论文部分内容阅读
利用有限元法和传输矩阵法,对柚子型结构的光子晶体光纤啁啾光栅的反射谱进行了理论分析。得到了啁啾光栅参数和光纤参数对光子晶体光纤啁啾光栅反射谱的影响规律。结果表明随着啁啾系数和折变量的增加,光栅反射谱呈规律变化,当啁啾系数增大到一定程度时几个反射峰会连到一起,形成一个大的反射带宽。光纤的内包层直径和纤芯直径的改变能够影响各反射峰之间的间距。同时研究了切趾变迹对光子晶体光纤啁啾光栅反射谱的影响,研究表明,所用切趾函数会同时对多个峰进行切趾,每个峰的切趾效果都很好。对反射谱波动较大的几个峰相连的啁啾光栅经过柯西切趾后反射谱曲线平滑,适合于实际应用。
Using the finite element method and the transfer matrix method, the reflection spectra of the grapefruit-type photonic crystal fiber chirped gratings are theoretically analyzed. The influence of chirped grating parameters and fiber parameters on the reflection spectra of chirped gratings of photonic crystal fibers is obtained. The results show that with the increase of the chirp coefficient and the amount of deflection, the grating reflection spectrum changes regularly. When the chirp coefficient increases to some extent, several reflection peaks will be connected together to form a large reflection bandwidth. The change in inner cladding diameter and core diameter of an optical fiber can affect the spacing between the various reflection peaks. The effect of apodization on the reflection spectra of photonic crystal fiber chirped gratings was also studied. The results show that the apodization function is used to apodize multiple peaks at the same time, and the apodization effect of each peak is good. Chirped gratings connected with several peaks with large reflection spectrum are smooth after the Cauchy apodization, which is suitable for practical application.