Journal
OPTICS LETTERS
Volume 47, Issue 16, Pages 4016-4019Publisher
Optica Publishing Group
DOI: 10.1364/OL.468259
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Funding
- National Key Research and Development Program of China [2018YFB1801800]
- National Natural Science Foundation of China [61935002, 61975113]
- Shanghai Professional Technical Public Service Platform of Advanced Optical Waveguide Intelligent Manufacturing and Testing [19DZ2294000]
- 111 Project [D20031]
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We propose a method for selectively generating high-order orbital angular momentum (OAM) modes using a twisted ring-core fiber (RCF). Experimental results demonstrate the excitation of OAM modes up to the fourth order, indicating that the twist direction can control the helical phase of the modes. Compared with other methods, this approach has the advantages of low loss, high mode purity, and simple fabrication.
We propose a method for the selective generation of high-order orbital angular momentum (OAM) modes by twisting a ring-core fiber (RCF). Theoretically, 22 OAM modes can be generated in the twisted RCF with effective mode separation. We experimentally demonstrate the excitation of OAM modes up to the fourth order. The positive or negative topological charge is determined by the clockwise or counter-clockwise twist direction, indicating that the helical phase of the OAM can be controlled by the twist orientation. Compared with other fiber-based methods, the high-order OAM modes generated by our approach have the characteristics of low loss (minimum 0.3 dB), high mode purity (maximum 98%), and simple fabrication. This has potential applications in high-resolution imaging, high-capacity fiber-optics communication, vortex-optics sensing, and other fields. (C) 2022 Optica Publishing Group
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