摘要
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.
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.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第4期1851-1856,共6页
Acta Physica Sinica
基金
国家自然科学基金(批准号:60477018)
国家自然科学基金重点项目(批准号:60436020)资助的课题.
关键词
光子晶体波导
简并模
多模干涉
波分复用或解复用
photonic crystal waveguide, degenerate mode, muhimode interference, wavelength de-multiplexer or multiplexer
