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Cladding-ring-equivalent effective index method for analyzing the propagation characteristics of multi-cladding photonic crystal fibers |
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| Authors: | Jinhui Yuan Xinzhu Sang Chongxiu Yu Xiangwei Shen Ying Han Guiyao Zhou Shuguang Li Lantian Hou |
| Institution: | 1. State Key Laboratory of Information Photonics and Optical Communications (Beijing University of Posts and Telecommunications), P.O. Box 163 (BUPT), 100876, Beijing, China;2. Institute of infrared optical fibers and sensors, physics department, Yanshan University, 066004,Qinhuangdao, China;3. School of Information and Optoelectronic Science and Engineering, South China Normal University, 510006, Guangzhou, China;1. MTA-PTE High-Field Terahertz Research Group, Ifjúság ú. 6, 7624 Pécs, Hungary;2. Institute of Physics, University of Pécs, Ifjúság ú. 6, 7624 Pécs, Hungary;3. Szentágothai Research Centre, University of Pécs, Ifjúság ú. 20, 7624 Pécs, Hungary;4. ELI-ALPS, ELI-Hu Nkft., Dugonics tér 13, 6720 Szeged, Hungary;1. College of Physics, Qingdao University, Qingdao, 266071, China;2. Key Laboratory of Photonics Materials and Technology in Universities of Shandong, Qingdao University, Qingdao, 266071, China;3. Department of Physics, Hamline University, Saint Paul, MN 55104, USA |
| Abstract: | Cladding-ring-equivalent effective index method (CREEIM) is proposed to analyze the propagation characteristics in the multi-cladding photonic crystal fibers (MCPCFs). The effective indices and dispersions of the step index two and three-cladding structures are calculated with the Sellmeier formula. The accuracy of CREEIM is competitive to the results calculated by the multipole method (MPM). With different structure parameters, the differences between two methods are evaluated with the relative error RE of effective index and relative difference RD of dispersion. This method is also used to analyze the mode cut-off and nonlinear characteristics in the three-cladding structure PCFs by calculating the mode effective index neff instead of complex mode field distribution. |
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