Mr. Lei Wang Profile

Lei Wang

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Proceedings Article | 9 October 2021 Presentation + Paper

All-fiber flat-top orbital angular momentum mode converter realized by a SMF-based helical grating with phase modulation

Chengliang Zhu, Lei Wang, Yong Zhao, Hongpu Li

Proceedings Volume 11902, 119020O (2021) https://doi.org/10.1117/12.2601169

KEYWORDS: Phase modulation, Single mode fibers, Wavelength division multiplexing

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An all-fiber flat-top orbital angular momentum (OAM) mode convertor with ultra-wideband is numerically demonstrated, which is based on a helical long period fiber grating (HLPG) with phase modulation. The proposed phase-modulated HLPG is formed in a single mode fiber (SMF) and works at dispersion turning point. A flat-top OAM mode convertor with a bandwidth of ∼371 nm and a conversion efficiency of ∼100% has been successfully obtained. The temperature and strain effects on the proposed OAM mode convertor have been also theoretically investigated, respectively. The results show that the proposed phase-modulated HLPG based flat-top OAM mode convertor has a certain resistance to external temperature and strain changes, which will be beneficial to reduce its packaging cost and difficulty. The proposed device may find potential applications in the OAM mode division multiplexing (MDM) system combined with the wavelength division multiplexing (WDM) technique.

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