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Vectorial finite element analysis of vertical coupling between D-fiber and buried optical channel waveguide

机译：D光纤与掩埋光通道波导垂直耦合的矢量有限元分析

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摘要

Light coupling to planar guided-wave optical circuits by means of directional coupling between D-fiber and buried square waveguide is indicated as a viable means of reducing alignment tolerances in fiber-pigtailing procedure of integrated optical devices. The geometry studied consists of a circular core fiber vertically coupled to a buried square waveguide. An accurate analysis by a vectorial formulation of the finite element method is presented. The structure is analyzed for generic cladding and core configurations. The dependence of power transfer efficiency from waveguide size and refractive index is investigated. The influence of the vertical separation between D-fiber and square waveguide on the overall coupled power is also analyzed. It is shown that because of mode mismatch at the input and output sections of the coupler between the field distributions of isolated guides and coupled guides, the power transfer is limited by radiation losses. By appropriately sizing the coupler and by choosing suitable refractive index values, the power transfer efficiency from the D-fiber to the square waveguide can approach 100%.
机译：通过D光纤和埋入式方形波导之间的定向耦合将光耦合到平面导波光学电路被指示为减小集成光学装置的光纤尾纤过程中的对准公差的可行手段。研究的几何形状由垂直耦合到埋入式方形波导的圆形芯光纤组成。通过有限元方法的矢量公式给出了准确的分析结果。分析该结构的通用包层和纤芯配置。研究了功率传输效率与波导尺寸和折射率的关系。还分析了D光纤和方波导管之间的垂直间隔对总耦合功率的影响。结果表明，由于耦合器的输入和输出部分的模式不匹配，在隔离的波导和耦合的波导的场分布之间，功率传输受到辐射损耗的限制。通过适当地确定耦合器的大小并选择合适的折射率值，从D光纤到方波导管的功率传输效率可以达到100％。

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