摘要
The various mode effective indices of the doped photonic crystal fibers (PCFs) are compared, the mode field distributions of the fundamental mode and the second-order mode are analyzed, and the single-mode condition is presented. The mode effective indices of large-core doped PCFs with different core indices and structure parameters are simulated by the finite element method (FEM). The relations of the core index with the fiber structure parameters of pitch, hole-to-pitch ratio and core diameter are obtained for single-mode propagation. In the design and fabrication of the doped PCF, we can adjust the core index and fiber structure parameters to achieve large mode area and single-mode propagation.
The various mode effective indices of the doped photonic crystal fibers （PCFs） are compared, the mode field distribu tions of the fundamental mode and the secondorder mode are analyzed, and the singlemode condition is presented. The mode effective indices of largecore doped PCFs with different core indices and structure parameters are simu lated by the finite element method （FEM）. The relations of the core index with the fiber structure parameters of pitch, holetopitch ratio and core diameter are obtained for singlemode propagation. In the design and fabrication of the doped PCF, we can adjust the core index and fiber structure parameters to achieve large mode area and singlemode propagation.
基金
This work has been supported by the National Basic Research Program of China （No.2010CB327604）, the National Natural Science Foundation of China （Nos.60978028, 61201110 and 61205084）, the Science and Technology Development Program of Hebei Province （No. 12211015）, and the Science and Technology Development Program of Qinhuangdao （Nos.2012021A130 and 201001A087）.
