The complete analytical solutions of the mode-coupling dynamics for seven-core multicore fibers (MCFs) with identical cores is proposed. All the coupling coefficients of adjacent cores and nonadjacent cores as a function of the structural parameters are investigated. It is shown that the coupling coefficients can decrease by adjusting the structural parameters. In addition, the trench-assisted structure could be used for suppressing cross talk in MCF, and the effective area can be enlarged without degrading the crosstalk properties. Simulations suggest that low cross talk and/or large could be achieved by adjusting the trench parameters. Large mode area could be obtained by utilizing small trench (small trench width , small refractive index difference ) in the trench-assisted MCF (TA-MCF), whereas low cross talk could be achieved by utilizing larger trench (large trench width , large ) in the TA-MCF.
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