High-sensitivity few-mode long-period fiber grating refractive index sensor based on mode barrier region and phase-matching turning point

Wu, Wenyu; Gu, Zhengtian; Ling, Qiang

doi:10.1016/j.optcom.2020.125997

Cited by 8 publications

(2 citation statements)

References 20 publications

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“…The sensitivity increases about 1.64 times in the process of etching. Wu et al (2020) combined two other methods to obtain an ultra-high SRI sensitivity of 18930 nm/RIU. The results reveal that the FMF-LPFG sensor has the best SRI sensitivity when the surface thickness is near the mode barrier region and the dual dips are close to DTP.…”

Section: The Sri Characteristics Of Fmf-lpfgsmentioning

confidence: 99%

Few-Mode Fiber-Based Long-Period Fiber Gratings: A Review

Chen,

Ma,

et al. 2024

JOPR

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Long-period fiber gratings (LPFGs) are efficient ways to achieve high-order core mode conversion and vortex mode conversion in few-mode fibers (FMFs), which have the benefits of flexible structure, high integration, low insertion loss, and strong wavelength selectivity. With the rapid development of mode division multiplexing (MDM) optical communications, the FMF-LPFGs could have promising applications in the field of MDM optical communications and optical sensors. In this paper, we briefly introduce the principle of optical coupling, theoretical analysis, fabrication techniques, and applications of the FMF-LPFGs in optical communications and optical sensors. The CO2-laser writing technique and arc discharge technique are widely used for the fabrication of FMF-LPFGs and FMF helical long-period gratings (HLPGs). The hydrogen-oxygen flame technique has the advantage on the fabrication of FMF-HLPGs. The mechanical micro-bending and acoustic induction techniques are flexible and effective methods in fundamental researches. The femtosecond laser technique has the advantages for the fabrication of parallel FMF-LPFGs and micro-structure FMF-LPFGs. The mode converters based on the FMF-LPFGs have been demonstrated using different inscription techniques. The FMF-LPFG converters have the advantages such as temperature insensitivity and wavelength tunability. The broadband converters have been demonstrated based on the phase-shift FMF-LPFG, cascaded FMF-LPFGs, and FMF-LPFG operating at dispersion turning point. The FMF-LPFGs and FMF-HLPGs are an excellent option to generate all-fiber orbital angular momentum (OAM) modes in different specialty FMFs, especially the FMF-HLPGs can excite different-order OAM modes directly. As the novel fiber component, the sensing application of FMF-LPFGs and FMF-HLPGs is also briefly introduced.

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Section: The Sri Characteristics Of Fmf-lpfgsmentioning

confidence: 99%

Few-Mode Fiber-Based Long-Period Fiber Gratings: A Review

Chen,

Ma,

et al. 2024

JOPR

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“…As an important optical element, diffraction grating has the properties of dispersion [1][2][3][4][5][6], beam splitting [7][8][9][10][11], polarization [12][13][14][15][16][17] and phase matching [18][19][20][21][22] and shows a wide range of applications in different fields. For example, diffraction gratings with high dispersion and high diffraction efficiency, such as the core components in laser pulse compression [23], laser frequency selection [24] and spectral beam combining [25] are widely used in high-power laser systems.…”

Section: Introductionmentioning

confidence: 99%

Modeling and analysis of bi-function separation under second Bragg incidence by T-type microstructure

Fu¹,

Wang²

2021

Laser Phys.

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A one-port reflector for transverse-electric (TE) polarization and a two-port beam splitter for transverse-magnetic (TM) polarization is proposed by T-type double-layer fused-silica grating. After optimization calculations, 97.87% single-order high-efficiency reflection under TE polarization and 48.70%/48.71% highly uniform dual-order beam splitting under TM polarization are finally obtained. In addition, the normalized electric field and magnetic field diagrams of the grating are obtained using the finite element method. Finally, the incident characteristics and process tolerances of the grating are analyzed, and a range of structural parameters that meets good reflection efficiency is found. The design and study of polarization-dependent gratings carried out in this paper are of great significance for increasing the output power of laser systems and improving the stability of optical devices when unpolarized lasers are incident.

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Design of high sensitivity refractive index sensor based on small chirp coefficient LPFG

Jiang

2022

Opt Quant Electron

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High-sensitivity few-mode long-period fiber grating refractive index sensor based on mode barrier region and phase-matching turning point

Cited by 8 publications

References 20 publications

Few-Mode Fiber-Based Long-Period Fiber Gratings: A Review

Few-Mode Fiber-Based Long-Period Fiber Gratings: A Review

Modeling and analysis of bi-function separation under second Bragg incidence by T-type microstructure

Design of high sensitivity refractive index sensor based on small chirp coefficient LPFG

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