【摘要】 应用平面波法分析了带隙效应导引光子晶体光纤(Photonicbandgapguidingfibers,PBG PCFs)中实现空气通道导光必须满足的条件,计算机仿真了蜂窝和三角形两种不同结构的PBG PCFs的空气导光性能。计算结果表明,要实现空气导光,空气孔直径与周期的比值d/Λ必须大于某一特定值:对于蜂窝结构该比值为0.84,而对于三角形结构该比值为0.59;在特定的d/Λ下,空气导光的波长范围随Λ可变。更多还原

【Abstract】 According to the Maxell`s equations and the theory of optical waveguide, we discussed the requisites of air-guiding of light in the photonic bandgap guiding fibers(PBG-PCFs). Using a Matlab program which bases on the plane waves expansion method(PWM), we caculated the photonic crystal bandgap(PBG) diagrams of photonic crystal fibers(PCFs) with homeycomb and triangular structures. Then we compared the porperities of air-guiding of the two different structures. We concluded that in order to guide light in the air-core of the PBG-FCFs the ratio d/Λ should be larger than some specific values related to the structure of the fibers. And we also see that triangular structure PBG-PCFs are easier to guide light in the air-core, and the range of the wavelength that can be guided in the air-core can be adjusted by the Λ value. PBG-PCFs that can guide light in the air-core are expected to have much lower dispersion,losses and nonlinearity than conventional fibers, which is attractive to optical fiber communication.更多还原