Abstract
The PANDA segmented ring-core (SERC) few-mode fiber (FMF) can further enhance its characteristic of separating the eigenmodes by dividing the RC into several ring-sectors (RSs) with variable angles and decreasing refractive indices in the azimuthal direction. The novel PANDA SERC FMF with an appropriate choice of parameters can support 10 fully separated eigenmodes, where minimum effective index differences min(∆neff) between adjacent eigenmodes can reach 3.5 × 10−4 over the whole C + L band. Moreover, the group velocity dispersion (GVD), effective mode areas and losses of the fiber are within the range of (−42, 20) ps/nm/km, (31, 75) μm2 and (0.4, 0.56) dB/km over the whole C + L band. Numerical results show that the designed fiber has excellent bending resistance, while the splice losses between standard step-index fiber and PANDA SERC FMF are within the range of 0.62–1.05 dB at 1550 nm. Consequently, the proposed fiber can provide a promising way to design the fully degeneracy-lifted polarization-maintaining (PM) FMF for the mode-division multiplexing (MDM) transmission.
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