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Direct observation of multimode interference in rare-earth doped micro/nanofibers

Direct observation of multimode interference in rare-earth doped micro/nanofibers
Direct observation of multimode interference in rare-earth doped micro/nanofibers
Modal inspection of optical fibers is important for multimode application but it is
challenging to collect in-situ information of propagating modes for evaluation and manipulation. Here we demonstrate direct observation of multimode interference in Er3+/Yb3+co-doped micro/nanofibers. Luminescent interference patterns are visualized by visible up-conversion of Er3+ ions and are used for establishing the existence of higher order modes co-propagating with fundamental modes. We use fast Fourier transform to analyze the patterns in detail and obtain excellent agreement between experiment and calculation on beat lengths of the interference. Effective index differences among higher order modes and a fundamental mode of a microfiber are also experimentally investigated with the assistance of interference patterns, revealing the characteristic of modal dispersions.
1094-4087
26728-26737
Chen, Bigeng
e533448b-095e-4a9f-924c-301f4aa3007b
Bao, Qingyang
c1e02c7c-0e07-4cdb-ad2e-447035e3848c
Tong, Limin
cef24833-b3c2-40f7-8c24-d64018fe9331
Chen, Bigeng
e533448b-095e-4a9f-924c-301f4aa3007b
Bao, Qingyang
c1e02c7c-0e07-4cdb-ad2e-447035e3848c
Tong, Limin
cef24833-b3c2-40f7-8c24-d64018fe9331

Chen, Bigeng, Bao, Qingyang and Tong, Limin (2019) Direct observation of multimode interference in rare-earth doped micro/nanofibers. Optics Express, 27 (19), 26728-26737. (doi:10.1364/OE.27.026728).

Record type: Article

Abstract

Modal inspection of optical fibers is important for multimode application but it is
challenging to collect in-situ information of propagating modes for evaluation and manipulation. Here we demonstrate direct observation of multimode interference in Er3+/Yb3+co-doped micro/nanofibers. Luminescent interference patterns are visualized by visible up-conversion of Er3+ ions and are used for establishing the existence of higher order modes co-propagating with fundamental modes. We use fast Fourier transform to analyze the patterns in detail and obtain excellent agreement between experiment and calculation on beat lengths of the interference. Effective index differences among higher order modes and a fundamental mode of a microfiber are also experimentally investigated with the assistance of interference patterns, revealing the characteristic of modal dispersions.

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More information

Accepted/In Press date: 15 August 2019
e-pub ahead of print date: 9 September 2019
Published date: 16 September 2019

Identifiers

Local EPrints ID: 433997
URI: https://eprints.soton.ac.uk/id/eprint/433997
ISSN: 1094-4087
PURE UUID: c8818acd-89e0-4dce-a32c-56916c935790
ORCID for Bigeng Chen: ORCID iD orcid.org/0000-0003-4925-2308

Catalogue record

Date deposited: 10 Sep 2019 16:30
Last modified: 22 Oct 2019 00:28

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Contributors

Author: Bigeng Chen ORCID iD
Author: Qingyang Bao
Author: Limin Tong

University divisions

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