Discrete self-imaging in small-core optical fiber interferometers

Lian, Xiaokang, Wu, Qiang, Farrell, Gerald, Changyu, Shen, Ma, Youqiao and Semenova, Yuliya (2019) Discrete self-imaging in small-core optical fiber interferometers. Journal of Lightwave Technology, 37 (9). pp. 1873-1884. ISSN 0733-8724

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Official URL: https://doi.org/10.1109/JLT.2019.2894365


Multiple cladding modes can exist in a small-core optical fiber unaccompanied by core modes, yet this fact has not been sufficiently explored in literature to date. In this article, we study the self-imaging of cladding modes in small core optical fiber interferometers. Our analytical and numerical simulations and experiments show that unlike the self-imaging of core modes, self-imaging of cladding modes only appears at a set of discrete positions along the interferometer axis with an equal spacing corresponding to some discrete values of fiber core radius. This is the first observation of the discrete self-imaging effect in multimode waveguides. More strikingly, the self-imaging period of cladding modes grows exponentially with fiber core radius, unlike the quadratic relationship in the case of core modes. The findings bring new insights to the mode propagation in an optical fiber with a core at micro/nanoscale, which may open new avenues for exploring multimode fiber technologies in both linear and nonlinear optics.

Item Type: Article
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Paul Burns
Date Deposited: 23 Jan 2019 10:15
Last Modified: 06 Apr 2023 15:00
URI: https://nrl.northumbria.ac.uk/id/eprint/37694

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