Numerical and Experimental Study of Mode Coupling Due to Localised Few-Mode Fibre Bragg Gratings and a Spatial Mode Multiplexer
James Hainsworth, Adriana Morana, Lucas Lescure, Philippe Veyssiere, Sylvain Girard, Emmanuel Marin
TL;DR
This paper studies how adding a spatial mode multiplexer can simplify the use of few-mode fibre Bragg gratings in sensing applications.
Contribution
The paper introduces a novel multiplexing technique based on transverse location and modal content in few-mode fibres.
Findings
A spatial mode multiplexer slightly simplifies the transmission spectrum of few-mode FBGs.
Modal filtering after reflection enables WDM monitoring of FM-FBGs.
A new multiplexing approach based on transverse location and initial modal coupling is reported.
Abstract
Mode conversion effects in Fibre Bragg Gratings (FBGs) are widely exploited in applications such as sensing and fibre lasers. However, when FBGs are inscribed into Few-mode optical Fibres (FMFs), the mode interactions become highly complex due to the increased number of guided modes, rendering their practical use difficult. In this study, we investigate whether the addition of a spatial mode multiplexer, used to selectively excite specific fibre modes, can simplify the interpretation and utility of few-mode FBGs (FM-FBGs). We focus on point-by-point (PbP)-inscribed FBGs, localised with respect to the transverse cross-section of the fibre core, and study their interaction with a range of Hermitian Gauss input modes. We present a comprehensive numerical study supported by experimental validation, examining the mechanisms of mode coupling induced by localised FBGs and its implications,…
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Taxonomy
TopicsAdvanced Fiber Optic Sensors · Advanced Fiber Laser Technologies · Photonic Crystal and Fiber Optics