Abstract
We present a design method of homogeneous trench-assisted multicore
fibers (TA-MCFs) based on an analytical model utilizing an analytical
expression for the mode coupling coefficient between two adjacent cores.
The analytical model can also be used for crosstalk (XT) properties
analysis, such as XT reduction amount versus trench width, trench depth,
and other fiber structural parameters as compared with normal step-index
MCFs. Furthermore, the model can be used to search for core positions for
further XT reduction in nonclose-packed structures. For instance, we show
that a dual-ring structure is the quasi-optimum core layout starting from
an one-ring structured 12-core fiber. Based on the analytical model, a
square-lattice structured 24-core fiber and a 32-core fiber are designed
both for propagation-direction interleaving (PDI) and non-PDI transmission
schemes. The proposed model provides a powerful tool for designing
high-count homogeneous TA-MCFs.
© 2016 IEEE
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