Intermodal Raman Scattering between Orbital Angular Momentum Modes in Optical Fibers

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Abstract

This paper presents an experimental and theoretical analysis of Raman amplification of OAM modes i.e. beams carrying orbital angular momentum and spin angular momentum. We show that simple scalar equations are sufficient to describe the Raman interaction between OAM modes when working in a cyclic basis. The equations are similar to those used when considering Raman amplification in conventional fibers used for optical communication. Such fibers are typically single mode and support propagation of LP modes i.e. light that is linearly polarized. In fibers that support propagation of OAM modes as well as in fibers that support propagation of LP modes the scalar equations apply when considering very short- fiber lengths or long fiber lengths, only the proper gain efficiency needs to be used. Here, we discuss the gain efficiency, its material and modal dependencies and we demonstrate that the Raman gain efficiency among OAM modes in comparison with the efficiency among LP modes mainly differs due to a typically larger mode size of OAM modes relative to that of the fundamental LP modes in conventional fibers used for optical communication. In addition, we demonstrate a mode dependent loss in an optical fibers that support propagation of OAM modes.
Original languageEnglish
Title of host publicationProceedings of 22nd International Conference on Transparent Optical Networks
Number of pages4
PublisherIEEE
Publication date2020
ISBN (Print)978-1-7281-8424-1
DOIs
Publication statusPublished - 2020
Event22nd International Conference on Transparent Optical Networks - Virtual event, Bari, Italy
Duration: 19 Jul 202023 Jul 2020
Conference number: 22
https://icton2020.fbk.eu/
https://icton2020.fbk.eu/home

Conference

Conference22nd International Conference on Transparent Optical Networks
Number22
LocationVirtual event
Country/TerritoryItaly
CityBari
Period19/07/202023/07/2020
Internet address
Series 2012 14th International Conference on Transparent Optical Networks (ICTON)
ISSN2161-2056

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