Abstract
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 $\Delta {n_{{\rm eff}}}$ 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.
© 2019 Optical Society of America
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