DEDUYTSCHAEVER Martin : Conception, realization and characterization of multicore fibers for ultra high-speed Telecommunications

Résumé de thèse :

Single mode fibers (SMFs) are encountering a bottleneck in their capacity, despite an ongoing demand for high-speed data transmission. This pressing issue has sparked a concerted effort towards the exploration and development of novel fiber technologies aimed at enhancing per-fiber capacity. Among these emerging technologies, multicore fibers (MCFs) appear to be particularly promising alternatives to traditional SMFs. MCFs represent a paradigm shift in fiber optic design by incorporating multiple cores within a standard cladding diameter, thereby significantly increasing the potential capacity per fiber. However, this innovative approach is not without its challenges. The integration of multiple cores within a confined diameter presents technical hurdles, most notably in the form of crosstalk; a phenomenon where light intended for one core interfere with light in adjacent cores, leading to signal degradation and reduced performance. To address these challenges and pave the way for the widespread adoption of MCFs, intensive research efforts are underway. A first aspect of our research involves the development of advanced numerical models based on established mode- and power- coupling theories. These models aim to accurately simulate and understand the complex interactions and signal propagation as a function of MCF design, with a particular focus on mitigating crosstalk effects. Additionally, in-depth characterization studies are carried out, especially on MCFs manufactured by our industrial partner, Prysmian Group, in the context of the joint laboratory LIFT. These MCFs feature a square arrangement of four standard SMF-type cores in conventionnal cladding dimensions, representing cutting-edge design with high potential for next-generation communication networks. Despite the promising advances in MCF technology, a significant barrier to its widespread adoption lies in interoperability with existing telecommunications infrastructure, which primarily rely on SMFs. To overcome this issue, we are actively working on the development of innovative multiplexing systems, so-called Fan-In/Fan- Out (FIFO) devices. These systems aim to seamlessly integrate the flow of information between SMFs and MCFs, thus enabling a smooth transition to more efficient and higher-capacity communication networks.

Doctorant : DEDUYTSCHAEVER Martin

Directeur de thèse : BIGOT Laurent, QUIQUEMPOIS Yves