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FIDELIO
Fibre Laser Development for Next Generation LIDAR Onboard Detection System

Background

The necessity of finding a practical solution for onboard detection of atmospheric hazards such as wake vortices, wind shear, and clear air turbulence is a well-established need, and has been the subject of intense European research in programmes such as MFLAME and now I-Wake. LIDAR has been shown to be an optimal tool for on-board detection of hazards. LIDAR systems used so far have been based on solid-state laser technology, which does not meet commercial aircraft requirements for onboard implementation due to power consumption, size, weight, reliability and high life cycle cost.

Project objectives

The purpose of this programme is to introduce the next logical step in wake vortex detection by developing a unique fibre laser technology (1.5 micron wavelength) geared for the aerospace industry requirements, enabling on-board realisation of a LIDAR atmospheric hazard detection system. The goals of this programme meet the Sixth Framework Programme strategic objectives including ‘Improving Aircraft Safety and Security’ and ‘Increasing the Operation Capacity of the Air Transport System’. The numerous aerospace applications require both a high-level coherence and high energy per pulse, an issue which has not been addressed in the telecommunications and industrial laser technologies, hence the essential need to bridge this technological gap in fibre laser systems for aerospace applications. The fibre laser-based LiDAR to be developed in this programme will enable a major technological breakthrough attainable only at a European level with participation of the major European laser and aeronautics companies. The synergy with other EU programmes will enable the technological breakthrough essential in realising a feasible on-board aircraft safety system.

Description of the work

The development of the fibre laser-based Lidar system is a challenging task. Hence, the programme has been structured in a manner that enables risk reduction in order to reach the desired goals. The Work Packages are broken down into the following topics: programme coordination and management (lead by ELOP), System Specification and LiDAR Modelling (lead by ONERA), Laser Architecture and Modelling (lead by Thales Research & Technology), Fibre Development and Fabrication (lead by IPHT), Laser System Integration (lead by ELOP), LiDAR System Realisation (lead by ONERA), and Exploitation (lead by Thales Avionics). The system specification will be based upon previous EC programmes and will be geared specifically to the onboard requirements (size, power consumption, etc.). The fibre laser development is very challenging and includes high-energy requirements, single mode operation, single frequency, polarisation maintaining, and more. In order to reduce the risks in the programme, the initial stages of laser development will focus on three possible fibre laser architectures, each with their own advantages and disadvantages. After 18 months, the leading laser architecture will be decided upon and that architecture will be implemented in the final laser-engineering prototype. The fibres themselves are a critical building block in the system and hence much effort will be placed in the development of fibres able to meet all of the demanding requirements (single mode, high energy, polarisation maintenance, etc.). The engineering fibre laser prototype will be implemented in the LiDAR system where particular attention will be placed to the (real-time) signal processing and system testing. The testing will include ground testing at the end of a runway to measure the wake vortices. Although, due to budgetary limitations, the testing will be performed on the ground, the system will be developed so that the move to on-board implementation will be as smooth as possible. Exploitation will be a constant theme in the course of the programme, where a Users Club has been established (members include Dassault) to provide input to the relevant market and end-user needs. The I-Wake programme, which is in its final phases, will also be a source of input to the needs and requirements of the on-board system and so a synergistic use of the EC-funded projects will be seen.

Expected results

The expectations of the project include realisation of a LiDAR system capable of accurately measuring the wake vortices and geared for on-board implementation. The fibre laser technologies will enable the leap forward to on-board implementation. The system will be designed so that solutions to the various on-board restraints, including power consumption, footprint, heat dissipation, environmental robustness, flexibility, etc. will be taken into consideration. The signal processing developed during FIDELIO will enable the move to real-time processing, demonstrating further convergence towards an on-board system.

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