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Title: Towards hollow-core fiber polarization beam splitting and combining
Authors: Raynal, Guillaume Dorian Louis
Keywords: Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics
Engineering::Electrical and electronic engineering::Antennas, wave guides, microwaves, radar, radio
Issue Date: 2023
Publisher: Nanyang Technological University
Source: Raynal, G. D. L. (2023). Towards hollow-core fiber polarization beam splitting and combining. Doctoral thesis, Nanyang Technological University, Singapore.
Abstract: Inhibited Coupling fibers (ICFs) are a new kind of hollow core fibers. During the last decade, researchers have improved the performance of these fibers and low loss over broad transmission windows has now been achieved. This makes ICFs serious candidates for applications in high power and ultrashort beam delivery, motion sensors, and telecommunications. One of the major shortfalls in the wide implementation of ICFs in many of these applications is the general difficulties in integrating the hollow core fiberized devices. Fiber couplers are one of the most crucial components in achieving the system integration, as they are the most fundamental fiber element for beam splitting and combining. Multicore ICFs are highly promising for such applications. This PhD dissertation addresses the influence of the geometry on the coupling properties of a multicore ICF coupler. The coupling properties of an asymmetrical structure and the coupler sensitivity to bending are investigated. Triple core ICF designs that can be easily fabricated are proposed and numerically analyzed. ICF stack-and-draw process is introduced, optimized, and applied to the fabrication of the triple core ICF design. The fibers’ coupling spectral dependence was characterized, and high coupling efficiency is observed for the first time between the three cores. Besides, large polarization extinction ratios could be achieved, enabling the first demonstration of polarization beam splitting in multicore ICF and a significant advancement towards fiber polarization beam combining.
DOI: 10.32657/10356/171837
Schools: School of Electrical and Electronic Engineering 
Research Centres: CNRS International NTU THALES Research Alliances 
Centre for Optical Fibre Technology 
Rights: This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Theses

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