Abstract
For one-polarization mode-division-multiplexed (MDM) system using sparse 2 × 2 MIMO equalizers over twofold spatially degenerate (TSD) LP modes, we numerically investigate the discrete modal crosstalk (XT) behaviors due to splices in weakly coupled few-mode fibers. Its impacts on transmission distance of uncoupled MDM link are comparably analyzed by evaluating the extreme cases relevant to the required splicing tolerances. Under different splicing conditions, the complexity of 2 × 2 MIMO equalizers is assessed by intra-modal relative group delay (RGD) emulation. Simulation results show that, by specifically controlling the lateral offsets at splicing points, an intra-modal RGD reduction of TSD LP11 modes can be obtained, benefiting the tap number decrease of the corresponding 2 × 2 MIMO equalizer. Besides, the propagation of TSD LP21 modes is verified to possess intra-modal splice-XT-immune property, indicating that the relevant intra-modal RGD will not be affected by splices.
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