Polarization dependent inter-core interferences in twin-core photonic crystal fiber and its application to high temperature measurement |
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| Authors: | Bongkyun Kim Youngjoo Chung |
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| Institution: | 1. Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China;2. Key Laboratory of All Optical Networl and Advanced Telecommunication Network of Ministry of Education, China;1. School of Electrical Engineering and Information, Sichuan University, China;2. College of Electronics and Information Engineering, Sichuan University, China;3. Department of Embedded Systems Engineering, Incheon National University, Republic of Korea;1. Departamento de Física Aplicada, ICMUV, Universidad de Valencia, Dr. Moliner 50, Burjassot E-46100, Spain;2. Instituto de Física Rosario (CONICET-UNR), Blvr. 27 de Febrero 210bis, S2000EZP Rosario, Argentina;3. Pontificia Universidad Católica Argentina, Facultad de Química e Ingeniería, Av. Pellegrini 3314, 2000 Rosario, Argentina |
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| Abstract: | We investigate polarization dependent differential group modal index sensitivity to temperature in twin-core photonic crystal fiber. Characteristics of guided modes and the group modal index difference in twin-core photonic crystal fiber (TC-PCF) are numerically analyzed. The geometrical asymmetry between the two cores induces significantly reduced power coupling between two core modes and difference in their effective indices. Two cores form two effective optical paths. We also experimentally demonstrate polarization dependent differential group modal index sensitivity to the temperature. Since the TC-PCF has polarization dependent group modal index difference, TC-PCF based interferometer shows input polarization dependent free spectral range and temperature sensitivities. The effective index difference between the two core modes tends to increase when the temperature increases. |
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