sim/0.03 ps/nm/sup 2/-km@1550 nm and a matched dispersion compensated fibre (DCF) in a module with low and flat attenuation over the S-, C- and L-bands. A maximum link-dispersion variation of /spl plusmn/0.18 ps/nm-km over 165 nm-bandwidth ranging from 1460 to 1625 nm was experimentally demonstrated. This is to our knowledge the lowest dispersion variation reported to date over such a wide bandwidth.

High-order dispersion-managed solitons for dense wavelength-division multiplexed transmissions

Optimal dense wavelength-division multiplexed transmission is obtained based on high-order periodic dispersion-managed solitons in a dispersion-slope-compensated fiber link.

Recent developments in optical fibers and how defense, security and sensing can benefit

For many years, fiber manufacturers have devoted research efforts to develop fibers with improved radiation resistance, keeping the same advantages and basic properties as standard fibers. Today, both single-mode (SMF) and multimode (MMF) RadHard (for Radiation-Hardened) fibers are available; some of them are MIL-49291 certified and are already used, for example in military applications and at the Large Hadron Collider (LHC) in CERN or in certain nuclear power plants. These RadHard fibers can be easily connected to standard optical networks for classical data transfer or they can also be used for command control. Using some specific properties (Raman or Brillouin scattering, Bragg gratings...), such fibers can also be used as distributed sensing (temperature or strain sensors, etc) in radiation environments. At least, optical fibers can also be used for signal amplification, either in telecom networks, or in fiber lasers. This last category of fibers is called active fibers, in opposition to passive fibers used for simple signal transmission. Draka has also recently worked to improve the radiation-resistance of these active fibers, so that Draka can now offer RadHard fibers for full optical systems.

Advance in long-haul fibers

Dramatic increase in transmission systems capacity has recently been reported in long-haul terrestrial transmission systems. This paper will review advances in transmission and compensating fibers that opened the door to such transmission capability improvements.

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.