Multipath interference characterization of bend-insensitive optical fibers and short jumpers

Multipath interference (MPI) in bend-insensitive optical fibers is investigated by analyzing different aspects, ranging from a review of the theoretical background, through the analysis of measurement issues, to the characterization of short patch cords. Two setups for the characterization of MPI are analyzed, highlighting their advantages and limitations. Then, a number of commercial bend-insensitive fibers are compared, showing that they generally exhibit a level below -30 dB in the range of 1250-1350 nm. The investigation also includes short offset-spliced fiber segments, with lengths to 1 cm, to simulate the behavior of field-installable connectors and isolate their contribution to the MPI. The results show a step-like increment of MPI when two or more cm-long fiber segments are cascaded.