Condition for realizing single-mode operation and energy distribution characteristics in far-field of annular core fibers
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摘要: 基于弱波导近似，通过数值计算得出了环状光纤保持单模状态时对芯-包层折射率差值和导光层厚度的要求，同时讨论了这些设计参数对远场能量分布的影响。计算结果表明:当环状光纤工作在单模状态时，从光纤出射的环形光束衍射至远场时形成一个中央亮斑，具有很高的能量集中度。此外，减小芯-包层折射率差值与导光层厚度有利于进一步减小远场衍射的光斑宽度。Abstract: Based on the weak guidance approximation, the condition for realizing single mode operation of annular core fiber (ACF) and the energy distribution in far-field are discussed. The theoretical results demonstrate that when an ACF realizes single-mode operation, the annular beam emitted from the end of ACF diffracts to a central circular area in the far-field with good energy focusability. Besides, the beam width gets smaller when the thickness of the guiding section and the refractive index difference between the cladding and fiber core are reduced.
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Key words:
- annular core fibers /
- single mode /
- far field /
- energy distribution
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