Hansen K P, Petersson A, Folkenberg J R, Albertsen M, Bjarklev A
Crystal Fibre A/S, Blokken 84, dk-3460 Birkerod, Denmark.
Opt Lett. 2004 Jan 1;29(1):14-6. doi: 10.1364/ol.29.000014.
We investigate how the strongly wavelength-dependent birefringence in nonlinear photonic crystal fibers leads to a splitting in the zero-dispersion wavelength for the two polarizations. We translate the requirements for the maximum splitting of the zero-dispersion wavelength to requirements for transverse structural uniformity by adopting a simple effective-index approach in which the birefringence is calculated in a step-index fiber with an elliptical core. We find that to reduce the splitting to less than 1 nm the birefringence should be less than 2 x 10(-5), resulting in a transverse uniformity requirement of 1-3%, depending on the index step from the core to the cladding.
我们研究了非线性光子晶体光纤中强烈依赖波长的双折射如何导致两种偏振态的零色散波长发生分裂。通过采用一种简单的有效折射率方法，我们将零色散波长最大分裂的要求转化为对横向结构均匀性的要求，在该方法中，双折射是在具有椭圆形纤芯的阶跃折射率光纤中计算的。我们发现，要将分裂减小到小于1纳米，双折射应小于2×10^(-5)，根据纤芯到包层的折射率阶跃，这导致横向均匀性要求为1%-3%。
