改进的正方形格点双芯光子晶体光纤的负色散特性分析

Analysis of Negative Dispersion Properties of a Photonic Crystal Fiber with Modified Square Lattice and Double Concentric Cores

设计了一种改进的正方形格点双芯负色散光子晶体光纤,其包层是由在纯硅背景上以正方形格点排列的三种大小不同的空气孔构成,这些空气孔和中心的缺陷形成了这种负色散光子晶体光纤的双芯。用频域有限差分法对其分析表明,该光子晶体光纤具有宽带负色散的特性。当相邻空气孔间距取2.05μm,空气孔直径分别取1.9μm,1.3μm,0.9μm时,可在1.55μm处实现宽带负色散,其半峰全宽超过了300 nm。这种光纤可用于波分复用光纤通信系统中的宽带色散补偿。

A negative dispersion photonie crystal fiber （PCF） with modified square lattice and double concentric cores is proposed. The cladding is composed of three different air holes with square lattice based on pure silicon and these air holes and its concentric defect form the double core of this photonic crystal fiber. By using the finite difference frequency domain algorithm, the negative dispersion properties is analyzed. Results show that broadband negative dispersion can be achieved. Broadband negative dispersion with full width at half maximum exceeding 300 nm is realized at 1.55 μm wavelength when the air-hole pitch, the diameters of airholes is 2. 05 μm, 1. 9μm, 1. 3μm, 0. 9 μm respectively. So this fiber can be used for broadband dispersion compensation in wavelength-division multiplexing optical fiber communication systems.