Thierry Zami

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With the introduction of Nyquist pulse shaping, it is possible to transmit a channel in a spectral window close to its baud rate. To increase the overall network spectral efficiency, the most promising solution seems to be the reduction of the channel spacing. Standardization bodies have proposed a flexible grid with 12.5 GHz of granularity. Hence, 100-Gb/s(More)
Reconfigurable transparent networks are now a reality in the core layer thanks to the implementation of innovative transmission and wavelength routing sub-systems. Transparency on a large scale opens up new perspectives in terms of scalability and flexibility. There are numerous promising technologies to achieve that goal but it is likely that only few of(More)
  • Thierry Zami
  • 2008 10th Anniversary International Conference on…
  • 2008
The quality of transmission (QoT) estimators, envisaged to optimize the impairment constraint routing and wavelength assignment (IC-RWA) in optical transparent networks, are often assessed in a steady configuration by means of re-circulation loops and/or transmissions simulations. In such context the powers of the WDM channels are regularly fixed to a given(More)
Transparent networks are widely seen as the prime candidates for the core network technology of the future. These networks provide ultra high speed end-to-end connectivity with high quality of service and failure resiliency. A downside of transparency is the accumulation of physical impairments over long distances, which are difficult to mitigate using(More)
Optical network telecommunication operators are adopting optical transparency to make the channel routing more flexible, optimize their cost and meet customer requirements. But, the optical signal accumulates physical impairments along the transmission so that its quality should be assessed before setting-up the connection. The relevance of an estimate(More)
The capacity growth driven by increasing traffic and the introduction of new devices and technologies has resulted in new functionalities in optical networks. The property of transparency enables compatibility between different system generations and the coexistence of multiple bit-rates without raising the global network cost. In a transparent network, the(More)