渐变结构微谐振器光子晶体波导的优选设计

Optimum designs of micro-resonator photonic crystal waveguides with gradually varied formations

为获取高品质的单通帯波长信道,设计了三种类型的渐变结构微谐振器光子晶体波导,用FDTD方法研究了这些结构的功率传输谱,并采集功率谱通帯参数对比分析了其输出性能。随微谐振器中心柱半径的增大,每支波导输出端单通帯传输模式表现为从短波向长波三次规律的周期性变化。波导结构选择及其参数的优化有助于输出性能的改善,在开发更多单通帯波长信道上都具有潜在能力。结果表明,优化后的结构拥有高品质的单通带波长传输特性,如:规律性周期变化模式、利于信号增强设计、稳定传输性能、优良宽带适应能力。该类波导可根据所需波长灵活选择最佳类型结构设计,在密集型光通信系统,光路集成,紧凑型光传感接口等设计中具有应用价值。

In order to design high quality single pass-band wavelength channels,three types of micro-resonator photonic crystal waveguides with gradually varied formations are designed.Power transmission spectra of these waveguides are studied by using FDTD(Finite-Difference Time-Domain)method.The output performances of these structures are compared and analyzed by collecting the pass-bands parameters of power spectra.As the central rod radius value of the micro-resonator increases,single pass-band transmission patterns of every waveguide output show the law of three times regular periodic variations from the short wavelength to the long wavelength.Optimization of structural choices and structural parameter designs have favourable effects on the output performances,so all of these waveguides have promising potentials to develop more single pass-band wavelength channels.The results show that the optimized structures can possess high quality of single pass-band wavelength transmission characteristics,such as regular periodic variation patterns,favorable signal enhancement designs,stable transmission performances,excellent adaptability of broad bandwidth.The best type of the structural designs can be flexibly selected according to the required wavelength,and these waveguides have application values in the designs of dense optical communication system,integrated optical path,compact optical sensing interface etc.