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Étude de la dispersion modale de polarisation dans les systèmes régénérés optiquement

Abstract : With the constant increase of the line bit rate, optical effects creating temporal distortions of pulses are more and more critical. Polarisation mode dispersion (PMD) in the installed fiber plant can limit the transmission distance for 40 Gbit/s signals. Future all optical networks will integrate optical functions for wavelength conversion and regeneration in their switching nodes. In this manuscript we will particularly examine the capability of optical regenerators to combat PMD. If their efficiency is proven they will naturally constitute a cascade of PMD compensators distributed in the network.
After a general introduction to optical transmission systems and to thepolarisation mode dispersion, we present optical regeneration techniques. We propose an original method to characterise the behavior of a regenerator in the presence of PMD, to calculate the outage probability of a link including a regenerator and to study its optimal position within the link.
2R regenerators can be classified into two categories: type I regenerators process pulses without shaping them while type II regenerators give a specific shape to the pulses. The numerical study of the ability for a type I regenerator to combat PMD in a single passage clearly shows that placing a regenerator directly in front of the receiver is useless. Only placing the regenerator inside the link allows to compensate for PMD and its e ciency is maximum when placed close to the middle of the link.
The regeneration technique based on self phase modulation and a detuned filter constitutes a good example of type II regenerators. By its very principle, this regenerator provides a natural way of compensating PMD. But a deep theoretical and experimental investigation shows that it cannot compensate for PMD in a single passage.
This work is concluded by studying the impact of PMD on electrical and optical clock recovery techniques, one of the key components of each 3R regeneratoror receiver. Simple electronic techniques cannot be used because of the electrical spectral “hole burning” effect induced by PMD and the induced clock-data time shift. However using optical clock recovery techniques allows to avoid these two limitations. In particular self-pulsating lasers are very promising components for performing optical clock recovery in the presence of PMD. And their use in a new 3R regenerator allows to demonstrate the possibility of PMD compensation by a 3R regenerator with a simple architecture.
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https://tel.archives-ouvertes.fr/tel-00353460
Contributor : Sylvain Fève <>
Submitted on : Thursday, January 15, 2009 - 3:46:48 PM
Last modification on : Tuesday, January 12, 2021 - 4:50:31 PM
Long-term archiving on: : Saturday, November 26, 2016 - 4:22:10 AM

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  • HAL Id : tel-00353460, version 1

Citation

Benoît Clouet. Étude de la dispersion modale de polarisation dans les systèmes régénérés optiquement. Physique [physics]. Université Rennes 1, 2007. Français. ⟨tel-00353460⟩

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