准光子晶体光纤的色散特性

Dispersion Property of Photonic Quasicrystal Fibers

设计了几种在较宽的通信区域色散平坦的准光子晶体光纤(PQF),借助于全矢量有限元法,分别研究了基于双包层结构的2种准晶格光子晶体光纤的色散特性。数值模拟结果指出:对于PQF1,通过合理选择结构的参数,在光通信窗口1.45～1.65μm的范围内准光子晶体光纤的色散数值可以控制在-2.41±0.28ps/(km.nm)。小幅度增大孔间距,可在1.350～1.736μm的较宽波长范围内得到一条近零平坦色散曲线,其色散值|D|可以控制在1 ps/(km.nm)左右,达到-0.45～0.57 ps/(km.nm)。对于PQF2,在1.45～1.68μm的范围内其色散值可以控制在4.795±0.355 ps/(km.nm)。

Several new photonic quasicrystal fibers（PQFs） with uhra-flattened chromatic dispersion at wide range of the telecommunication-window are presented. Based on the full vectorial model, the finite element method is adopted to analyze the dispersion properties of photonic quasicrystal fiber with double-clad structure. According to the numerical simulation results of the PQF1 , the disper- sion of the photonic quasicrystal fiber can be controlled within - 2.41 ± 0.28 ps/（ km · nm） in 1.45 - 1.65μm optical communication-window. Afterwards, we get a near-zero flattened dispersion curve by increasing the hole spacing. In a wide wavelength range from 1. 350 to 1. 736 μm, the re- gion of dispersion variation is from -0.45 to 0.57 ps/（km ·nm）. For PQF2, the dispersion value can be controlled within 4. 795 ± 0. 355 ps/（ km ·nm） by adjusting the parameters in the wave- length range of 1.45 to 1.68 μm.