Study of MPI measurement conditions and MPI characteristic in BIF

• We investigated the suitable sampling interval over FSR for MPI measurement.
• We investigated the effect of randomized polarization states for MPI measurement.
• We confirmed the suitable measurement conditions experimentally and numerically.
• We showed the MPI characteristic of BIF with offset connections and tight bends.
• To take account of the MPI degradation in BIF is very important for access networks.

We investigated the measurement conditions for measuring multipath interference (MPI) occurring between fundamental and higher order modes. We considered the sampling interval as a function of the free spectral range (FSR) as a measurement condition. We also investigated the effect of randomized polarization states when measuring the MPI characteristics. We then confirmed the MPI characteristic, which we measured using three methods with a suitable sampling interval over FSR value and a suitable number of repetitions of randomized polarization states. Furthermore, we describe the MPI characteristic of bending loss insensitive fibers (BIFs) with offset connections and tight bends. We discuss the MPI degradation factor in an access network employing BIF.