A novel photonic crystal fiber with near-circular mode field distribution for the application of fiber optic gyroscope

摘要

In this letter, we reported on a polarization-maintaining photonic crystal fiber (PM-PCF) with near-circular mode field distribution. The modal field distribution of the proposed PM-PCF is near-circular, which enhanced the mode field compatibility between PM-PCFs and traditional polarization-maintaining fibers (PMFs). And the birefringence of the novel PM-PCF can easily achieve the order of 10~(-3)-10~(-2), which is at least 1-2 order of magnitude higher than that of commonly used Panda or Bow-tie PMFs. Additionally, the diameter of this PM-PCF is much smaller than traditional PM-PCFs. It can well satisfy the application of fiber optic gyroscope (FOG) which need high polarization-maintaining, high-precision and miniaturization.