24-280 Multi-aperture Adaptive Optics for

Il y a 2 mois


Paris, France CNES - Centre National d'Etudes Spatiales Temps plein

Doctorat, 36 mois
- Temps plein
- Aucune expérience exigée
- Maitrise, IEP, IUP, Bac+4
- Telecommunications

**Mission**:
Two competing optical strategies, to be deployed on the groundside, are currently studied for turbulence mitigation: Adaptive Optics (AO), and multi-aperture diversity. Focusing on the uplink, AO pre-compensation on a single large aperture is limited in performance due to point-ahead anisoplanatism. Hence the multi-aperture diversity alternative that consists in averaging out turbulence effects via multiple emitters on small apertures and at different wavelengths with the drawback of a reduced spectral efficiency. We believe however that recent developments in these two fields are about to change the overall system optimisation. Indeed, P. Lognoné, our current CNES/ONERA/TelecomParis PhD student, has found a very innovative approach that significantly reduces AO point-ahead anisoplanatism, while, in the meantime, new techniques using polarisation, phase and spectral division are progressively improving the spectral efficiency of multi-aperture diversity.

Research project:
The PhD work is triggered by these recent developments and aims at a joint optimization of optical and digital communication strategies so as to take advantage of the overall channel diversity by exploiting all the degrees of freedom of the channel: spatial, spectral and polarization domain. We aim to investigate in particular hybrid solutions consisting of multiple AO corrected medium size apertures together with smart telecom modalities (modulation format, channel coding, interleaving, MIMO (Multi-Input Munti-Output) coding/decoding...). Reaching this objective implies addressing various research topics:

- study and optimization of the uplink channel with AO assisted multi-aperture configurations in the presence of point ahead anisoplanatism: impact of aperture number and diameter, means to obtain incoherent beam summation while keeping good spectral efficiency,
- study of the diversity of the uplink channel with AO assisted multi-aperture configuration, theoretical assessment of performance limits (channel capacity),
- optimization of the digital signal processing (DSP) modules as modulation format, channel coding/decoding and MISO (Multi-Input Single-Output) schemes.

In summary, the PhD work will provide innovative concepts allowing unprecedented high performance and high data rate optical links from ground to LEO/GEO satellites. Novelty is based on the co-design of optical and digital communication strategies exploiting channel diversity and all physical degrees of freedom of the channel at hand. This work should have a strong impact on the design of future operational systems.

Environment:
The PhD student will benefit of the heritage of former CNES/ONERA PhD works (L. Canuet, P. Lognoné, P. Robles). He will have access to ONERA simulation tools and to unique experimental results coming from: FEEDELIO, the first experimental demonstration of uplink pre-compensation on a slant line of sight relevant of the ground-GEO scenario; and complemented recently by the VERTIGO high data rate optical link terrain demonstration (July 2022; EC H2020 funded project). The PhD student will therefore also benefit from this international collaboration environment.

In the continuity of P. Lognoné’s PhD, this work will be performed under the supervision of, and in close collaboration with, Ghaya Rekaya (Professor at Telecom Paris) who is expert in digital communication and more particularly in MIMO systems. She has also several contributions on DSP for Space-Division Multiplexing Optical fiber communications, and is CEO of MIMOPT, a recently created startup working in this field.

=================

**Profil**:
Master 2 or Engineering schools with majors in Physics, Optics, Telecom, Physics or Signal Processing. Skills : Optics, digital communications, modeling tools

**Laboratoire**:
ONERA

**Message from PhD team**:


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