Abstract
The correlation and power distribution of intercore crosstalk (ICXT) field components of weakly coupled multicore fibers (WC-MCFs) are important properties that determine the statistics of the ICXT and ultimately impact the performance of WC-MCF optical communication systems. Using intensive numerical simulation of the coupled mode equations describing ICXT of a single-mode WC-MCF with intracore birefringence and linear propagation, we assess the mean, correlation, and power distribution of the four ICXT field components of unmodulated polarization-coupled homogeneous and quasi-homogeneous WC-MCFs with a single interfering core in a wide range of birefringence conditions and power distribution among the field components at the interfering core input. It is shown that, for homogeneous and quasi-homogeneous WC-MCFs, zero mean uncorrelated ICXT field components with similar power levels are observed for birefringence correlation length and birefringence beat length in the ranges of 0.5m,10m and 0.1m,10m, respectively, regardless of the distribution of power between the four field components at the interfering core input.
Highlights
Intercore crosstalk (ICXT) is one of the most important physical impairments of weakly coupled multicore fibers (WC-MCFs)
Wide range of situations, considering 13 different pairs of birefringence correlation length and birefringence beat length, ( LC,L B ), in the ranges indicated in Section 3.1, both for homogeneous ∆β c,mn = 0 rad · m−1 and quasi-homogeneous ∆β c,mn = −701 rad · m−1 single-mode WC-MCFs have been tested
We carry out an analysis similar to the one performed in Section 5.1 but for quasi-homogeneous single-mode WC-MCF with ∆β c,mn = −701 rad · m−1
Summary
Intercore crosstalk (ICXT) is one of the most important physical impairments of weakly coupled multicore fibers (WC-MCFs). For polarization-coupled WC-MCFs, a preliminary study of the probability density function (PDF) of the ICXT power fluctuations has been presented [23] where a χ2 distribution with four degrees of freedom has been shown using numerical simulation for a homogeneous WC-MCF and two pairs of values of birefringence correlation length and birefringence beat length. This shows that, for polarization-coupled WC-MCFs, at least for some specific conditions, the four ICXT field components are zero mean uncorrelated gaussian-distributed. For both homogeneous and quasihomogeneous WC-MCFs, the four ICXT field components are zero mean and uncorrelated and have similar power levels for birefringence correlation length and birefringence beat length in the ranges of [0.5 m, 10 m] and [0.1 m, 10 m], respectively
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