研究目的
Investigating the bending-induced deterioration of orbital angular momentum (OAM) modes in ring core ?ber (RCF), photonic crystal ?ber (PCF), and vortex ?ber (VF).
研究成果
The PCF is most robust to bending among the three types of optical fibers, with the VF and RCF showing significant degradation of the topological charge number at bending radii smaller than ~15 and ~45 mm, respectively. The methodology and results are expected to be useful in the design of OAM mode fibers for practical use.
研究不足
The study is limited to theoretical analysis and numerical simulations. Practical implementation and experimental validation are not covered.
1：Experimental Design and Method Selection:
Theoretical investigation using a commercial ?nite difference method (FDM)-based software (Lumerical Bent Waveguide Solver).
2：Sample Selection and Data Sources:
Three types of optical ?bers (VF, RCF, and PCF) with specific structures adopted from the literature.
3：List of Experimental Equipment and Materials:
Lumerical Bent Waveguide Solver software.
4：Experimental Procedures and Operational Workflow:
Modal analysis of OAM modes in bent and straight optical fibers, calculation of bending losses, coupling losses, and intermodal crosstalk.
5：Data Analysis Methods:
Calculation of topological charge numbers from field profiles to assess OAM mode purity.
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