单模腔构成连续波的低串扰交叉
Low crosstalk intersections of CCWs composed by mono-mode cavities
摘要：
研究了二维光子晶体结构中由\textit{mono-mode}腔构成的两个交叉耦合腔波导的低串扰交叉问题。虽然单个腔是\textit{mono-mode}，但适当设计的CCW（在本文中称为\textit{supermodes}）的模式可以是偶极型的，并且沿着另一个垂直CCW的轴反对称，这确保了交叉点的低串扰。根据耦合模分析的结果，根据每个CCW的腔数将交叉点分为两类，并采用时域有限差分法（FDTD）数值计算了这两类交叉点的透射谱和串扰谱。测试结果表明，串扰功率小于-30dB。我们还讨论了影响交叉口性能的因素。
英文摘要：
Low crosstalk intersections formed by two crossing coupled cavity waveguides (CCWs), which are formed by series of \textit{mono-mode} cavities in a two dimensional photonic crystal structure, are investigated. Although the individual cavities are \textit{mono-mode}, the modes of the properly designed CCWs (which are called \textit{supermodes} in this paper) may be dipole-like, and antisymmetry along the axis of the other perpendicular CCW, which ensures the low crosstalk of the intersections. According to the results of coupled mode analysis, we divide the intersections into two kinds based on the number of cavities of each CCW, and the transmission and crosstalk spectra of both kinds are numerically obtained using finite difference time domain (FDTD) method. The results show that crosstalk power is lower than -30dB. We also discuss the factors that affect the performance of the intersections.
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