利用有限差分光束传播法模拟了光波在环形结构塑料光子晶体光纤内的传输情况,讨论了基模有效折射率与光纤结构的关系,并分析了色散特性随孔间距、孔大小变化的一般规律,发现塑料光子晶体光纤的总色散主要来自材料色散,尤其在短波长范围内材料色散更是居于主导地位,但随波长的增大波导色散逐渐增大,可以设计零色散波长位于可见光波段的塑料光子晶体光纤,此光纤也能很好地应用到非线性领域.

The transmission properties of the ring-structured plastic photonic crystal fibers are simulated with finite-difference beam propagation method.The relationship between effective index of fundamental mode and the structure of the fiber is discussed.The variation rules of dispersion properties with both pitch and size of air holes have been analysed.It is found that the total dispersion of the plastic photonic crystal fiber mostly comes from the material dispersion,which plays an important part especially in the short wavelength region,and the waveguide dispersion increases with the increase of wavelength.The appropriate designing of plastic photonic crystal fiber can yield zero dispersion in the visible light region,and the fiber can be well applied to the nonlinearity field.