High-order mode conversion in a few-mode fiber via laser-inscribed long-period gratings at 1.55  µm and 2  µm wavebands

We demonstrate high-order mode conversion in a few-mode fiber (FMF) via laser inscribed long-period fiber gratings (LPFGs) at both the 1.55 µm and 2 µm wavebands. At the 1.55 µm waveband, five high-order core modes (the , , , , and modes) can be coupled from the mode with high efficiency by the FMF-...

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Bibliographic Details
Published in:Applied optics (2004) 2020-12, Vol.59 (34), p.10688
Main Authors: Zhao, Xinyi, Zhao, Yunhe, Liu, Yunqi, Liu, Zuyao, Mou, Chengbo, Shen, Lei, Zhang, Lei, Luo, Jie
Format: Article
Language:English
Subjects:
Angular momentum
Broadband
Carbon dioxide
Carbon dioxide lasers
Conversion
Converters
Coupled modes
Fiber lasers
Gratings (spectra)
Multiplexing
Optical communication
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Summary:We demonstrate high-order mode conversion in a few-mode fiber (FMF) via laser inscribed long-period fiber gratings (LPFGs) at both the 1.55 µm and 2 µm wavebands. At the 1.55 µm waveband, five high-order core modes (the , , , , and modes) can be coupled from the mode with high efficiency by the FMF-LPFGs. The orbital angular momentum beams with different topological charges (±1,±2,±3) are experimentally generated by adjusting the polarization controllers. At the 2 µm waveband, three high-order modes (the , , and mode) can be coupled by the FMF-LPFGs with different grating periods. The proposed LPFG-based mode converters could have a potential prospects in mode-division multiplexing and multiwindow broadband optical communication applications.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.408782