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Numerical Investigation of orbital angular momentum mode purity in Inverse Parabolic Graded index fiber

Orbital angular momentum is seriously considered as an additional degree of freedom that enhances the capacity transmission in optical fiber communications. One of the major issues in OAM-fibers is the OAM-purity degradation provoking intrinsic crosstalk. Both issues are together considered as a manifestation of spin-orbit coupling. In this work, we numerically assess the OAM mode quality in recently proposed OAM-fiber referred as inverse parabolic graded index fiber (IPGIF). Our analysis addresses the purity of OAM modes/channels and the equivalent induced intrinsic crosstalk in IPGIF. This helps to identify the key parameters that have direct impact on the purity performance.