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Accueil > EN > Recruitment > PhD project

Multimodal photonics – dynamic caracterization of the transmission channel of a few-mode optical fiber

par Johanna Leclercq - publié le

Title of the PhD project :
Multimodal photonics – dynamic caracterization of the transmission channel of a few-mode optical fiber


Name of the PhD Director : Yves Quiquempois
Names of the co-director or collaborator : Esben Ravn Andresen


Laboratory : PhLAM


Identified Research Programmes :
Equipex FLUX, CPER Photonics4Society, ANR PRC « MUPHTA » (soumis à l’AAP 2019)


Summary of the PhD project :
In recent years we have witnessed an increasing demand for high-speed communications. In a few years the current networks based on single-mode optical fibers will no longer be able to respond to the demand. This has been termed the « Capacity Crunch ». Solutions based on multi-mode or multi-core fibers have been proposed, a fiber with N modes (or N cores) can transmit as much information as N single-mode fibers.

This new generation of fibers however face some challenges that single-mode fibers do not, for example a cross-talk between modes which leads to information being mixed between modes, and which is non-constant in time. The aim of this thesis is to implement a fast, dynamic caracterisation of the behaviour of the optical fiber and to exploit the results for developing improved theoretical models of the behaviour of the transmission channel which, in turn, will help to ameliorate the numerical algorithms used in data transmission.

The thesis places itself in continuity of the activities developed by the Photonics group over the last several years : (i) Fiber amplifiers ; (ii) static measurements of the transmission matrix of optical fibers [1] ; (iii) models of coupling between modes ; (iv) optical characterization resolved in space and frequency (S2).

[1] : J. Yammine, et al., Appl. Phys. Lett. Photon.,APL Photonics 4 (2), 022904 (2019), https://arxiv.org/pdf/1810.06643.pdf