Ma, Yuehui, Zhou, Kaiming, Kamarudin, Lukman, Jiang, Chen, Chen, Siyu, Li, Jiaxuan, Huang, Qiushi, Sun, Wei, Wang, Xutao, Yang, Zhiqun, Liu, Yaping, Zhang, Lin, Mou, Chengbo and Liu, Yunqi (2024). Mode conversion in graded-index few-mode fiber via hollow cylindrical long-period fiber gratings. Optics Letters, 49 (20),
Abstract
We demonstrate the realization of mode conversion using hollow cylindrical long-period fiber gratings (LPFGs) inscribed in graded-index few-mode fibers (FMFs) by a femtosecond laser. By precisely shaping the refractive index modulation into a hollow cylindrical structure, we enable efficient coupling from the fundamental mode to high-order modes (LP11, LP02, LP21, LP12, LP31, LP03, and LP22 modes). The method achieves high-efficiency and low-loss mode conversion across various mode groups, marking a first for graded-index FMFs with different grating periods. The influence of the hollow cylindrical LPFG radius on mode conversion efficiency and spectral characteristics is thoroughly investigated. Additionally, incorporating a linear polarizer allowed for distinguishing between LP modes within a mode group, enhancing the tunability of the mode converter. These mode conversion devices have significant potential for applications in mode gain equalization and mode scrambling for mode division multiplexing (MDM) systems.
| Publication DOI: | https://doi.org/10.1364/ol.538511 |
|---|---|
| Divisions: | College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT) College of Engineering & Physical Sciences |
| Additional Information: | Copyright © 2024 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved. This paper was published in Optics Letters and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: https://doi.org/10.1364/OL.538511. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law. |
| Publication ISSN: | 1539-4794 |
| Last Modified: | 12 Nov 2024 15:14 |
| Date Deposited: | 12 Nov 2024 15:14 |
| Full Text Link: | |
| Related URLs: |
https://opg.opt ... -5949&id=561434
(Publisher URL) |
PURE Output Type: | Article |
| Published Date: | 2024-10-15 |
| Published Online Date: | 2024-10-14 |
| Accepted Date: | 2024-09-30 |
| Authors: |
Ma, Yuehui
Zhou, Kaiming ( 
0000-0002-6011-1912)
Kamarudin, Lukman Jiang, Chen Chen, Siyu Li, Jiaxuan Huang, Qiushi Sun, Wei Wang, Xutao Yang, Zhiqun Liu, Yaping Zhang, Lin (
0000-0002-1691-5577)
Mou, Chengbo Liu, Yunqi |
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