Elliptical hollow core tube lattice fibers for terahertz applications |
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| Affiliation: | 1. Centre for THz Research, China Jiliang University, Hangzhou, 310018, China;2. College of Information Engineering, China Jiliang University, Hangzhou, 310018, China;3. Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province, College of Information Engineering, China Jiliang University, Hangzhou, 310018, China;1. School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing 100044, China;2. School of Electronic and Information Engineering, Hebei University of Technology, China;1. Key Lab of In-Fiber Integrated Optics of Ministry of Education, and College of Physics and Opto-Electronic Engineering, Harbin Engineering University, Harbin 150001, China;2. School of Physics, Harbin Institute of Technology, Harbin 150000, China;1. School of Electronic Engineering, Xi’an University of Posts and Telecommunications, Xi’an 710121, China;2. School of Information Science and Engineering, Fudan University, Shanghai 200433, China |
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| Abstract: | Hollow core microstructured fibers whose cladding is composed by an elliptical arrangement of circular dielectric tubes are numerically investigated. Birefringence, differential group delay, and polarization dependent loss are evaluated for different values of ellipticity in order to quantify its effect on the two polarizations of the fundamental core mode. All these parameters have a minimum at the center of each transmission window and they assume maximum values at the edges. In particular, the birefringence goes always to zero irrespective of ellipticity. This proves that tube lattice fibers are strongly immune against unwanted core shape deformation, in particular when the working frequency is close to the center of the transmission windows. On the other hand they are not suitable to obtain polarization maintaining fibers. |
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