Abstract
We present a side-hole-assisted weakly coupled polarization-maintaining rectangular ring-core multimode fiber supporting 68 eigenmodes. The rectangular ring-core and side-hole structures are introduced to effectively split eigenmodes. The impact of parameters on mode utilization rate $\eta$ and mode number is evaluated at the wavelength of 1550 nm. We also analyze bending loss and broadband performance of the entire C band, including ${{n}_{{\rm eff}}}$, $\Delta {{ n}_{{\rm eff}}}$, ${{\rm A}_{{\rm eff}}}$, nonlinearity, and differential mode delay. By optimizing the design parameters, the 68 eigenmodes are completely separated with $\Delta {{n}_{{\rm eff}}}$ between adjacent modes larger than ${{10}^{- 4}}$ over the whole C band. The designed fiber can be used for eigenmode-division multiplexing networks to improve transmission capacity and spectral utilization.
© 2021 Optical Society of America
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