平坦色散高非线性光子晶体光纤的研究与制备

运用改进的全矢量有效折射率法(IFVEIM),研究了光子晶体光纤结构(PCF)参数改变时,光纤的色散系数、有效模场面积和非线性系数随波长的变化规律,深入地分析了光纤可调节的色散平坦特性和高非线性特性.课题组自行设计了一种在900nm附近具有低平坦色散高非线性特性的光子晶体光纤.并且在改进工艺的基础上,采用包层孔充气挤压法对其进行了制备,虽然制得的光纤各参数未达到设计值,但其在800～1000nm的波段内色散值仅为0.75ps/km/nm,非线性系数值则达到了30(W/km)-1,这在当前规则结构的纯硅光子晶体光纤中已经较高.

Fabrication and Investigation of Photonic Crystal Fiber with Flattened Dispersion and High Nonlinearity

Using improved fully vectorial effective index method(IFVEID),while keeping the structure parameters altered,the dispersion coefficient,the effective mode area and the nonlinear coefficient of PCF as a function of wavelength is investigated.Based on the analysis,a highly nonlinear PCF with low flattened dispersion on the verge of infrared wave band nearby 900nm is designed by ourselves.Furthermore,it is fabricated with the extrusion method of the cladding holes infused air through improving the technics.Although the PCF fabricated has not achieved the ideal value,its dispersion coefficient is merely 0.75 ps/km/nm and non-linear coefficient achieves 30 (W/km)-1,higher in PCFs made of silicon.