研究目的
Investigating the generation of stable orbital angular momentum (OAM) modes with topological charges of ±1 using an all-fiber laser system for potential applications in optical communication systems.
研究成果
The all-fiber laser system successfully generates stable OAM modes with high purity (94.41%) and demonstrates potential for integration into optical communication systems. The use of ring-core fibers and gratings ensures stable mode propagation and selection.
研究不足
The study focuses on OAM modes with topological charges of ±1. The generation of higher-order OAM modes and the scalability of the system for multiplexing applications are not extensively explored.
1：Experimental Design and Method Selection:
The study employs an all-fiber laser system incorporating a ring-core fiber to generate OAM modes. A long-period fiber grating (LPFG) and a fiber Bragg grating (FBG) are used for mode selection.
2：Sample Selection and Data Sources:
The ring-core fiber is designed in-house to support stable OAM mode propagation.
3：List of Experimental Equipment and Materials:
The setup includes a 980 nm laser diode, wavelength division multiplexer (WDM), ytterbium-doped fiber (YDF), LPFG, FBG, and a non-polarizing beam splitter (NPBS) for interference pattern observation.
4：Experimental Procedures and Operational Workflow:
The laser output is characterized by measuring the coupling ratio, mode purity, and stability of the OAM modes.
5：Data Analysis Methods:
The purity of the OAM mode is analyzed using azimuthal Fourier series decomposition from intensity patterns.
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