Affiliation:
1. Tianjin Key Laboratory of Electronic Materials and Devices
2. Hebei Key Laboratory of Advanced Laser Technology and Equipment
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 LP01
x
and LP01
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 −9.68×10−4 is calculated with a beat frequency difference of 50.03 Hz between the LP01
x
and LP01
y
modes at a 6.2 m fiber end, which is in good agreement with that of −9.54×10−4 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.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Hebei Province
Natural Science Foundation of Tianjin City
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering