Optical Fiber Long-Period Grating Sensors

Bhatia, Vikram; D'Alberto, Tiffanie; Murphy, Kent A.; Claus, Richard O.; Vensarkar, Ashish M.

doi:10.1364/ofs.1996.we43

Cited by 89 publications

(124 citation statements)

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“…The modulation of the core refractive index has been achieved by ultraviolet (UV) irradiation [7]- [10], ion implantation [11],and irradiation by femtosecond pulses in the infrared [12], irradiation by CO 2 lasers [13][14], diffusion of dopants into the core [15][16], relaxation of mechanical stress [17] and electrical discharges [18][19]. The deformation of the fiber has been achieved mechanically [20][21], by tapering the fiber [22] or by deformation of the core [23][24] or cladding [25].…”

Section: Vgrating Fabricationmentioning

confidence: 99%

A Review on Optical Fiber Long Period Grating, its applications in Optical Communication System

Sehgal¹,

Dua²

2015

International Journal of Advanced Research in Computer and Comm

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Innovations in optical fiber technology are revolutionizing world communications. As we can se that optical fiber long period grating can be used in designing of devices which are used to meet the growing demands for various ranges in the field of optical communication systems. Thus, this paper deals with the descriptive study of long period fiber grating (LPG) and its applications in emerging field of optical communication systems. LPG forms an important component of optical communication. The paper covers the analysis of long fiber grating and their fabrication. This paper also deals with the cladding mode analysis of the fiber which describes the inaccuracies of two layer model of the fiber and implementation of three layer fiber geometry to calculate the effective refractive index of the fiber so that it can effectively couple the signal for its efficient transmission. In the cladding mode analysis the whole mathematical derivation along with the requisite mathematical expressions are explained to find the effective refractive indices of the various cladding modes being supported by the fiber which are used to plot the transmission spectrum of the LPG designed for a particular frequency or wavelength used for telecommunication purposes.

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Section: Vgrating Fabricationmentioning

confidence: 99%

A Review on Optical Fiber Long Period Grating, its applications in Optical Communication System

Sehgal¹,

Dua²

2015

International Journal of Advanced Research in Computer and Comm

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“…An approach was made of using Long Period Fiber Gratings (LPFGs) to bending measurements by embedding a sensing structure into a composite laminate, but LPFGs present cross-sensitivities between different physical parameters such as pressure, strain and temperature [13,14]. The reduction of temperature cross-sensitivity may be obtained by using a hybrid structure consisting of an LPFG and tilted Bragg grating for curvature measurements [15].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Fibre Bending on Polarization-Dependent Twist Sensor Based on Tilted Bragg Grating

Harasim

2017

Metrology and Measurement Systems

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This paper presents an experimental study on influence of input light polarization on the spectral characteristics of a fibre twist sensor based on Tilted Fiber Bragg Grating (TFBG) with simultaneous application of bending to an optical fibre. The application of proposed measurement stand could provide the ability of transforming the bending to a displacement. The twist measurement was performed by tuning of the sensor illuminating light polarization angle. The spectral parameters of selected cladding mode which are sensitive to the rotation of input light polarization angle have been shown. This paper shows the characteristics of transmittivity and wavelength shift for an incident high-order cladding mode measured with different curvatures of fibre. The dependency of selected cladding mode spectral parameters related with the twist measurement on the influence of temporary bending has been shown. The measurements were performed for two positions of sensing structure refractive index perturbations in relation to the bending direction plane. The experimental results show that the direction of TFBG structure bending has a small influence on the stability of spectral parameters characteristic for twist measurement, assuming that the bending direction is fixed while measurement.

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“…Long period fiber grating (LPFG) has drawn much attention in the development of optical devices [1,2] and sensors [3]. In particular, the LPFGs are of great interest in sensorapplications because the resonance condition is very sensitive to various measurands: strain, curvature, external refractive index, and temperature.…”

Section: Introductionmentioning

confidence: 99%

Investigation of an Arc-induced Long Period Fiber Grating Inscribed in a Photonic Crystal Fiber with Two Large Air Holes

Kim¹,

Kim²,

Hwang³

et al. 2009

Journal of the Optical Society of Korea

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A photonic crystal fiber with two large air holes outside the holey cladding region is fabricated to induce an effective long periodic grating (LPG) in the core by an electric arc discharge. We believe that the two large air holes lead to the asymmetric perturbation in the core under the electric arc discharge, thereby introducing the coupling to the first higher-order mode. The transmission characteristics of the PCF with the LPG for the external perturbation such as strain, curvature, and temperature are also investigated. It was found that the shift of resonance peak in the transmission spectrum depends on the bending direction. The curvature of 8.55 m -1 results in the center wavelength shifts of 1.8, 4.3, and 11 nm for a vertical, diagonal, and horizontal direction of the curvature to the large air-hole alignment, respectively.

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Optical Fiber Long-Period Grating Sensors

Cited by 89 publications

References 0 publications

A Review on Optical Fiber Long Period Grating, its applications in Optical Communication System

A Review on Optical Fiber Long Period Grating, its applications in Optical Communication System

The Influence of Fibre Bending on Polarization-Dependent Twist Sensor Based on Tilted Bragg Grating

Investigation of an Arc-induced Long Period Fiber Grating Inscribed in a Photonic Crystal Fiber with Two Large Air Holes

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