摘要
利用有限元法分析了包层结构为圆形空气孔呈正方形对称排列的光子晶体光纤(PCF)的有效传输模式,并仿真解析出各波长下有效传输模的有效折射率及变化规律。结合模耦合理论和传输矩阵法,对基于PCF的Bragg光栅(PCFBG)的反射谱特性进行了仿真和分析,并对比了PCF包层不同占空比下的PCFBG反射谱。选择高斯函数对各反射谱进行切趾优化。理论计算和仿真结果证明,各模式有效折射率随着波长的增加而近似线性降低,不同占空比的PCFBG反射谱之间的差异较为明显。在此基础上,可进一步研究正方形包层结构的PCFBG的调谐特性,并应用于可调谐的多通道OADM。
The effective transmission modes of photonic crystal fiber structured with square symmetry hole cladding were analyzed by the finite element method, and the effective indexes of the modes under different wavelengths were simulated. The reflection spectra of this photonic crystal fiber grating （PCFBG） were computed and simulated by coupled-mode method and transmission matrix method. Moreover, the differences of the reflection spectra were compared with different diameter-to-pitch ratio. Optimized reflectance spectrum was apodized by Gaussian function. Theoretical calculations and simulation results show that the refractive index of every mode declines linearly approximate as wavelength rising, and the reflection spectrum of the photonic crystal fiber grating lies on the diameter-to-pitch of cladding structure. On this basis, the tuning characteristics of PCFBG structured with square symmetry hole cladding need to be further studied and applied to tunable multi-channel OADM.
出处
《半导体光电》
CAS
CSCD
北大核心
2013年第4期658-662,共5页
Semiconductor Optoelectronics
基金
南京邮电大学引进人才项目(NY207140)
关键词
光子晶体光纤光栅
反射谱
耦合模理论
传输矩阵法
切趾
photonic crystal fiber grating
reflecting spectra
coupled-mode theory
transmission matrix method
apodization
