Ultra-flattened chromatic dispersion and highly nonlinear photonic crystal fibers with ultralow confinement loss employing hybrid cladding

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• 作者：Jianfei Liao ; Junqiang Sun ; Yi Qin ; Mingdi Du
• 关键词：Photonic crystal fibers ; Dispersion flattened ; Fiber nonlinearity ; Confinement loss
• 刊名：Optical Fiber Technology
• 出版年：2013
• 出版时间：October, 2013
• 年：2013
• 卷：19
• 期：5
• 页码：468-475
• 全文大小：786 K

文摘

In this paper, two new types of dispersion-flattened photonic crystal fibers (DF-PCFs) with highly nonlinear and ultralow confinement loss are proposed. These new PCF structures adopt hybrid cladding with different air-holes diameters, pitches and air-holes arranged fashions. In order to analyze the proposed PCFs, the full-vector finite element method with anisotropic perfectly matched layers has been used. Results show that the ultra-flattened dispersion of 0.931 ps/(nm km) (DF-PCF1) and 1.533 ps/(nm km) (DF-PCF2) can be achieved in the wavelength range from 1.3 to 1.6 ¦Ìm with confinement losses lower than 0.001 dB/km in the same wavelength range. Meanwhile, the nonlinear coefficients of our proposed PCFs are greater than 23.83 W^?1 km^?1 (DF-PCF1) and 29.65 W^?1 km^?1 (DF-PCF2) at the wavelength of 1.55 ¦Ìm, and two near-zero dispersion values of 0.328 ps/(nm km) (DF-PCF1) and ?0.015 ps/(nm km) (DF-PCF2) can also be obtained at the same wavelength. Furthermore, the influence of manufacturing imperfections of parameters on dispersion and nonlinearity is discussed to verify the robustness of our design.