Determination of the mode composition of optical radiation from the reflection spectrum of multimode fiber Bragg grating

IF 2 3区物理与天体物理 Q3 OPTICS

Applied Physics B Pub Date : 2024-12-24 DOI:10.1007/s00340-024-08373-z

Foat R. Iakupov, Fedor V. Zakharov, Andrey I. Baranov, Renat I. Shaidullin

引用次数: 0

Abstract

A novel approach for the reconstruction of the mode composition of optical radiation in multimode fiber is presented. It is based on the analysis of the reflection spectrum from the multimode fiber Bragg grating. The mode composition of radiation in the multimode fiber with 40 µm core diameter, sustaining 17 transverse LP modes, was experimentally studied. The experimentally obtained spectral reflection peaks from the multimode fiber Bragg grating coincide very well with the theoretically calculated ones. At the same time, additional spectral peaks corresponding to the cross-reflection of some modes into others were discovered. The introduced method also made it possible to determine the parameters of the studied multimode fiber Bragg grating. Furthermore, the presented method allows the determination of the bending losses for different transverse modes of radiation. The obtained results can help to characterize the operation of few-mode or multimode laser systems.

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多模光纤布拉格光栅反射光谱中光辐射模式组成的测定

提出了一种重建多模光纤中光辐射模式组成的新方法。它是基于对多模光纤布拉格光栅反射光谱的分析。实验研究了芯径为40µm的多模光纤中17个横向LP模的辐射模组成。实验得到的多模光纤布拉格光栅的光谱反射峰与理论计算值吻合较好。同时，还发现了一些模式对其他模式的交叉反射所对应的附加光谱峰。该方法还使所研究的多模光纤布拉格光栅的参数确定成为可能。此外，提出的方法可以确定不同的横向模式的辐射弯曲损失。所得结果有助于表征少模或多模激光系统的工作特性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics B 物理-光学

CiteScore

4.00

自引率

4.80%

发文量

202

审稿时长

3.0 months

期刊介绍： Features publication of experimental and theoretical investigations in applied physics Offers invited reviews in addition to regular papers Coverage includes laser physics, linear and nonlinear optics, ultrafast phenomena, photonic devices, optical and laser materials, quantum optics, laser spectroscopy of atoms, molecules and clusters, and more 94% of authors who answered a survey reported that they would definitely publish or probably publish in the journal again Publishing essential research results in two of the most important areas of applied physics, both Applied Physics sections figure among the top most cited journals in this field. In addition to regular papers Applied Physics B: Lasers and Optics features invited reviews. Fields of topical interest are covered by feature issues. The journal also includes a rapid communication section for the speedy publication of important and particularly interesting results.