基于超连续谱产生的光子晶体光纤的特性研究

Characteristic Study of Photonic Crystal Fiber for Supercontinuum Generation

摘要:

采用多极法理论研究了光子晶体光纤的非线性和色散特性。数值模拟结果表明：保持孔直径与孔间距比值d/Λ不变，减小孔直径d；或者保持孔直径d不变，增大d/Λ，这两种方法都不仅可以显著提高光子晶体光纤的非线性，而且能够有效地将其零色散点λ0向短波长方向移动。光子晶体光纤的高非线性和灵活可调的色散特性为产生宽带、可见的超连续谱提供了前提条件。

Abstract:

The non-linearity and dispersion characteristics of photonic crystal fiber (PCF) were investigated theoretically by adopting the multipole method. The numerical simulation results show that the two approaches can not only evidently increase the non linearity of PCF, but also effectively extend the zero-dispersion wavelength λ₀ in short-wavelength direction: one way is to decrease the hole diameter d but under the same ratio d/Λ; the other way is to increase the ratio d/Λ but under the same hole diameter d. The high non linearity and flexible dispersion characteristics of PCF can provide preconditions for broadband and visible supercontinuum generation.