Role of structural anisotropy in geometric birefringence of high-birefringence index-guiding PCFs: analysis by moment of inertia
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We have studied the role of structural anisotropy on the geometric birefringence of four typical high-birefringence (HB) index-guiding photonic crystal fibers (PCFs) with the same air-silica structure and circular, ellipse, and rectangle air holes, respectively. The normalized difference between the moment of inertia ΔI in x and y direction of the PCF structure is utilized to quantificationally describe the structural anisotropy. We demonstrate that the phase birefringence B increases monotonously when the normalized ΔI rises in different cases of PCFs structures. In order to obtain high birefringence B, it can be an effective method to optimize the parameters of the structure to increase the normalized ΔI. This work can be not only a reference of founding the essence of geometric birefringence and proposing the optimal design of HB-IG-PCFs, but also an enlightenment for bringing the different method (compared to the finite element) into the investigation of PCFs.
KeywordsPhotonic crystal fiber (PCF) Birefringence Polarization maintenance Structural anisotropy Geometric birefringence Moment of inertia
This work is supported by the Fundamental Research Funds for the Central Universities (2018JBM070), the National Natural Science Foundation of China (Nos. 61675019, 61527822, and 61735005), the National Natural Science Foundation of Beijing (No. 4182054), Program for Changjiang Scholars and Innovative Research Team in University (Grant No. IRT_16R07), and the National Key R&D Program of China (2016YFC0800500).
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