大有效面积环型单模光纤的色散特性

Dispersion characterization of the large effective-area single-mode fibers with ring index profiles

针对两种大有效面积环型单模光纤模型,提出了计算其波导色散的一种新方法,详细分析了几何参数和光学参数对基模传输时波导色散特性的影响.研究结果发现,通过适当调整参数,在保持大的有效面积情况下可以获得较好的色散平坦特性.在1500～1620nm范围内,设计了一个具有总色散小于0.07ps/(nm·km),色散斜率小于0.004ps/(nm^2·km),同时有效面积大于113μm^2的色散平坦光纤.

A feasible approach to calculate waveguide dispersion was established for two kinds of the large effective-area fibers with the ring index profiles named R1 and R2 type. The influences made by the geometric parameters and optical parameters on the waveguide dispersion were analyzed in detail. The calculated results indicate that a fine dispersion-flattened characteristic with the larger effective-area can be obtained by adjusting the geometric and optical parameters in a region of wavelengths. In the spectral range of 1 500-1620 nm, a dispersion-flattened fiber with the total dispersion of below 0.07 ps/（nm.km）, dispersion slope of below 0,004 ps/（nm^2,km） and the effective areas of from 113 to 193 μm^2 ispresented.