Line Position-Dependent Effect in Line-by-Line Inscribed Fiber Bragg Gratings

Line-by-line direct writing by femtosecond laser has been proved to be a simple and effective method for the fabrication of low-loss fiber Bragg gratings (FBGs), and is more flexible compared with the traditional ultraviolet exposure method. In this paper, the line-position-dependent characteristics...

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Autores principales:	Hongye Li, Xiaofan Zhao, Binyu Rao, Meng Wang, Baiyi Wu, Zefeng Wang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	femtosecond laser fiber Bragg gratings cladding mode apodization Chemical technology TP1-1185
Acceso en línea:	https://doaj.org/article/dc96f700bda941ddabecef02fc896ca5
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spelling	oai:doaj.org-article:dc96f700bda941ddabecef02fc896ca52021-11-11T19:12:24ZLine Position-Dependent Effect in Line-by-Line Inscribed Fiber Bragg Gratings10.3390/s212172311424-8220https://doaj.org/article/dc96f700bda941ddabecef02fc896ca52021-10-01T00:00:00Zhttps://www.mdpi.com/1424-8220/21/21/7231https://doaj.org/toc/1424-8220Line-by-line direct writing by femtosecond laser has been proved to be a simple and effective method for the fabrication of low-loss fiber Bragg gratings (FBGs), and is more flexible compared with the traditional ultraviolet exposure method. In this paper, the line-position-dependent characteristics of cladding modes coupling in line-by-line FBGs have been studied, to the best of our knowledge, for the first time. Both theoretical and experimental results show that off-center inscribing could compress the bandwidth of the Bragg resonance and excite more abundant cladding mode coupling, in which the core-guided fundamental mode would couple to the cladding-guided LP0n and LP1n simultaneously. By aligning the line positions across the core region, the first apodized line-by-line FBG was achieved. This work enriches the theories of line-by-line FBGs and provides an inscription guidance to meet different application requirements.Hongye LiXiaofan ZhaoBinyu RaoMeng WangBaiyi WuZefeng WangMDPI AGarticlefemtosecond laserfiber Bragg gratingscladding modeapodizationChemical technologyTP1-1185ENSensors, Vol 21, Iss 7231, p 7231 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	femtosecond laser fiber Bragg gratings cladding mode apodization Chemical technology TP1-1185
spellingShingle	femtosecond laser fiber Bragg gratings cladding mode apodization Chemical technology TP1-1185 Hongye Li Xiaofan Zhao Binyu Rao Meng Wang Baiyi Wu Zefeng Wang Line Position-Dependent Effect in Line-by-Line Inscribed Fiber Bragg Gratings
description	Line-by-line direct writing by femtosecond laser has been proved to be a simple and effective method for the fabrication of low-loss fiber Bragg gratings (FBGs), and is more flexible compared with the traditional ultraviolet exposure method. In this paper, the line-position-dependent characteristics of cladding modes coupling in line-by-line FBGs have been studied, to the best of our knowledge, for the first time. Both theoretical and experimental results show that off-center inscribing could compress the bandwidth of the Bragg resonance and excite more abundant cladding mode coupling, in which the core-guided fundamental mode would couple to the cladding-guided LP0n and LP1n simultaneously. By aligning the line positions across the core region, the first apodized line-by-line FBG was achieved. This work enriches the theories of line-by-line FBGs and provides an inscription guidance to meet different application requirements.
format	article
author	Hongye Li Xiaofan Zhao Binyu Rao Meng Wang Baiyi Wu Zefeng Wang
author_facet	Hongye Li Xiaofan Zhao Binyu Rao Meng Wang Baiyi Wu Zefeng Wang
author_sort	Hongye Li
title	Line Position-Dependent Effect in Line-by-Line Inscribed Fiber Bragg Gratings
title_short	Line Position-Dependent Effect in Line-by-Line Inscribed Fiber Bragg Gratings
title_full	Line Position-Dependent Effect in Line-by-Line Inscribed Fiber Bragg Gratings
title_fullStr	Line Position-Dependent Effect in Line-by-Line Inscribed Fiber Bragg Gratings
title_full_unstemmed	Line Position-Dependent Effect in Line-by-Line Inscribed Fiber Bragg Gratings
title_sort	line position-dependent effect in line-by-line inscribed fiber bragg gratings
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/dc96f700bda941ddabecef02fc896ca5
work_keys_str_mv	AT hongyeli linepositiondependenteffectinlinebylineinscribedfiberbragggratings AT xiaofanzhao linepositiondependenteffectinlinebylineinscribedfiberbragggratings AT binyurao linepositiondependenteffectinlinebylineinscribedfiberbragggratings AT mengwang linepositiondependenteffectinlinebylineinscribedfiberbragggratings AT baiyiwu linepositiondependenteffectinlinebylineinscribedfiberbragggratings AT zefengwang linepositiondependenteffectinlinebylineinscribedfiberbragggratings
_version_	1718431614488281088

Line Position-Dependent Effect in Line-by-Line Inscribed Fiber Bragg Gratings

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