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首页> 外文期刊>Journal of Optics >Laser diode to circular core graded index single mode fiber excitation via quadric interface microlens on the fiber tip and identification of the suitable refractive index profile for maximum coupling efficiency with optimization of structure parameter
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Laser diode to circular core graded index single mode fiber excitation via quadric interface microlens on the fiber tip and identification of the suitable refractive index profile for maximum coupling efficiency with optimization of structure parameter

机译：激光二极管通过光纤尖端上的二次界面微透镜对圆形纤芯渐变折射率单模光纤进行激发，并确定合适的折射率分布，以实现最大耦合效率并优化结构参数

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摘要

We report what to our knowledge is the first theoretical prediction of the optimum coupling efficiency of a laser diode emitting two wavelengths either 1.3 or 1.5 µm to a series of circular core graded index single mode fibers with different profile exponents via quadric interface microlens of four different focal lengths on the fiber tip to predict the nature of suitable refractive index profile. Instead of considering special ABCD matrix for individual microlens like hyperbolic, parabolic and elliptical (hemispherical included) one, a simple, accurate, and popular unified transfer ABCD matrix for refraction of quadric microlens under paraxial approximation is utilized to analyze the theoretical coupling efficiency, based on Gaussian beam approximation. Further, it is observed that out of the studied refractive index profiles, the step index profile comes out to be the most suitable profile to couple laser diode to circular core graded index single mode fiber for both wavelengths of practical interest. Moreover, the coupling efficiency can reach nearly 100 % with optimizing structure parameters of specific lensed fiber in both cases. The analysis should find use in ongoing investigations for optimum launch optics for the design of quadric interface microlens either directly on the circular core graded index single mode fiber tip or such fiber attached to single mode fiber.
机译：我们报告所掌握的知识是通过四个不同的二次界面微透镜将发射1.3或1.5μm两个波长的激光二极管与一系列具有不同轮廓指数的圆形纤芯渐变折射率单模光纤的最佳耦合效率的首次理论预测光纤尖端的焦距可以预测合适的折射率分布的性质。与其考虑为双微透镜，抛物线和椭圆形（包括半球形）的单个微透镜考虑特殊的ABCD矩阵，不如使用一种简单，准确且流行的统一转移ABCD矩阵，用于在近轴近似下折射二次微透镜来分析理论耦合效率，基于基于高斯光束近似。此外，可以观察到，在研究的折射率分布图中，对于实际感兴趣的两个波长，阶跃折射率分布是将激光二极管耦合到圆芯渐变折射率单模光纤的最合适的分布。此外，在两种情况下，通过优化特定透镜光纤的结构参数，耦合效率均可达到近100％。该分析应在正在进行的研究中找到最佳发射光学器件的设计，以用于二次曲面微透镜的设计，可以直接在圆形纤芯渐变折射率单模光纤头上或与单模光纤相连的此类光纤上。

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