光子学报, 2015, 44 (8): 0806004, 网络出版: 2015-09-08
光子晶体光纤长周期光栅栅区塌陷程度的理论研究
Theoretical Study of Depths of Cladding Collapse of PCF-LPGs
局域耦合模理论 光子晶体光纤 长周期光纤光栅 耦合模理论 有效折射率 塌陷程度 Local coupled-mode theory Photonic crystal fiber Long period grating Coupled mode theory Infective refractive index Depths of cladding collapse
摘要
采用局域耦合模理论对一种光子晶体光纤长周期光栅的耦合机理和特性进行了研究.建立了栅区模型,用局域耦合模理论和传统的耦合模理论模拟出LP01和LP02、LP01和LP11耦合的透射谱,并进行比较.从理论上分析局域耦合模理论对光子晶体光纤长周期光栅的适用性,研究了栅格个数、栅格周期和光栅栅区对透射谱的影响.模拟结果表明:随着栅格周期的增大,谐振波长向短波方向移动;随着栅格个数的增加,透射峰深度增加;随着栅区塌陷深度的增加,谐振波长向长波方向移动.
Abstract
A kind of Photonic Crystal Fiber based Long Periond Grating (PCF-LPG) was analyzed on basis of the local coupled-mode theory.Transmission spectrum of the coupling between LP01and LP02,LP01and LP11,was numerically modeled after building the collapse model.Compared with transmission spectrum calculated with the coupled mode theory,the local coupled-mode theory was found in a good agreement to analyze the strong PCF-LPGs.The changes of resonant wavelength were discussed in different grating periods,number of periods and the depths of cladding collapse.The results indicate that,with the increase of grating period,the resonance wavelength shifts to shorter wavelength;with the increase of number of periods,the resonance depth increases;with the increase of depths of cladding,the resonance wavelength shifts to longer wavelength.
段睿智, 赵春柳, 周雨萌, 龚华平. 光子晶体光纤长周期光栅栅区塌陷程度的理论研究[J]. 光子学报, 2015, 44(8): 0806004. DUAN Rui-zhi, ZHAO Chun-liu, ZHOU Yu-meng, GONG Hua-ping. Theoretical Study of Depths of Cladding Collapse of PCF-LPGs[J]. ACTA PHOTONICA SINICA, 2015, 44(8): 0806004.