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Partie 2 - Systematic

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05Telecom:Mise en page 1 3/11/08 11:54 Page 109<br />

SYSTEM@TIC PARIS-REGION LES PROJETS DE R&D AU CŒUR DE LA RÉVOLUTION NUMÉRIQUE<br />

Project COHDEQ 40 intends to demonstrate the potential of coherent detection associated with Digital Signal Processing for next<br />

generation high density 40Gb/s WDM systems optimized for transparency and flexibility. Key integrated optoelectronics components<br />

and specific algorithms will be developed and system evaluation performed.<br />

////////////////////////////////////////////////////////////////////////////////////////////////////////////////<br />

Contact<br />

Gabriel CHARLET<br />

ALCATEL-LUCENT FRANCE<br />

+33 1 30 77 27 08<br />

gabriel.charlet@alcatel-lucent.fr<br />

COHDEQ40<br />

COHerent Detection of QPSK 40Gb/s<br />

///// GT Télécoms<br />

////////////////////////////////////////////////////////////////////////////////////////////////////////////////<br />

PROJECTS PLANS & DELIVERABLES<br />

The current challenges for the project are:<br />

><br />

Provide hardware elements for realization of QPSK and coherent<br />

detection….<br />

><br />

><br />

Develop algorithm for coherent detection of advanced modulation<br />

format (QPSK, PDM QPSK)<br />

Test system performance of advanced formats associated with coherent<br />

detection in optical transmission test bed and evaluate the<br />

cost benefit at network level<br />

MAJOR PHASES OF THE PROJECT<br />

Pre-development of key opto-electronic elements (modulator, clockeddriver,<br />

coherent mixer, Twin-photodiode with TIA) for QPSK transmission<br />

and detection.<br />

System evaluation of QPSK associated with coherent detection and<br />

comparison with conventional techniques (differential detection).<br />

Propose algorithms including evaluation and optimization (ready for<br />

FPGA implementations)<br />

STATUS<br />

COHDEQ40 started in January 2007. Specifications of transmitter/receiver<br />

have been done. Opto-electronic components are under developments.<br />

Innovative algorithms have been developed for coherent detection and<br />

transmission over several thousand kilometers have been<br />

performed. Impairments introduced by fiber optics propagation such<br />

as chromatic dispersion and polarization mode dispersion (PMD) have<br />

been fully compensated by digital post processing.<br />

A record capacity x distance transmission over optical fiber has been<br />

demonstrated at OFC’08.<br />

////////////////////////////////////////////////////////////////////////////////////////////////////////////////<br />

Partners<br />

Coordinator: Alcatel-Lucent France<br />

Partners:<br />

Alcatel Thales III V Lab, Institut Télécom, IRISA, Kylia,<br />

Photline, XLIM<br />

Major Corporation(s)<br />

SME<br />

Duration: 3 years<br />

Global Budget: 3,2 M€<br />

Funding: 1,3 M€- Agence Nationale pour la Recherche<br />

Académic(s)<br />

109

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