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Air-holes induced multimodal fiber design to increase the effective index difference between higher order guided modes

Gulistan, A., Ghosh, S. ORCID: 0000-0002-1992-2289, Chugh, S. and Rahman, B. M. ORCID: 0000-0001-6384-0961 (2019). Air-holes induced multimodal fiber design to increase the effective index difference between higher order guided modes. Optical Fiber Technology, 53, 102023.. doi: 10.1016/j.yofte.2019.102023

Abstract

A novel technique is proposed to increase the effective index difference (△neff) between higher order modes of a multimode step-index fiber. Multimode fibers provide a higher effective area and their higher order modes are also resistant to area reduction due to bending. However, the larger effective area comes with an increased number of modes which are more prone to mode coupling and mode mixing. The modal stability is directly related to the effective index difference between the mode of propagation and its neighboring modes. We have shown here that the modal stability between LP06 mode and its neighboring antisymmetric LP15 and LP16 modes can be increased more than 54% by the introduction of air-holes array along the circumference of the fiber. We have also shown variation in the effective index difference with possible fabrication tolerances that may occur in air-holes size and change in their locations. Furthermore, the technique presented here can also be applied to increase the stability of other higher modes of a multimode fiber.

Publication Type: Article
Additional Information: © Elsevier 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Publisher Keywords: Multimode fibre, Mode stability, Higher order modes, Effective index difference
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments: School of Mathematics, Computer Science & Engineering > Engineering > Electrical & Electronic Engineering
URI: http://openaccess.city.ac.uk/id/eprint/23010
[img] Text - Accepted Version
This document is not freely accessible until 10 October 2020 due to copyright restrictions.
Available under License Creative Commons Attribution Non-commercial No Derivatives.

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