基于光子晶体方形谐振器的可调谐光信号分离器

摘要

Optical signal splitter was optimized by adjusting the coupling length,coupling width,coupling rod radius between PCSR and waveguide in the two-dimensional photonic crystal structure.As the interactions between PCSRs were considered,electromagnetic wave coupling performances between waveguide and cavity in the structure were analyzed qualitatively by using coupled-mode theory.The transmission characteristics of the two output ports were studied by the FDTD method.It shows that the optical signal splitter based on PCSRs has the characteristics of high normalized transmission ratios,narrow bandwidth,stable signal transmission intensity,broadly tunable ranges of central wavelength in the ranges of design parameters.This structure can separate transmission signal power into two equal parts at the same central wavelength,and it can also separate signals of different central wavelengths.The micro optical signal splitter promises a potential building block of photonic circuits on chip.It is suitable for the designs of wavelength division demultiplexing optical communication systems and photonic integrated circuits etc.%在二维光子晶体结构中通过调节光子晶体方形谐振器PCSRs(Photonic Crystal Square Resonators)与波导的耦合长度、耦合宽度、及其耦合柱半径优化设计了光信号分离器.借助于CMT(Coupled-Mode Theory)理论定性分析了两个PCSRs存在相互作用时,结构中波导与谐振腔之间的电磁波耦合性能,用FDTD方法研究了两信道传输工作特性.表明在设计的参数范围中,基于PCSRs的信号分离器具有高正规化传输率、窄带宽、平稳的信号传输强度,中心波长调谐范围宽的特性.该类结构可用于同一中心波长信号的功率二等均分,也可用于不同中心波长信号的分离.该微型结构在片上的光路设计将是一类有潜力的构筑模块,适于光通信领域波分解复用设计、光路集成设计等方面.