Design of ring-sector-assisted PANDA ring-core few mode fiber

Abstract:

For the PANDA ring-core polarization-maintaining few-mode fiber (RC-PM-FMF) with the given supported eigenmodes, the minimum effective refractive index difference min(Dneff) between the adjacent eigenmodes decreases with the RC size. Consequently, we propose a PANDA RC-PM-FMF assisted by a ring-sector (RS) structure, which can be used to mainly increase the Dneff values between the adjacent even and odd eigenmodes with the same polarization. The RS-RC-PM-FMF with an appropriate choice of the parameters can support 10 linearly polarized (LP) eigenmodes, which have min(Dneff) values higher than 1.9´10-4 for the adjacent eigenmodes over the whole C + L band. Furthermore, the fiber is characterized by the low group velocity dispersion (GVD) (−40—20 ps.nm-1.km-1) and effective mode areas (63—104 mm2), while the total losses are within the range of 0.19—0.23 dB/km over the whole band.