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三维脊型光波导模斑转换器的设计和优化 总被引:3,自引:2,他引:1
在三维有限差分束传播法对脊形光波导的结构参数分析和优化的基础上,对单模光纤和脊形光波导连接耦合用模斑转换器进行了深入的研究,重点分析了影响模斑转换器性能的各种因素,如侧面边界、长度、大端宽度和厚度,以及连接光纤和模斑转换器的过渡波导的有关参数.仿真结果表明,三维锥形光波导模斑转换器大端宽度和厚度在11.5~13.5μm和4.5~6.5μm之间,且长度为200~500μm时插入损耗可低达2dB,比二维锥形光波导模斑转换器的插入损耗约减小2dB,其对横向偏移的容差也远远高于二维锥形光波导模斑转换器,合理的使用非线性边界的模斑转换器可以获得比线性边界的模斑转换器更小的插入损耗;过渡波导的宽度、芯层厚度应和三维锥形光波导模斑转换器的大端宽度和厚度一致,且其长度为150μm左右时损耗较小;另外,此类模斑转换器在减小耦合损耗的同时,还可以有效的进行光波模式的转换. 相似文献
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Full-vectorial analysis of optical waveguides by the finite difference method based on polynomial interpolation 下载免费PDF全文
Based on the polynomial interpolation, a new finite difference (FD)
method in solving the full-vectorial guided-modes for step-index optical
waveguides is
proposed. The discontinuities of the normal components of the electric
field across abrupt dielectric interfaces are considered in the absence of
the limitations of scalar and semivectorial approximation, and the present
FD scheme can be applied to both uniform and non-uniform mesh grids. The
modal propagation constants and field distributions for buried rectangular
waveguides and optical rib waveguides are presented. The hybrid nature of
the vectorial modes is demonstrated and the singular behaviours of the minor
field components in the corners are observed. Moreover, solutions are in good
agreement with those published early, which tests the validity of the
present approach. 相似文献
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