Lightwave applications of fiber Bragg gratings

Giles, C.R.

doi:10.1109/50.618357

Cited by 318 publications

(144 citation statements)

References 48 publications

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“…The zero dispersion response of the grating would be helpful to the fabrication of DWDM optical system reliable even at high power application. At high optical power level (≥ 100 mw), the nonlinear effect may degrade the performance of DWDM system, but by using the proposed larger bandwidth zero dispersion grating may compensate it [9][10][11]. Figure 7 demonstrates how the side lobes have been eliminated Figure 7.…”

Section: Controlling the Dispersion And Peak Reflectivity Due To An Amentioning

confidence: 99%

Dispersion and Peak Reflectivity Analysis in a Non-Uniform FBG Based Sensors Due to Arbitrary Refractive Index Profile

Raghuwanshi¹,

Kumar²,

Srinivas³

2012

PIER B

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Abstract-This paper deals with a group velocity dispersion issue and a peak reflectivity issue in a non-uniform fiber Bragg gratings (FBG) due to an arbitrary refractive index profile along the length of grating. The paper shows that by using more complicated refractive index profile one can significantly reduce the group velocity dispersion and side lobes intensity and that in main lobe the bandwidth of reflectivity would also increase substantially due to a complicated refractive index profile. To the authors' knowledge, there has not been any work reported in this direction. Generally, coupled mode theory is used to analyze the uniform fiber Bragg grating (UFBG). The analysis results in two coupled first order ordinary differential equations with constant coefficients for which closed form solutions can be found for appropriate boundary conditions. Most fiber gratings designed for practical applications however are non uniform. The main reason for using non uniform grating is that it reduces the side lobes in the reflectivity spectrum. Due to the complexity of analysis, no particular method for an analysis of the non-uniform fiber Bragg grating would be found. The two standard approaches for calculating the reflection and transmission spectra of a non uniform FBG are direct numerical integration of coupled mode equations and piecewise uniform approximation approach. The former is more accurate but computationally intensive. In this paper, piecewise uniform approximation approach is used to study a dispersion characteristic due to an arbitrary refractive index profile. The usefulness in FBG based sensors has been demonstrated.

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Section: Controlling the Dispersion And Peak Reflectivity Due To An Amentioning

confidence: 99%

Dispersion and Peak Reflectivity Analysis in a Non-Uniform FBG Based Sensors Due to Arbitrary Refractive Index Profile

Raghuwanshi¹,

Kumar²,

Srinivas³

2012

PIER B

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“…In addition, the refractive index of the fiber core changes because of the thermo-optic effect. Combining all the above effects, the shift in the Bragg wavelength due to a temperature change is given as S,, B / XB = (1 -p e )8l /l + Sn eff /n eff, (1) where p e is the photoelastic constant of the optical fiber and 6l/l is the thermally induced strain of the fiber. In general the photoelastic constant, the fractional index change, and the thermal expansion coefficients of the fiber and the substrate are temperature dependent and nonlinear, especially at low temperatures.…”

Section: Theory Fbg As a Temperature Sensormentioning

confidence: 99%

“…Fiber optic sensors have been extensively studied and proposed for temperature and strain sensing in heath monitoring systems of aerospace structures and materials as well as many other applications [1][2][3]. Compared to other sensors, Fiber optic sensors have the advantages of being light weight and flexible, and requiring simpler wiring especially for distributed sensing.…”

Section: Introductionmentioning

confidence: 99%

Fiber Optic Thermographic Detection of Flaws in Composites

Wu¹,

Winfree²,

Thompson³

et al. 2010

AIP Conference Proceedings

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ABSTRACT. Optical fibers with multiple Bragg gratings bonded to surfaces of structures were used for thermographic detection of subsurface defects in structures. The investigated structures included a 10-ply composite specimen with subsurface delaminations of various sizes and depths. Both during and following the application of a thermal heat flux to the surface, the individual Bragg grating sensors measured the temporal and spatial temperature variations. The obtained data were analyzed with thermal modeling to reveal particular characteristics of the interested areas. These results were found to be consistent with the simulation results.

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“…Because of its special phase-matching resonant mechanism, optical fiber grating has been proved as ideal in-fiber element for wavelength-selective lightwave reflection and filtering in optical fiber communications and sensing applications [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Advances in optical fiber Bragg grating sensor technologies

et al. 2012

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Abstract:The authors review their recent advances in the development of optical fiber Bragg grating (FBG) sensor technologies. After a brief review of the fiber grating sensors, several newly developed FBG sensors are described. With the continuous development of fiber materials, microstructures and post-processing technologies, FBG sensors are still creative after the first demonstration of permanent gratings thirty years ago.

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Lightwave applications of fiber Bragg gratings

Cited by 318 publications

References 48 publications

Dispersion and Peak Reflectivity Analysis in a Non-Uniform FBG Based Sensors Due to Arbitrary Refractive Index Profile

Dispersion and Peak Reflectivity Analysis in a Non-Uniform FBG Based Sensors Due to Arbitrary Refractive Index Profile

Fiber Optic Thermographic Detection of Flaws in Composites

Advances in optical fiber Bragg grating sensor technologies

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