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首页> 外文期刊>Optical and quantum electronics >Optical and microwave analysis of mushroom-type waveguides for traveling wave electroabsorption modulators based on asymmetric intra-step-barrier coupled double strained quantum wells by full-vectorial method
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Optical and microwave analysis of mushroom-type waveguides for traveling wave electroabsorption modulators based on asymmetric intra-step-barrier coupled double strained quantum wells by full-vectorial method

机译：基于不对称步阶内耦合双应变量子阱的行波电吸收调制器蘑菇型波导的全矢量光学和微波分析

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摘要

The finite difference method is exploited for a full-vectorial analysis of mushroom-type waveguides for traveling wave electroabsorption modulators (TWEAM) based on asymmetric intra-step-barrier coupled double strained quantum wells (AICD-SQW). In this analysis, the discontinuities of the normal components of the electric field across abrupt dielectric interfaces which are known as the limitations of scalar and semivecto-rial approximation methods are considered. The optical field distributions in mushroom-type TWEAM based on AICD-SQW and conventional ridge-type TWEAM of the same active region for 1.55 μm operation are presented. The important parameters in the high-frequency TWEAM design such as optical effective index which defines optical velocity and transverse mode confinement factor are calculated. Then, the transmission line microwave properties (microwave index, microwave loss, and characteristic impedance) of TWEAMs are obtained. The modulation response of mushroom-type TWEAM is calculated using circuit model by considering interaction between microwave and optical fields in waveguide and compared with conventional ridge-type TWEAM. It is found that increasing the width of p-cladding layer with the same i-layer to reduce the resistance in p-i-n mushroom-type waveguide of TWEAM based on AICD-SQW can improve the microwave propagation loss and thus the high-speed electro-optical response.
机译：利用有限差分法对基于不对称步内势垒耦合双应变量子阱（AICD-SQW）的行波电吸收调制器（TWEAM）的蘑菇型波导进行全矢量分析。在此分析中，考虑了跨电介质界面的电场法向分量的不连续性，这种不连续性被称为标量和半矢量近似方法的局限性。给出了基于AICD-SQW的蘑菇型TWEAM和相同有源区域的传统脊型TWEAM在1.55μm操作下的光场分布。计算了高频TWEAM设计中的重要参数，例如定义光速和横向模式限制因子的光学有效指数。然后，获得TWEAM的传输线微波特性（微波指数，微波损耗和特性阻抗）。蘑菇型TWEAM的调制响应是使用电路模型通过考虑微波与波导中光场之间的相互作用而计算的，并与传统的脊型TWEAM进行比较。研究发现，以AICD-SQW为基础，增加具有相同i层的p覆盖层的宽度，以减小TWEAM的pin蘑菇型波导的电阻，可以改善微波传播损耗，从而改善高速电光响应。

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