Long Period Fibre Gratings

Martı́nez-Rios, A.; Monzón-Hernández, David; Torres-Gómez, I.; Salceda-Delgado, G.

doi:10.5772/27727

Cited by 11 publications

(7 citation statements)

References 35 publications

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“…A point-based sensor has the ability of multiplexing, which can be used in distributed sensing of external perturbations. Depending on the gratings formed, fiber Bragg gratings can be uniform FBG, 3 chirped FBG, 23,24 tilted FBG, 25,26 long grating fiber, [27][28][29] phase-shifted FBG, 30,31 or super-structured FBG. 19 These gratings are usually inscribed in silica-based fiber but many research studies have been carried out on inscribing FBG in microstructured optical fiber (MOF) forming a microstructure FBG 32,33 or polymer-based FBG 34 that can offer unique Sahota, Gupta and Dhawan: Fiber Bragg grating sensors for monitoring of physical parameters.…”

Section: Optical Engineeringmentioning

confidence: 99%

Fiber Bragg grating sensors for monitoring of physical parameters: a comprehensive review

2020

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Fiber Bragg grating has embraced the area of fiber optics since the early days of its discovery, and most fiber optic sensor systems today make use of fiber Bragg grating technology. Researchers have gained enormous attention in the field of fiber Bragg grating (FBG)-based sensing due to its inherent advantages, such as small size, fast response, distributed sensing, and immunity to the electromagnetic field. Fiber Bragg grating technology is popularly used in measurements of various physical parameters, such as pressure, temperature, and strain for civil engineering, industrial engineering, military, maritime, and aerospace applications. Nowadays, strong emphasis is given to structure health monitoring of various engineering and civil structures, which can be easily achieved with FBG-based sensors. Depending on the type of grating, FBG can be uniform, long, chirped, tilted or phase shifted having periodic perturbation of refractive index inside core of the optical fiber. Basic fundamentals of FBG and recent progress of fiber Bragg grating-based sensors used in various applications for temperature, pressure, liquid level, strain, and refractive index sensing have been reviewed. A major problem of temperature cross sensitivity that occurs in FBG-based sensing requires temperature compensation technique that has also been discussed in this paper.

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Section: Optical Engineeringmentioning

confidence: 99%

Fiber Bragg grating sensors for monitoring of physical parameters: a comprehensive review

2020

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“…PMTPs have been written in conventional single mode and doped fibres [12,11,33,34,36,39], and have been theoretically investigated using photonic crystal fibres [23]. The length of an LPG tends to range from 30 to 50 mm and have refractive index changes of around 10 -4 [40]. Coelho et al [41] calculated a refractive index change in the order of 2 × 10 −4 and 3 × 10 −4 for the core and cladding, respectively when writing an LPG in a single mode fibre using mid-infrared laser radiation.…”

Section: Fabricationmentioning

confidence: 99%

Optical Fibre Long-Period Grating Sensors Operating at and around the Phase Matching Turning Point

Wong¹,

Juan²,

Ibsen³

et al. 2019

Applications of Optical Fibers for Sensing

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Optical fibres have been exploited as sensors for many years and they provide a versatile platform with a small form factor. Long-period gratings (LPGs) operating at and around the phase matching turning point (PMTP) possess some of the highest sensitivities to external perturbations in the family of LPG-based sensor devices. This type of optical fibre grating has been demonstrated as a sensor for use in a wide range of applications. In this review chapter, an overview of PMTP LPGs is presented and the key developments, findings and applications are highlighted. The fabrication considerations and sensor limitations are also discussed.

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“…Since the coupling from the fundamental mode to cladding modes is wavelength-dependent, spectrally selective loss filters, based on LPFGs, can be produced. Long-period gratings are fabricated in optical fibers by applying the point-by-point technique or interferometric pattern using UV, NIR, or CO 2 CW or pulsed laser irradiation, or by the periodic application of heat, pressure, or geometric modulation, among other methods [16].…”

Section: Introductionmentioning

confidence: 99%

Determination of the Mueller matrix of UV-inscribed long-period fiber grating

et al. 2014

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An explicit method for determination of the Mueller matrix elements of a commercial long-period fiber grating inscribed with ultraviolet CW laser irradiation (UV-LPFG) is presented. From the Mueller matrix obtained for such UV-LPFG, the full polarimetric response of the grating was found. Our polarimetric analysis was focused mainly on the polarization-dependent loss and other polarimetric properties, such as the polarizance, the depolarization index, and the diattenuation parameters. The full polarimetric analysis allows us to obtain more complete information than the usually reported ones, in which only two orthogonal linear polarizations are considered; for example, with our analysis, we prove that a small depolarization effect is inherent in UV-LPFG and that attenuation depends on the polarization state. This additional polarimetric information could be useful to control the output LPFG signal, for instance, for the realization of wavelength switchable or Q-switched fiber lasers, among other applications.

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Long Period Fibre Gratings

Cited by 11 publications

References 35 publications

Fiber Bragg grating sensors for monitoring of physical parameters: a comprehensive review

Fiber Bragg grating sensors for monitoring of physical parameters: a comprehensive review

Optical Fibre Long-Period Grating Sensors Operating at and around the Phase Matching Turning Point

Determination of the Mueller matrix of UV-inscribed long-period fiber grating

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