Abstract
We present some theoretical and experimental results which suggest the possibility of constructing a non-empirical methodology of designing optical transmission systems with ultra high bit-rate per channel. Theoretically, we present an average dispersion decreasing densely dispersion-managed (A4dm) fiber system, which exhibits many advantages over the densely dispersion-managed fiber system, such as the possibility of transmitting chirp-free Gaussian pulses at 160 Gbit/s per channel over transoceanic distances, with a reduced energy and minimal intra-channel interaction. Experimentally we present generation of a 160-GHz picosecond pulse train at 1550 nm using multiple four-wave mixing temporal compression of an initial dual frequency beat signal in the anomalous-dispersion regime of a non-zero dispersion shifted fiber. A complete intensity and phase characterization of the pulse train by means of a frequency-resolved optical gating technique is achieved, showing generation of transform-limited pedestal-free Gaussian pulses.
Résumé
Nous présentons des résultats théoriques et expérimentaux qui suggèrent la possibilité de construire une méthodologie non empirique de conception de lignes à très haut débit par canal (≥ 160 Gbit/s). Théoriquement nous présentons la ligne de transmissiona4dm, où la gestion de la non-linéarité s’effectue en faisant décroître par palier la dispersion moyenne le long du pas d’amplification. Cette ligne démontre la possibilité de transmettre des impulsions gaussiennes initialement non chirpées à un débit de 160 Gbit/s sur des distances transocéaniques, avec un niveau d’énergie nettement plus petit que dans le cas de lignes à haute densité de gestion de la dispersion et sans gestion de la non-linéarité. Expérimentalement, nous présentons des résultats mettant en évidence la génération d’un train d’impulsions picosecondes à une fréquence de répétition de 160 GHz et à la longueur d’onde de 1550 nm. La technique mise en oeuvre repose sur la compression temporelle non linéaire d’un battement de deux fréquences injectées dans une fibre optique à dispersion décalée en régime de dispersion anormale. Le processus physique non linéaire à l’origine de la compression temporelle est un mélange à quatre ondes en cascades. Une caractérisation complète en intensité et en phase du train d’impulsions ainsi généré est réalisée à l’aide d’une technique d’autocorrélation résolue en fréquence. Cette caractérisation met clairement en évidence la génération d’un train d’impulsions gaussiennes en limite de Fourier et sans piédestal.
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Tchofo Dinda, P., Labruyere, A., Nakkeeran, K. et al. On the designing of densely dispersion-managed optical fiber systems for ultrafast optical communication. Ann. Télécommun. 58, 1785–1808 (2003). https://doi.org/10.1007/BF03001226
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DOI: https://doi.org/10.1007/BF03001226
Key words
- Optical telecommunication
- Optical fibre transmission
- Wave dispersion
- System design
- High rate
- Ultrashort pulse
- Four wave mixing
- Stimulated Raman scattering
- Non linear equation
- Theoretical study
- Experimental result
- Long distance transmission
- Pulse generator