Researcher (M/F) on nonlinear propagation in multimode fibers

Organisation/Company CNRS Department XLIM Research Field Engineering Physics Technology Researcher Profile First Stage Researcher (R1) Application Deadline 31 Mar 2026 - 23:59 (UTC) Country France Type of Contract Temporary Job Status Full-time Hours Per Week 35 Offer Starting Date 1 Jun 2026 Is the job funded through the EU Research Framework Programme? Horizon 2020 Is the Job related to staff position within a Research Infrastructure? No

Offer Description

The researcher's mission will be to study nonlinear propagation in multimode optical fibers. These fibers may be solid-core or gas- or liquid-filled. Coupled-core fibers will also be used. The researcher will also seek to demonstrate the impact of a high-energy pump wave on a weak wave through cross-modulation. This primarily experimental work will also focus on analyzing the radiation at the fiber output through the development of a modal decomposition system.

The main activity will be to set up an experimental system for nonlinear propagation in multimode fibers and to perform spatial, spectral, and temporal analyses of the radiation emitted from the fiber.

This radiation can be used in experiments to measure linear and nonlinear effects such as:

• The nonlinear refractive index of the fiber core
• The intra-fiber disorder
• The self-focusing process of the pump wave
• The nonlinear frequency conversion
• The self-selection of transverse modes

This work will be carried out in Limoges at the XLIM UMR 7252 laboratory, within the Photonics research group and the Biophotonics team. This work is proposed within the framework of a European ERC Synergy 2025 project entitled "Multiprobe." The project aims to develop optical fibers enabling the development of a multimodal endoscopic system. This research project is conducted with Italian partners in Rome (Sapienza University, Catholic University of Rome, Gemelli Institute).

• Skills in hollow core multimode optical fibers and silica-core fibers
• Knowledge of multimodal propagation in optical fibers, in second (poling process) - and third-order optical nonlinear effects in silica fibers
• Use of high-power laser sources
• Proficiency in high-power optical radiation
• Knowledge of numerical simulation of nonlinear effects
• Knowledge of English