Design of high purity vortex generator based on dual-core fiber coupler

Citation

Wang, Qiaobo, Chang, Min, Liu, Xuejing, & Zhou, Jun. (2022). 基于双芯光纤耦合器的高纯度涡旋光产生研究 [Design of high purity vortex generator based on dual-core fiber coupler]. 光学仪器 (Optical Instruments), 44(2), 43-50. https://doi.org/10.3969/j.issn.1005-5630.2022.02.007

Keywords

• Orbital Angular Momentum (OAM) Mode
• Fiber Coupler
• Dual-core Fiber Coupler
• Ring-core Fiber
• Single-mode Fiber (SMF)
• Mode Matching Method
• Phase Matching
• Vortex Light
• Coupling Efficiency
• Inter-mode Crosstalk
• Waveguide Separation (Core Spacing)
• High Purity Vortex Generator

Brief

This article presents the design and simulation of a dual-core fiber coupler composed of a standard single-mode fiber and a ring-core fiber to generate high-purity orbital angular momentum (OAM) modes by controlling the waveguide separation.

Summary

This article presents a dual-core fiber coupler design using a standard single-mode fiber and a ring-core fiber to generate high-purity orbital angular momentum (OAM) modes. By simulating the coupling process based on mode and phase matching and optimizing the waveguide separation, the authors achieved high coupling efficiency (up to 99%) and low inter-mode crosstalk (<-20 dB) for the first-order OAM mode, demonstrating a promising approach for all-fiber OAM generation systems.

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