三平行光子晶体单模波导的耦合特性及其应用

将三光子晶体单模波导的相互耦合看成一个多模干涉系统.本征模的色散曲线相交或近于相交并出现简并模，简并模之间存在强烈耦合并导致模式的分布方式发生转变.多模干涉系统中，不同波长的光波能量在传输过程中由于相干而具有不同的空间输出行为，在近简并点处多模之间的相干解除，能流限制在原输入方向，不发生转移.三光子晶体单模光波导的这种特性可用来制作波分复用或解复用器件. 关键词： 光子晶体波导 简并模 多模干涉 波分复用或解复用

Coupling characteristics of electromagnetic waves in parallel three photonic crystal waveguides and its application

We consider the coupling between three photonic crystal waveguides as a multimode interference system and show that the dispersion curves of the eigenmodes intersect or almost intersect. Degenerate modes appear in the system. Due to the strong coupling between the degenerate modes, the modal patterns of the guided modes are changed obviously. We find that the power distribution of output light waves of different frequencies is different by selecting the coherence length. At the crossing point, the multimode interference is deprived and power is confined to its input direction without observable transferring to other photonic crystal waveguides. On the basis of these, a wavelength de-multiplexer or multiplexer is designed.