光学学报, 2010, 30 (s1): s100203, 网络出版: 2010-12-08  

低色散高非线性四波混频用光子晶体光纤的优化设计

Design and Optimization of Low-Dispersion High-Nonlinear Photonic Crystal Fiber for Four-Wave Mixing
张亚妮 1,2,*
作者单位
1 宝鸡文理学院物理与信息技术系, 陕西 宝鸡 721007
2 中国科学院西安光学精密机械研究所 瞬态光学与光子技术国家重点实验室, 陕西 西安 710119
摘要
优化设计了一种四波混频用低色散高非线性光子晶体光纤,该光纤纤芯缺失一根空气柱,包层沿光纤长度方向排布为压缩六角点阵椭圆空气孔。采用全矢量有限元法, 对其色散和非线性系数进行了数值模拟。结果发现,通过优化调整光纤结构参数,即改变六角点阵压缩比ξ、相对孔间隔f和空气孔椭圆率η, 该光纤从波长1.43 μm到1.80 μm接近370 nm波段范围内总色散介于±2.5 ps/(nm·km),非线性系数接近150 (W·km)-1。该光纤所呈现的超低平坦色散高非线性效应对四波混频具有重要应用价值。
Abstract
A novel type of photonic crystal fiber (PCF) with low dispersion and high nonlinearity for four-wave mixing is proposed. This kind of fiber is composed of a solid silica core and a cladding with squeezed-hexagonal-lattice elliptical air-hole along the fiber length. Its dispersion and nonlinearity coefficient are investigated simultaneously by using full vectorial finite element method. Numerical results show that proposed highly-nonlinear low-dispersion fiber has the total dispersion as low as ±2.5 ps/(nm·km) over ultra-broad wavelength range from 1.43 μm to 1.8 μm by adjusting the structure parameters of photonic crystal fiber, such as the hexagonal squeezing ratio, the relative air hole size and the air hole ellipticity, and the corresponding nonlinearity coefficient is about 150 (W·km)-1 at 1.55 μm. The proposed PCF with low ultra-flattened dispersion, high nonlinearity and high birefringence can have important applications on the four-wave mixing.

张亚妮. 低色散高非线性四波混频用光子晶体光纤的优化设计[J]. 光学学报, 2010, 30(s1): s100203. Zhang Yani. Design and Optimization of Low-Dispersion High-Nonlinear Photonic Crystal Fiber for Four-Wave Mixing[J]. Acta Optica Sinica, 2010, 30(s1): s100203.

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