Femtosecond laser inscribed parallel long-period fiber gratings for multi-channel core mode conversion


We propose and demonstrate the inscription of parallel long-period gratings (LPGs) in a few-mode fiber (FMF) using femtosecond lasers. Mode conversion from the fundamental (LP01) mode to high-order core modes, including LP11, LP21, LP31, LP02, and LP12, is achieved by controlling the inscription period of the gratings. Taking advantage of the highly focused femtosecond laser, LPGs with different off-axis offsets were fabricated, and the resonance wavelength and the inscription efficiency of the gratings versus the offset were investigated. Based on the off-axis writing technique and using the femtosecond laser source, we wrote parallel LPGs that contain multi-gratings in a single FMF and achieved a multi-channel core mode converter in a single FMF with flexibility in terms of the resonant wavelength and mode conversion among different modes. This approach offers a new, to the best of our knowledge, option for implementation with high integration, and a multi-channel mode converter, which could find potential applications in FMF multi-wavelength laser systems, and wavelength/mode division multiplex communication systems. Furthermore, these microstructured LPGs integrated into an optical fiber can be used as a multifunctional sensor.

Publication DOI: https://doi.org/10.1364/ol.461547
Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
Additional Information: © 2022 Optica Publishing Group. 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.461547. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
Uncontrolled Keywords: Atomic and Molecular Physics, and Optics
Publication ISSN: 1539-4794
Last Modified: 19 Jun 2024 17:06
Date Deposited: 28 Jul 2022 12:18
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Related URLs: https://opg.opt ... i=ol-47-13-3207 (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2022-07-01
Published Online Date: 2022-06-22
Accepted Date: 2022-06-06
Authors: Jiang, Chen
Zhou, Kaiming (ORCID Profile 0000-0002-6011-1912)
Sun, Bing
Wang, Zhiqiang
Wan, Ying
Ma, Yuehui
Mou, Chengbo
Shen, Lei
Zhang, Lei
Luo, Jie
Liu, Yunqi



Version: Accepted Version

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