提出了以硅为基质、高折射率铋化合物作为纤芯的多固体芯集束型光子晶体光纤(PCF)。该类光纤利用全内反射型机制将传输光场约束在高折射率固体棒芯中,并能输出相同强度的光。通过数值模拟分析了集束六芯六角形和集束八芯四方形两种光子晶体光纤的有效模场面积和非线性系数随抽运波长以及纤芯直径的变化规律,证明了这种光纤同时具有等效的高非线性和大的有效模场面积的特性,可以用于实现高功率频率变换。

The novel cluster-solid-core photonic crystal fiber (PCF) is proposed, which is structured by the bismuth silicate glass cores with a higher refractive index and the fused silica base with a lower refractive index. In particular, the guiding is only localized in the cluster-solid-core region by the total internal reflection (TIR). While the same power output from each solid-core in the PCF can be obtained. The nonlinearity and the mode field area of the cluster-six-core PCF and the cluster-eight-core PCF versus the pump wavelength and the core diameter are discussed by numerical simulation. The results show that the novel PCF designs have the specialities of the equivalently higher nonlinearity and the effectively large mode-field area, and can offer a significant potential in high-power frequency transform.