The satellite telecommunication sector is continuously facing new challenges. Operators turn towards increasing capacity payloads with higher number of beams and broader bandwidth, in order to cope with exhausting orbital positions and to lower the cost of in-orbit delivery of bit. Only satellites able to provide high data rate connections to numerous users are expected to achieve affordable communication prices. On the other hand, as the telecom market grows and the range of offered services (HDTV, Video On Demand, Triple Play), operators call for more versatile solutions to quickly grasp new markets and to adapt to these evolutions over the average 15 years of a satellite lifetime.
Flexible payloads have found an increasing interest for a number of years. Flexibility is considered as a means for a better commercial exploitation of a satellite fleet and a better allocation of resource in response to traffic evolution and/or changing business plans, with potential advantages such as a wider range of applications, less customization for specific missions, increased production runs of equipment, enhancement of reliability, reduction of equipment cost, reduction of program schedules [1]. Flexibility is expected to be offered in spectrum management and frequency plan, in coverage, or in the repeater power allocation.
The industry is taking up the challenge both by improving current telecom satellites and offering new payload technology, more flexible and able to address the new markets. From a system integrator perspective, flexibility is as an opportunity to design more generic payloads, that can be customized during or after fabrication only, thus shortening the design-to-manufacturing cycle, and improving the industry competitiveness.
To provide more flexibility in inter-board communication in blade chassis, we developed a Free Space Optical Interconnect (FSOI) system for short range high speed data transfer. We designed robust and low footprint components compliant with both a use in milaero environment and an operation up to 5 and 10 Gbps. The 5Gpbs configuration demonstrated large tolerance to misalignment between emitter and receiver modules: +1.5/-1 mm along optical axis, lateral tolerance of +/-1 mm and angular tolerances of +/-1.5°. Reliable performances have been demonstrated over a temperature range from -30°C to 80°C and constraint environment as thermal and damp heat cycles and vibrations. Increase the data rate of the FSO device one step beyond up to 10 Gbps requires dealing with mode partitioning troubles generated by the use of VCSEL lasers. We designed and evaluated an improved opto-mechanical combination to overcome this drawback. The resulting device shows error free 10 Gbps data transfer while keeping large tolerance to Tx/Rx misalignments.
Henry White, Nick Brownjohn, João Baptista, Vincent Foucal, Henrique Salgado, Anders Clausen, Thomas Pistner, Mark Farries, Stéphane Gauchy, Ilja Kopacek, Andrew Lee, Bruce Napier, Massimo Traversone, James Vincent, Armin Zimmermann
Achieving affordable high speed fiber optic communication networks for airplane systems has proved to be challenging. In this paper we describe a summary of the EU Framework 7 project DAPHNE (Developing Aircraft Photonic Networks).
DAPHNE aimed to exploit photonic technology from terrestrial communications networks, and then develop and optimize aircraft photonic networks to take advantage of the potential cost savings. The main areas of emphasis were on: multiplexing networks; providing standard components; simplifying installation; and reducing through life support costs. DAPHNE (fifteen partners from seven nations) finished in February 2013; and was supported by the European Commission‟s Seventh Framework Programme, although the consortium members are continuing with in-house developments.
D-Lightsys considers free space optical links for intermediate communication distances ranging from a few centimeters to one or two meters. In this paper, we present the initial simulations and the first experimental characterizations of a VCSEL-based point-to-point free space interconnect on distances ranging from 16cm to 40cm targeting bit rates up to 2.5Gbps.
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