Fig. 1. Cross-section of“—”typed suspended-core fiber and refractive index of two glasses. (a) Fiber cross-section；(b) refractive index of Ge₁₀As₂₄Se₆₆ and Ge₁₀As₂₃Se₆₇ glasses

Fig. 2. Cross-section of fibers with diverse cores under the same condition. (a) Rectangular core; (b) elliptical core; (c) square core; (d) circular core

Fig. 3. Birefringence of fibers with diverse cores under the same condition

Fig. 4. Birefringence variation with d and confinement loss at maximum birefringence. (a) Birefringence versus d for different b values; (b) confinement loss at d＝5.1 μm and corresponding mode field distributions

Fig. 5. Birefringence variation with aspect ratio (a/b) of rectangular core. (a) At wavelength of 1.55 μm; (b) wavelength range from 1.55 to 5 μm

Fig. 6. Birefringence variation with radius r of air hole

Fig. 7. Optical properties of optimized structure. (a) Birefringence; (b) confinement loss; (c) dispersion

Fig. 8. Cross-section of optical fiber connector and birefringence of proposed fiber. (a) Cross-section; (b) birefringence