Résumé des résultats (Abstract)
(Italien)
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Novel monolithic components are to be developed for ultrahigh line-rate communications systems to reduce the cost and complexity of existing high-power-consumption, large-footprint optical time division transmitters and receivers. The project will involve the design, fabrication and demonstration of new integrated sources and compressors of high-quality, ultra-short pulses at high repetition rates suitable for use in next generation optical time division multiplexing systems (OTDM). The components will then be tested on a point to point OTDM system where an assessment of their performance will be obtained. The project will finally include detailed systems studies, which will seek to identify novel system architectures using the components.
Objectives:
The main objective of the present proposal is the design and fabrication of a monolithic source of ultra fast, high repetition rate, optical pulses suitable for the next generation communication systems, compatible with both optical time division multiplexing(OTDM) and wavelength division multiplexing (WDM). In addition, adaptive monolothic pulse shaping elements will be developed which may be integrated with the source and/or the receiver to ensure high quality pulse generation, and overcome cross talk and allow threshold at the receiver. Finally, a complementary objective of the project will be the experimental assessment of their performance as pulse generator in a point to point transmission system.
Work description:
Monolithic mode-locked lasers are to be designed with superior wavelength and timing stability through the use of novel sampled grating structures. Such grating designs would be developed for repetition rates of 40-160 GHz so as to be compliant with anticipated future communications technology. The reflection spectrum will be tailored to ensure a well-defined peak for optimum wavelength stability while maintaining a broad reflection bandwidth for optimum duration and stability of pulses. The target for this work will be the generation of pulses with 1 ps durations. In the MONOPLA project, the Tampere University of Technology (ORC), well established in the field of MBE wafer growth, will provide low chirp, high gain strained layer material for the laser and pulse shaping elements. The Institute d'Electronique et de Metroélectronique du Nord (IEMN) will provide e-beam facilities for sampled grating definition. Opto Speed, an SME with extensive expertise in IST projects, will provide re-growth and device processing capability. IEMN with its expertise in microwave electronics and packaging will provide the subassembly facilities and also support device fabrication work. Design and device assessment will be jointly from the Universities of Carlos III Madrid and Cambridge, who have extensive and relevant device experience from the EU funded projects FALCON and HIGHWAY respectively. Systems simulations will be performed by Nortel Networks who are world leading in the field of high data rate telecommunications. Nortel Networks will also make available a 160Gb/s system test-bed available within the consortium, used to optimise device design in terms of pulse characteristics and pulse processing schemes providing direct feedback to device design.
Milestones:
M1)Device specifications: Supplies device desired characteristics. Due month 6;M2)Device design: Hands the device structure for device processing. Due month 15;M3)Device fabrication: First set of sample devices ready. Due month 18;M4)Advance devices: New samples after feedback from tests. Due month 21.At the project end, samples of high performance devices will be available.
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