Polarization-maintaining fiber composed of an elliptical ring core and two circular air holes.

In this paper, a new polarization-maintaining fiber (PMF) composed of an elliptical ring core and two circular air holes is exploited. The PMF could support 10 guided modes with refractive index differences Delta(n)(eff) of all the adjacent modes larger than 10(-4). Moreover, the optimum parameters of the PMF covering the entire C L band are obtained. Last, the chromatic dispersion D of the designed elliptical ring core fiber, the confinement loss alpha, and the power fraction chi of the two-air core are calculated. The calculation results show that D, alpha, and chi are compatible with traditional step-index fiber, and the designed elliptical ring core fiber is suitable for mode-division multiplexing and optical fiber sensors. (C) 2019 Optical Society of America