Investigation of channel model for weakly coupled multicore fiber

TL;DR

This paper studies the evolution of inter core crosstalk decorrelation bandwidth in weakly coupled multicore fibers, combining theoretical, numerical, and experimental methods to propose a new channel model for system simulation.

Contribution

It introduces a novel channel model based on phase transfer function that accurately simulates IC-XT decorrelation behavior in WC-MCFs.

Findings

Decorrelation bandwidth decreases with transmission distance.

The proposed model aligns well with experimental results.

The model provides a reliable simulation platform for WC-MCF systems.

Abstract

We investigate the evolution of decorrelation bandwidth of inter core crosstalk (IC-XT) in homogeneous weakly coupled multicore fibers (WC-MCFs). The modified mode-coupled equations (MCEs) are numerically solved by combining the fourth order Runge-Kutta method and compound Simpson integral method. It can be theoretically and numerically observed that the decorrelation bandwidth of IC-XT decreases with transmission distance by fractional linear function. The evolution rule of IC-XT's decorrelation bandwidth is further confirmed by experiments, which can be used as an evaluation criterion for channel model. Finally, we propose a new channel model with the coupling matrix of IC-XT generated automatically by phase transfer function (PTF), which is in good agreement with the above evaluation criterion. We believe the proposed channel model can provide a good simulation platform for homogeneous WC-MCF based communication systems.