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设计了一种新型六角点阵光子晶体光纤,该光纤在波长1 350～1 800nm范围内呈现高双折射低损耗大负色散。采用全矢量有限元法结合各向异性完美匹配层边界条件,对其双折射、约束损耗、色散、非线性和模场等特性进行了数值模拟。研究表明,新设计的光纤对模场有很强的约束能力,在波长1 550nm处双折射高达2.08×10-2,模约束损耗接近10-1 dB·km-1,负色散值高达-910ps·km-1·nm-1,模场面积高达2.67μm2,非线性系数仅有0.043m-1·W-1。该光纤将在光纤激光器、光纤放大器、光滤波器和光纤传感系统方面有重要的应用。
A new type of hexagonal lattice photonic crystal fiber is designed. The fiber exhibits high birefringence, high loss and large negative dispersion in the wavelength range from 1 350 to 1 800 nm. The full-bounded finite element method is used to simulate the birefringence, constraint loss, dispersion, nonlinearity and mode field in combination with the anisotropic perfect matching layer boundary conditions. The results show that the newly designed optical fiber has a strong constraint on the mode field, with a birefringence of up to 2.08 × 10-2 at a wavelength of 1550 nm, a mode loss of nearly 10-1 dB · km-1 and a negative dispersion value of -910 ps · Km-1 · nm-1, the mode field area is up to 2.67μm2, and the nonlinear coefficient is only 0.043m-1 · W-1. The fiber will have important applications in fiber lasers, fiber amplifiers, optical filters and fiber optic sensing systems.