Abstract
Mode division multiplexing (MDM) based few-mode fiber (FMF) transmission scheme is considered as one of the promising choices when one trying to achieve high bit rates in cascade to reduced cost per bit and upgrading the fiber capacity. Nonlinear mode coupling over FMFs can be addressed as the main degradation issue that can limit the efforts to reach their full capacity. In this work, we propose a new method to reduce nonlinear modal coupling by suppressing phase matching between different fiber modes using wavelength interleaving (WI) technique. This technique relays on interleave the optical carrier wavelength in a specific mode from those in adjacent ones. The five modes MDM system is analytically modeled and numerically demonstrated. Each spatial mode is modulated by a 4-ary quadrature amplitude modulation (4QAM) format with a symbol rate of 20 Gsymbol/s. The results reveal that the nonlinear phase (NLP) noise is reduced and the signal to noise ratio (SNR) is increased when applying the WI method. Additionally, it turned out that analytical and numerical results are in good agreement with each other.
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