Analysis of Crosstalk Performance and its Reduction Amount in Single-mode Homogeneous Trench-assisted Multicore Fiber

An investigation has been done in 7-core homogeneous trench-assisted multicore fiber for analysis of crosstalk performance under certain variations in refractive index profile of core, clad, and trench for fundamental mode. The crosstalk estimation and suppression technique has been discussed, in order to realize the fabrication and characterization of multicore fiber. The crosstalk reduction amount (in dB) has been observed with respect to the variation in relative refractive index difference of core-clad (Δ
₁
), and that of clad-trench (Δ
₂
), (i.e., the trench depth) along with the trench width. The result states that the crosstalk reduction amount (ΔXT) decreases as the Δ
₁
increase, and ΔXT increases as the Δ
₂
increase. Moreover, the XT behavior has been analyzed by varying the core diameter and transmission distance for step-index and trench-assisted cores. The ultra-low inter-core crosstalk can be obtained in MCF by using trench-assisted core at Δ
₁
of 0.70% and Δ
₂
of -0.70% for 100 Km long haul optical communication.