Simulation of the Transmission Spectrum of Long-Period Fiber Gratings Structures with a Propagating Acoustic Shock Front

In this paper, we investigate modification of transmission spectra of long-period fiber grating structures with an acoustic shock front propagating along the fiber. We simulate transmission through inhomogeneous long-period fiber gratings, π-shift and reflective π-shift gratings deformed by an acous...

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Autores principales:	Oleg V. Ivanov, Paulo Caldas, Gaspar Rego
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	long-period fiber grating optical spectrum fiber optics sensor shock wave shock front Chemical technology TP1-1185
Acceso en línea:	https://doaj.org/article/d049b315d0f0440594b633ef131b63df
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spelling	oai:doaj.org-article:d049b315d0f0440594b633ef131b63df2021-11-11T19:11:34ZSimulation of the Transmission Spectrum of Long-Period Fiber Gratings Structures with a Propagating Acoustic Shock Front10.3390/s212172121424-8220https://doaj.org/article/d049b315d0f0440594b633ef131b63df2021-10-01T00:00:00Zhttps://www.mdpi.com/1424-8220/21/21/7212https://doaj.org/toc/1424-8220In this paper, we investigate modification of transmission spectra of long-period fiber grating structures with an acoustic shock front propagating along the fiber. We simulate transmission through inhomogeneous long-period fiber gratings, π-shift and reflective π-shift gratings deformed by an acoustic shock front. Coupled mode equations describing interaction of co-propagating modes in a long-period fiber grating structures with inhomogeneous deformation are used for the simulation. Two types of apodization are considered for the grating modulation amplitude, such as uniform and raised-cosine. We demonstrate how the transmission spectrum is produced by interference between the core and cladding modes coupled at several parts of the gratings having different periods. For the π-shift long-period fiber grating having split spectral notch, the gap between the two dips becomes several times wider in the grating with the acoustic wave front than the gap in the unstrained grating. The behavior of reflective long-period fiber gratings depends on the magnitude of the phase shift near the reflective surface: an additional dip is formed in the 0-shift grating and the short-wavelength dip disappears in the π-shift grating.Oleg V. IvanovPaulo CaldasGaspar RegoMDPI AGarticlelong-period fiber gratingoptical spectrumfiber optics sensorshock waveshock frontChemical technologyTP1-1185ENSensors, Vol 21, Iss 7212, p 7212 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	long-period fiber grating optical spectrum fiber optics sensor shock wave shock front Chemical technology TP1-1185
spellingShingle	long-period fiber grating optical spectrum fiber optics sensor shock wave shock front Chemical technology TP1-1185 Oleg V. Ivanov Paulo Caldas Gaspar Rego Simulation of the Transmission Spectrum of Long-Period Fiber Gratings Structures with a Propagating Acoustic Shock Front
description	In this paper, we investigate modification of transmission spectra of long-period fiber grating structures with an acoustic shock front propagating along the fiber. We simulate transmission through inhomogeneous long-period fiber gratings, π-shift and reflective π-shift gratings deformed by an acoustic shock front. Coupled mode equations describing interaction of co-propagating modes in a long-period fiber grating structures with inhomogeneous deformation are used for the simulation. Two types of apodization are considered for the grating modulation amplitude, such as uniform and raised-cosine. We demonstrate how the transmission spectrum is produced by interference between the core and cladding modes coupled at several parts of the gratings having different periods. For the π-shift long-period fiber grating having split spectral notch, the gap between the two dips becomes several times wider in the grating with the acoustic wave front than the gap in the unstrained grating. The behavior of reflective long-period fiber gratings depends on the magnitude of the phase shift near the reflective surface: an additional dip is formed in the 0-shift grating and the short-wavelength dip disappears in the π-shift grating.
format	article
author	Oleg V. Ivanov Paulo Caldas Gaspar Rego
author_facet	Oleg V. Ivanov Paulo Caldas Gaspar Rego
author_sort	Oleg V. Ivanov
title	Simulation of the Transmission Spectrum of Long-Period Fiber Gratings Structures with a Propagating Acoustic Shock Front
title_short	Simulation of the Transmission Spectrum of Long-Period Fiber Gratings Structures with a Propagating Acoustic Shock Front
title_full	Simulation of the Transmission Spectrum of Long-Period Fiber Gratings Structures with a Propagating Acoustic Shock Front
title_fullStr	Simulation of the Transmission Spectrum of Long-Period Fiber Gratings Structures with a Propagating Acoustic Shock Front
title_full_unstemmed	Simulation of the Transmission Spectrum of Long-Period Fiber Gratings Structures with a Propagating Acoustic Shock Front
title_sort	simulation of the transmission spectrum of long-period fiber gratings structures with a propagating acoustic shock front
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/d049b315d0f0440594b633ef131b63df
work_keys_str_mv	AT olegvivanov simulationofthetransmissionspectrumoflongperiodfibergratingsstructureswithapropagatingacousticshockfront AT paulocaldas simulationofthetransmissionspectrumoflongperiodfibergratingsstructureswithapropagatingacousticshockfront AT gasparrego simulationofthetransmissionspectrumoflongperiodfibergratingsstructureswithapropagatingacousticshockfront
_version_	1718431612411052032

Simulation of the Transmission Spectrum of Long-Period Fiber Gratings Structures with a Propagating Acoustic Shock Front

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