Abstract

The birefringence in a dual-hole microstructured optical fiber is numerically calculated and characterized with an optical frequency domain reflectometry (OFDR) method. Due to the asymmetric dual air holes in the cross-section, the polarized ${\rm LP}_{01}^x$ and ${\rm LP}_{01}^y$ modes propagate with different group velocities and time delays. Through a polarized coherent OFDR system in experiment, the Fresnel reflection peaks for each mode are separated in the frequency domain with their corresponding beat frequency. Thus, the group birefringence ${-}{9.68} \times {{10}^{- 4}}$ is calculated with a beat frequency difference of 50.03 Hz between the ${\rm LP}_{01}^x$ and ${\rm LP}_{01}^y$ modes at a 6.2 m fiber end, which is in good agreement with that of ${-}{9.54} \times {{10}^{- 4}}$ from the theoretical simulation. Our demonstration provides an accurate and flexible method for group birefringence characterization in microstructured optical fibers with complex cross-sectional structures.

© 2024 Optica Publishing Group

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