Modal cutoff in rare-earth-doped photonic crystal fibers with multi-layer air-holes missing in the core |
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Authors: | Xing-tao Zhao Yi Zheng Xiao-xu Liu Shu-guang Li Ying Han Zhi-yun Hou Na Wang and Lan-tian Hou |
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Affiliation: | 12373. Key Lab. of Measurement Technology and Instrumentation of Hebei Province, State Key Lab. of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China 22373. Laser Institute of Science College, Beijing Jiaotong University, Beijing, 100044, China 32373. College of Physics and Chemistry, Hebei Normal University of Science&Technology, Qinhuangdao, 066004, China
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Abstract: | 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. |
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