Abstract
A novel hybrid air-core photonic band-gap fiber (PBF) ring resonator with twin 90° polarization-axis rotated splices is proposed and demonstrated. Frist, we measure the temperature dependent birefringence coefficient of air-core PBF and Panda fiber. Experimental results show that the relative temperature dependent birefringence coefficient of air-core PBF is 1.42×10-8/°C, which is typically ~16 times less than that of Panda fiber. Then, we extract the geometry profile of air-core PBF from scanning electron microscope (SEM) images. Numerical modal is built to distinguish the fast axis and slow axis in the fiber. By precisely setting the length difference in air-core PBF and Panda fiber between two 90° polarization-axis rotated splicing points, the hybrid air-core PBF ring resonator is constructed, and the finesse of the resonator is 8.4. Environmental birefringence variation induced by temperature change can be well compensated, and experimental results show an 18-fold reduction in thermal sensitivity, compared with resonator with twin 0° polarization-axis rotated splices.
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This work has been supported by the National Natural Science Foundation of China (No.61473022).
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Feng, Ls., Wang, K., Jiao, Hc. et al. Reduced thermal sensitivity of hybrid air-core photonic band-gap fiber ring resonator. Optoelectron. Lett. 14, 17–20 (2018). https://doi.org/10.1007/s11801-018-7217-8
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DOI: https://doi.org/10.1007/s11801-018-7217-8