Mode matching in the field speckle pattern after graded-index fibers

TL;DR

This paper introduces a real-time mode matching technique for multimode graded-index fibers using intensity moments, measuring mode spectra, entropy, and coherence to enhance information transmission.

Contribution

It presents a novel method for parallel information transmission in graded-index fibers based on intensity moments and mode spectrum analysis.

Findings

Successful real-time mode matching implementation

Measurement of mode amplitudes, phases, entropy, and coherence

Enhanced understanding of mode behavior in graded-index fibers

Abstract

We have developed and implemented a new technique of parallel information transmission through a multimode graded-index fiber in real time based on the approach of intensity moments. To do this, it was necessary to measure the spectrum of the mode amplitudes and phases in the Hermite-Gauss basis. At the same time, informational entropy and the degree of spatial coherence were measured.