通信系统中低色散多孔光纤的研究和分析

Study and Analysis of Dispersion Properties of Varying Holey Fiber in Communication System

提出了方形不变的空气孔多孔光纤,并借助于二维时域有限差分法计算了孔间距取1.9μm,孔直径分别为0.9μm、1.0μm、1.1μm,以及孔直径取1.1μm,孔间距分别为1.9μm、2.0μm、2.1μm的五层方形不变的空气孔多孔光纤的基模色散曲线,并对它们的色散特性进行了比较.结果表明:这种不变多孔光纤的色散依赖于孔直径和孔间隔的比值.当它们的比值小于等于0.5时,光纤的色散曲线在1200 nm^1800 nm的波长范围内保持平坦且具有更低的色散量.

A square- lattice no- varying porous optical fiber is proposed. Using finite - difference time- domain method, the dispersion curves of five - ring square- lattice no- varying porous optical fiber are calculated, hole - to- hole space of which is 1.9 tan, the hole diameter is 0.9 tan, 1.0 tan, 1.1 tan, and hole diameter of which is 1.1 μm, the hole- to- hole space is 1.9 tan, 2.0 tan, 2.1 tan, and the comparison has been carried on to their chromatic dispersion characteristic. The result shows that this kind of invariable porous optical fiber＇s chromatic dispersion relies on the hole diameter and hole gap ratio, when their ratio is smaller than or equal to 0.5, the dispersion curves of which can remain flatter and lower in 1200 nm - 1800 nm. examining the break - time activities from a new concept of PE teaching.