Yann Frignac

10.2 Tbit/s (256x42.7 Gbit/s PDM/WDM) transmission over 100 km TeraLight/sup TM/ fiber with 1.28 bit/s/Hz spectral efficiency

We demonstrate the transmission of 256 polarization-division and wavelength-division multiplexed channels at 42.7 Gbit/s rate over 100 km of TeraLight/sup TM/ fiber. An overall capacity of 10 Tbit/s is achieved in C and L bands at a record 1.28 bit/s/Hz spectral efficiency.

Transmission of 256 wavelength-division and polarization-division-multiplexed channels at 42.7Gb/s (10.2Tb/s capacity) over 3/spl times/100km of TeraLight/spl trade/ fiber

10.2Tb/s capacity is demonstrated over 3/spl times/100km in C and L bands, using 42.7Gb/s channels. The wavelength allocation was chosen while taking into account narrow optical filtering at the transmitter and receiver ends and second-order Raman pumping is used to improve the signal-to-noise ratio.

Numerical optimization of pre- and in-line dispersion compensation in dispersion-managed systems at 40 Gbit/s

In the context of 40 Gbit/s terrestrial networks, we have exhibited a simple design rule to help perform dispersion management of single-channel links. The optimal pre-compensation has been shown to vary linearly with the in-line residual dispersion. Moreover, the dependence of these parameters on span length and fiber type has been assessed. Preliminary results have also shown the relevance of this rule in WDM configurations.

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.

Numerical optimization of residual dispersion in dispersion-managed systems at 40 Gbit/s

Through numerical simulations, we optimize the amount of residual chromatic dispersion in 40 Gbit/s single-channel links. It is found proportional to the nonlinear phase, and independent on fiber local dispersion and dispersion map.

Design of multi-terabit/s terrestrial transmission systems facilitated by simple analytical tools

For 30 years, the capacity distance product of lightwave communication systems has continuously doubled every 16 months, to reach more than 10 Pbit/s.km in 2002. Along with this growth, the complexity of system engineering has increased as linear and nonlinear transmission impairments have become more stringent. Dispersion management is widely accepted as a powerful technique to mitigate some of them, but requires numerous experiments or time-consuming numerical simulations to be performed optimally. We exhibit two analytical rules that provide meaningful insight on this matter. Then we show how these rules helped us to improve the transmission distance of a recent 5 Tbit/s transmission experiment from 1,200 km to 1,500 km.RésuméDepuis 30 ans, le produit capacité distance des systèmes de communication optiques a doublé tous les 16 mois. En 2002, il atteignait 10 Pbit/s.km. Parallèlement à cette croissance, l’ingénierie des systèmes est devenue plus complexe du fait de l’impact des effets de propagation linéaires et non-linéaires. La technique de gestion de la dispersion est devenue incontournable mais son optimisation nécessite de nombreuses expériences de validation ou des simulations numériques très gourmandes en puissance de calcul. L’article propose deux règles analytiques pour la mise en place de cette technique et montre comment ces règles ont permis d’aboutir à une expérience récente de transmission à des débits de 5 Tbit/s sur des distances de 1200 à 1500 km.

Research trends in terrestrial transmission systems

The technique of wavelength division multiplexing (WDM) has paved the way for multi-terabit/s capacities in terrestrial optical networks. Recently, we conducted a laboratory experiment to emulate a terrestrial transmission of 6.3 Tbit/s capacity over a record 2700 km distance. After describing some of the specific features of optical terrestrial transmission, we discuss the various technologies possibly involved in such an emulator and discuss their implementation in actual systems, namely the modulation format, the optical amplifier scheme, the 40 Gbit/s electronics and the forward error-correcting codes. To cite this article: S. Bigo et al., C. R. Physique 4 (2003).

NRZ versus RZ format in Nx40 Gbit/s WDM terrestrial transmission systems with high spectral efficiency of 0.4 bit/(s.Hz)

NRZ and RZ modulation format performances are numerically compared for Nx42.66 Gb/s dispersion-managed systems with high spectral efficiency. We highlight the interest of strong optical filtering at the transmitter side for both modulation formats.

BER validation of ring-doping cladding pumped EDFAs for dense WDM applications

By means of back to back BER analysis, we have compared 2 amplifiers (using ring doping and conventional core doping) having similar performance in terms of gain, output power and noise figure. Amplification of the signal out of the fiber core like in the ring-doping technique does not impair the BER measurement nor add penalty to the analysis. We can conclude that this type of fiber can be used in amplifiers for the future high-bit rate WDM systems.