Search results for: T. Zami
chapter
This field trial transmits 1.5Tb/s superchannel with 5b/s/Hz spectral efficiency over 875km of EDFA-amplified SMF, using six 250Gb/s real time elastic transponders featuring 1dB minimum Q margin over 48 hours. Channels are 50GHz spaced.
article
IEEE/OSA Journal of Optical Communications and Networking > 2016 > 8 > 7 > A12 - A22
The elastic optical network (EON) is a paradigm for optical networks, based on the combination of a flexible grid, advanced transmission techniques, and bandwidth-variable optical switching. Recent studies on EONs have been focused on multi-carrier transponders with coherent detection. Such transponders can achieve high-rate (e.g., 1 Tb/s) lightpaths through super-channels. A particular case of the...
chapter
Accounting for tight filtering impairments, we show why the ideal extra capacity of 33% brought by 37.5GHz channel spacing (compared to 50GHz) may be significantly reduced under physical constraints of fully transparent meshed networks.
chapter
We investigate the crosstalk tolerance of 112 Gb/s PDM-QPSK channels for various temporal or spectral configurations of the detected and the crosstalk signals. We also illustrate usual bandwidth characterizations are not appropriate for coherent detection.
chapter
In the context of “multiflow” application optimizing the operation of superchannel transponders, this study compares different candidates for N×M Wavelength Selective Switch used as colorless, directionless, and contentionless add/drop stages.
chapter
We propose a novel model for core optical networks combining benefits of transparent and opaque networks through variable channel spacing. We demonstrate increased capacity at limited energy cost through detailed transmission experiments and network planning.
chapter
To cope with increasing traffic, optical networks have steadily adopted faster interfaces. Interfaces working at 40 Gb/s were recently introduced in networks already deployed at 10 Gb/s; moreover, 100 Gb/s interfaces have been demonstrated in laboratory experiments. As this upgrade in bit-rate tends to evolve over time scales faster than the lifetime of deployed systems, wavelength division multiplexed...
chapter
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 depends on the uncertain knowledge of the physical...
chapter
We present an upgraded circulating loop to simply account for the actual impact of the different channels optical routings when assessing the transmission performance in the WDM transparent networks.
chapter
Confidence level on connection feasibilities is used to obtain Q-estimate margins when parameter uncertainties are considered. Adding such margins to the Q-estimate instead of fixed margins gives 22% fewer regenerators at same 97.5% confidence level.
chapter
We show that 43 Gb/s DPSK channels aligned on the 50 GHz ITU grid remain tolerant to crosstalk thanks to the narrow optical filtering functions of the traversed transparent nodes and their different routing states.
chapter
We justify a lightpath characteristic dependent margin when estimating the quality of transmission for the establishment of a connection by showing the resulting better prediction accuracy and eventually the reduction of the required transmission resources.
article
Comptes rendus - Physique > 2008 > 9 > 9-10 > 985-1001
The emergence of new devices and technologies introduces new trends and design issues for optical transport networks. The higher performance of transmission and switch systems enables the reduction of optoelectronic conversions in intermediate nodes with the introduction of transparency in the network. Simultaneously, the system of Automatic Switched Optical Networks (ASON) describes the rules for...
chapter
As optical networks are moving towards transparency to save expensive optoelectronic conversions, 40 Gb/s transmission technology appears on the field to meet the increasing capacity requirements. An advantage of transparent network is its independence of the bit rate and modulation format. Hence the transition from 10 to 40 Gb/s in a transparent network can be imagined as a gradual replacement of...
chapter
We illustrate the importance to consider physical uncertainties in the quality of transmission estimators used for impairment constrained based routing. Power uncertainties of 1 dB yield 80% of further regenerators.
chapter
We introduce a new routing method, 10-40 Gb/s synergy, that reduces the blocking probability of at least 15% against classical routing with both bit-rates. The transmission estimator enables better performance.
chapter
A collection of slides from "Optimized synergy between 10 Gb/s and 40 Gb/s channels on a partially transparent network" conference presentation is given.
chapter
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 them will really prevail in the field. For...
chapter
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 set of values related to a given point of...
chapter
The impact of the quality of transmission estimator margin on the prediction accuracy for a connection establishment in network planning is studied as a function of the knowledge of the actual chromatic dispersion map.
