光子晶体光纤参量放大的理论模拟

光子晶体光纤具有高非线性系数和非常灵活的色散特性，通过调节光子晶体光纤的结构参量，可在具有高非线性系数的同时对光子晶体光纤的零色散波长(λ0)进行调节。利用光子晶体光纤的这些特性可实现在所需波长上的高效率的参量放大。本文采用厄密-高斯函数展开的方法，计算了六角形光子晶体光纤(HF)的零色散波长，发现当气孔间距在1．1μm和2．6μm之间时，光子晶体光纤的零色散波长在1．55μm附近，并给出了零色散波长时气孔间距和气孔大小的关系曲线。对光子晶体光纤中的参量放大(OPA)进行了理论模拟，计算表明在20m光子晶体光纤中，当峰值功率为10W时，参量放大的增益可达60dB，或可获得300nm增益带宽。

Simulation of Optical Parametric Amplification Using Holey Fiber

Holey fiber (HF) can have high nonlinearity and very flexible dispersion. The zero-dispersion wavelength (λ 0) of HF with high nonlinearity can be adjusted by changing the structure parameters of PCF. This can used to generate high efficient optical parametric amplification (OPA) at desired wavelength in HF. Hermite-Gaussian functions have been used to calculate the zero-dispersion wavelength of hexagon HF, calculations show that when pitch is between 1.1 μm and 2.6 μm, the λ0 of HF is around 1.55 μm, and the relation of pitch vs air hole diameter at λ0 has been given. Simulations of the OPA in HF show that gain of OPA can reach 60 dB in only 20 m HF with pump power of 10 W, or the bandwidth of OPA can reach 300 nm.