We demonstrate the fabrication of long-period fiber gratings (LPFGs) by using focused carbon dioxide laser. The mode coupling and characteristics of the LPFGs written in the few mode fibers were investigated experimentally. The generation and conversion of the orbital angular momentum (OAM) modes were achieved by the special designed gratings. The LPFGs could have promising application as high sensitivity optical sensors and all fiber mode converters.
Yunqi Liu, "Highly sensitive optical sensors based on the coupling of high-order core modes," Proc. SPIE 11555, Real-time Photonic Measurements, Data Management, and Processing V, 1155507 (Presented at SPIE/COS Photonics Asia: October 12, 2020; Published: 10 October 2020); https://doi.org/10.1117/12.2574066.6196126337001.
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