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Theses

Utilisation de la détection cohérente pour les systèmes de transmission optique à 40 GB/s ET 100 GB/s

Abstract : The next generation of fibre-optic internet infrastructure will involve long-haul transmission systems with wavelength-division-multiplexed (WDM) channels at 40 and 100 Gb/s, and will be most likely based on coherent detection. This thesis focuses on these systems. We first demonstrate their unparalleled tolerance to linear fibre impairments, thanks to digital signal processing in the receiver, making them compatible with the legacy fibre infrastructure. Nevertheless, on top of linear fibre effects, optical systems may be limited by nonlinear fibre effects. This thesis gives insights on the nonlinear behaviour of signals detected with a coherent receiver, especially when multiplexed in polarisation. We show that the two polarisation components interact nonlinearly, which limits the system reach, even if a single channel is used. We particularly investigate the evolution of the impact of nonlinearities when increasing the bit rate from 40 to 100 Gb/s. We demonstrate that moving to higher symbol rates increases the tolerance to cross nonlinearities. This thesis also gives further insight on the interaction between polarisation mode dispersion (PMD) and nonlinearities. Unlike legacy systems, we have proved that, when distributed, PDM often turns out to be beneficial by reducing these nonlinear-induced penalties. On the contrary, when lumped, PMD may further increase the detrimental impact of nonlinearities. Finally, as a proof of the carriers' interest in 100 Gb/s technologies, this thesis reports the results of a field trial we have recently conducted on Telefónica's network in Spain showing the potential of coherent technologies to upgrade already deployed networks.
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https://pastel.archives-ouvertes.fr/pastel-00676633
Contributor : Oriol Bertran Pardo <>
Submitted on : Monday, March 5, 2012 - 5:53:05 PM
Last modification on : Friday, July 31, 2020 - 10:44:09 AM
Long-term archiving on: : Wednesday, December 14, 2016 - 10:37:38 AM

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  • HAL Id : pastel-00676633, version 1

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Oriol Bertran Pardo. Utilisation de la détection cohérente pour les systèmes de transmission optique à 40 GB/s ET 100 GB/s. Optique / photonique. Télécom ParisTech, 2010. Français. ⟨pastel-00676633⟩

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