For the purpose of satisfying the demands of polarization-maintaining fibers for fiber optic gyroscopes, this article proposes a semicircular cladding birefringent hollow-core anti-resonant fiber. &e influence of structural parameters on the birefringence, loss, and bending loss of the fiber is studied. &e simulation results demonstrate that at 1550 nm, the ultimate loss of the fundamental mode of x and y polarization is 1.76 dB/m and 0.93 dB/m, respectively. &e birefringence can reach 1 × 10−4, and the wavelength range of birefringence greater than 10−4 can reach 60 nm. &is indicates that it has excellent bending properties. &e proposed optical fiber has excellent performance in polarization maintenance and can supply ideas for the research of highprecision fiber optic gyroscopes and other optical devices.
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