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Encircled Angular Flux Representation of the Modal Power Distribution and its Behavior in a Step Index Multimode Fiber

Kagami, M; Kawasaki, A; Yonemura, M; Nakai, M; Mena, PV; Selviah, DR; (2016) Encircled Angular Flux Representation of the Modal Power Distribution and its Behavior in a Step Index Multimode Fiber. IEEE/OSA Journal of Lightwave Technology , 34 (3) pp. 943-951. 10.1109/JLT.2016.2516644. Green open access

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Abstract

The optical properties of in-line optical components inserted at the input to a multimode optical fiber (MMF) strongly affect the propagating modal power distribution (MPD). To realize stable systems with predictable reproducible performance and to encourage widespread use of MMF systems, improvements to the system design process and to the characterization process need to be made and new interface standards need to be defined. To this end, we have developed a new reproducible MPD measurement and representation together with its theoretical definition. By modifying the encircled flux (EF) representation, which is based on the near-field pattern of a graded-index multimode optical fiber (GI-MMF), we define the encircled angular flux (EAF) for step-index multimode optical fibers (SI-MMFs) based on their far-field patterns (FFPs). Using a SI-MMF, which is used for low cost short distance interconnects, as an example, we show the changes in the MPD along the fiber, reveal an unusual insertion loss-increasing phenomenon due to the evanescent tails of the core modes extending into the cladding, and characterize the equilibrium mode distribution (EMD) in the fiber. The EAF representation enables these phenomena to be quantified. We also propose an EAF template that consists of the target EMD and its tolerance. If device system designers use the EAF template to set the launch conditions, they can perform a fair assessment of the components, and they can design the system performance even if some components are replaced with others from a different supplier manufactured by a different method. We call this concept “Total MPD Management.”

Type: Article
Title: Encircled Angular Flux Representation of the Modal Power Distribution and its Behavior in a Step Index Multimode Fiber
Location: USA
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/JLT.2016.2516644
Publisher version: http://dx.doi.org/10.1109/JLT.2016.2516644
Language: English
Additional information: © 2016 IEEE. Translations and content mining are permitted for academic research only. Personal use is also permitted, but republication/redistribution requires IEEE permission. See http://www.ieee.org/publicationsstandards/publications/rights/index.html for more information.
Keywords: Short Reach, Very short reach, Multimode, Optical Fibrers, Restricted launch, Overfilled Launch, offset launch, equilibrium mode distribution, EMD, MMF, Encircled Flux, EF, Encircled Angular Flux, EAF, Step Index, HPCF, Plastic optical fiber, POF, PCF
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1473916
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