Talbot interference of whispering gallery modes
Matias Eriksson, Benjamin A. Stickler, Robert Fickler

TL;DR
This paper explores the Talbot interference effect in whispering gallery modes within multimode fibers, demonstrating fractional Talbot effects for optical beam splitting and multiplexing using accessible components.
Contribution
It introduces the use of whispering gallery modes in step-index multimode fibers to realize high-order fractional Talbot effects for optical beam splitting and multiplexing.
Findings
Demonstrated 9- and 30-port beamsplitters using fractional Talbot effect
Achieved efficient interfacing with single-mode fibers for signal multiplexing
Extended Talbot effect applications to widely available multimode fibers
Abstract
The Talbot self-imaging phenomenon is a fundamental interference effect that is natural to all waves with a periodic structure. We theoretically and experimentally study the Talbot effect for optical waves in the transverse angular domain using whispering-gallery modes of step-index multimode fibers, which carry a high orbital angular momentum and fulfill the required quadratic dispersion relation. By using the complex interference along the core-cladding interface of these fibers, we experimentally demonstrate that the high-order fractional Talbot effect can be used to implement 9- and 30-port beamsplitters using only off-the-shelf components in a compact arrangement. In addition, we show that the beamsplitters can be efficiently interfaced with single-mode fibers, such that our work not only extends the recent developments on the angular Talbot effect to widely available step-index…
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Taxonomy
TopicsAdvanced Photonic Communication Systems · Advanced Optical Imaging Technologies · Advanced Optical Sensing Technologies
