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Optical chaos Communications Using Laser-Diodes Transmitters

Objective

The main objective of this RTD project is the experimental realisation of an innovative laser based technique to encode information within a chaotic carrier. This novel technique profits from the intrinsic non-linearities present in nowadays high-speed telecommunication transmitter diode lasers. The technique explores the concept of synchronisation of two spatially separated chaotic laser systems, one being at the emitter side and the other at the receiver side of the telecommunication channel, with the goal of enhancing privacy in the transmission of codified data by encoding at device level. We explore techniques suitable for the implementation in high-speed fibre-based optical communication systems, with emphasis in designs that can take advantages of the already installed optical fibre networks. The system targets data transmission at Gbit/s. The main objective of this RTD project is the experimental realisation of an innovative laser based technique to encode information within a chaotic carrier. This novel technique profits from the intrinsic non-linearities present in nowadays high-speed telecommunication transmitter diode lasers. The technique explores the concept of synchronisation of two spatially separated chaotic laser systems, one being at the emitter side and the other at the receiver side of the telecommunication channel, with the goal of enhancing privacy in the transmission of codified data by encoding at device level. We explore techniques suitable for the implementation in high-speed fibre-based optical communication systems, with emphasis in designs that can take advantages of the already installed optical fibre networks. The system targets data transmission at Gbit/s.

OBJECTIVES
The general objective of the proposal is the experimental demonstration of an emitter/receiver chaotic optical system capable to transmit encoded information through optical fibres. Our proposal is directed at improving the privacy in the transmission of secure data in the context of the increasing volumes of data that fibre-based optical networks carry. We concentrate on relatively high bit rate fibre-optic communication systems utilising semiconductor diode lasers as the optical sources. Our approach exploits the properties of the dynamically chaotic emitter and receiver systems that, under specific conditions are able to synchronise, and therefore allow for the encryption and decryption of messages at a device level. Our technique is complementary and fully compatible with other existing methods for encoding information.

DESCRIPTION OF WORK
The methodology to be used will be based on a strong co-operation between theoretical modelling and experimental proofs. The work will progress as an integrated entity wherein experimental work is both interpreted and informed on the basis of detailed theoretical modelling and design work. The main work will be predicated on the use of state-of-the-art laser diodes and other optoelectronic and optical components thus underlining the inherent reliability of the proposed methodology.

The main elements of the project can be summarised as:
1) The utilisation of laboratory demonstrators for chaotic optical signal generators, both in power and wavelength, to effect synchronisation of emitter and receiver chaotic sub-systems. The experimental work will utilise edge-emitting laser diodes with the main effort given to the use of a suitable electro/optical and all optical nonlinearity for generation of optical chaos. Project work will be directed at demonstrating that such techniques can be achieved in a robust manner to permit practical deployment within a system demostrator;
2) The demonstration of the effectiveness with which chaotic encoding can be used to achieve data transmission between synchronised chaotic emitters and receivers that are connected by an optical fibre. Evaluation of robustness and sensitivity of the different proposed schemes, with further development of the most suitable one;
3) Establishing the integrity of the chaotic encoding technique. With a view towards a future development, the specification of monolithic chaotic emitter/receiver components will be defined incorporating outcomes of the analysis of alternative implementations.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

UNIVERSITAT DE LES ILLES BALEARS
Address
Carretera De Valldemossa Km 7.5
07071 Palma De Mallorca
Spain

Participants (6)

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
France
Address
3, Rue Michel-ange
75794 Paris Cedex 16
CONSEJO SUPERIOR DE INVESTIGACIONES CIENTIFICAS
Spain
Address
C/ Serrano 117
28006 Madrid
NATIONAL AND KAPODISTRIAN UNIVERSITY OF ATHENS
Greece
Address
30 Panepistimiou Str.
10679 Athens
TECHNISCHE UNIVERSITAET DARMSTADT
Germany
Address
Karolinenplatz 5
64289 Darmstadt
UNIVERSITA DEGLI STUDI DI PAVIA
Italy
Address
Strada Nuova 65
27100 Pavia
UNIVERSITY OF WALES, BANGOR
United Kingdom
Address
Finance Office, University Of Wales, Bangor, College Road
LL57 2DG Bangor