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The effect of periodicity on the defect modes of large mode area microstructured fibers.

Authors
Type
Published Article
Journal
Optics Express
1094-4087
Publisher
The Optical Society
Publication Date
Volume
16
Issue
23
Pages
18631–18645
Identifiers
PMID: 19581949
Source
Medline

Abstract

It is well known that periodic variations in refractive index can be used to create guidance in an optical fiber via photonic bandgap effects. It has also been shown that periodic structure in index-guiding microstructured fibers can lead to the guidance of additional leaky higher-order modes due to bandgap effects. Here we demonstrate that this additional guidance mechanism can have important practical implications in large mode area silica microstructured fibers. We also demonstrate that similar modes can exist when a bandgap is not present and attribute this guidance to a low density of states. Excellent agreement between theoretical predictions and experimental observations is demonstrated. We explore the impact of these additional modes on the practical operation of these fibers and explore ways of minimizing their effects via the fiber geometry.

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