Fabrication of Bragg Gratings

Kashyap, Raman

doi:10.1016/b978-0-12-372579-0.00003-x

Cited by 13 publications

(6 citation statements)

References 107 publications

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“…Fibre Bragg gratings (FBGs) are periodic/aperiodic modulations in the refractive index of a fibre induced by laterally exposing its core with a UV laser [ 24 ]. These gratings behave as a wavelength selective mirror that acts as a spectral bandpass filter in reflection and a bandstop filter in transmission.…”

Section: Theorymentioning

confidence: 99%

Assessment of the Measurement Performance of the Multimodal Fibre Optic Shape Sensing Configuration for a Morphing Wing Section

Nazeer

Groves

Benedictus

2022

Sensors

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In this paper, with the final aim of shape sensing for a morphing aircraft wing section, a developed multimodal shape sensing system is analysed. We utilise the method of interrogating a morphing wing section based on the principles of both hybrid interferometry and Fibre Bragg Grating (FBG) spectral sensing described in our previous work. The focus of this work is to assess the measurement performance and analyse the errors in the shape sensing system. This includes an estimation of the bending and torsional deformations of an aluminium mock-up section due to static loading that imitates the behaviour of a morphing wing trailing edge. The analysis involves using a detailed calibration procedure and a multimodal sensing algorithm to measure the deflection and shape. The method described In this paper, uses a standard single core optical fibre and two grating pairs on both the top and bottom surfaces of the morphing section. A study on the fibre placement and recommendations for efficient monitoring is also included. The analysis yielded a maximum deflection sensing error of 0.7 mm for a 347 × 350 mm wing section.

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Section: Theorymentioning

confidence: 99%

Assessment of the Measurement Performance of the Multimodal Fibre Optic Shape Sensing Configuration for a Morphing Wing Section

Nazeer

Groves

Benedictus

2022

Sensors

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“…As transmitted optical signal contains different wavelength components and these optical signal components will be reflected, depending on the wavelength, at different positions along the grating, it is possible to use this ability to compensate CD. Dispersion compensation using FBG has some advantages over DCF, for example, FBG is smaller in size physically, exhibits relatively small insertion loss and causes negligible nonlinearities [4]. FBG ideally is suited for individual wavelength compensation rather than multiple wavelengths, but, in contrast, DCF is better suited for compensation over a wide range of wavelengths.…”

Section: Dispersion Compensation Methodsmentioning

confidence: 99%

“…There are many methods how to compensate CD, but two the most popular methods are dispersion shifted fibre (DCF) and fibre Bragg grating (FBG) [3]- [4]. DCF and FBG detailed explanation are written in the second section.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Chromatic Dispersion Compensation Method Efficiency for 10 Gbit/S RZ-OOK and NRZ-OOK Wdm-Pon Transmission Systems

Alsevska

Dilendorfs

Spolītis

et al. 2017

Latvian Journal of Physics and Technical Sciences

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In the paper, the authors compare efficiency of two physical dispersion compensation methods for single channel and 8-channel WDM fibreoptical transmission systems using return-to-zero (RZ) and non-return-to-zero (NRZ) line codes for operation within optical C-band frequencies by means of computer simulations. As one of the most important destructive effects in fibre optical transmission systems (FOTS) is chromatic dispersion (CD), it is very important to reduce its negative effect on a transmitted signal. Dispersion compensation methods that were implemented in the research were dispersion compensating fibre (DCF) and fibre Bragg grating (FBG). The main goal of the paper was to find out which dispersion compensation method (DCF or FBG) provided the highest performance increase for fibre-optical transmission system and provided the longest transmission distance after dispersion compensation was implemented at different locations in the fibre-optical line while RZ or NRZ line codes were used. In the paper the reference point of signal quality for all measurements, which were obtained at the receiver, was BER<10 -12 .

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“…It is shown in 5-6 that non-uniform LPFGs have better linearity in measuring the external refractive index, but the design and fabrication of such LPFGs is more complex. Secondly, the LPFG are commonly manufactured by point-by-point technique [1][2]10 . Any form of this technique features some systematic and random fabrication errors.…”

Section: Introductionmentioning

confidence: 99%

Fabrication tolerances in long-period fiber grating refractometric sensors

Beltrán-Hernández

Khotiaintsev

2013

SPIE Proceedings

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This work focuses on the results and analyses performed on long-period optical-fiber gratings (LPFG) designed for use as refractometric sensors. The study was conducted with non-uniform LPFG specially designed for refractometric applications. First, LPFG transmission spectra were calculated for nominal period, propagation constant of the cladding mode and phase shift between the adjacent LPFG sections. Then, a random variation of the above parameters was introduced and the effect of this variation on the transmission spectrum of the LPFG, with the external refractive index as parameter, was evaluated. Finally, a change in the resonant wavelength against the external refractive index was investigated under random variation of parameters. We have found that in some long-period fiber grating refractometric sensors fabrication tolerances should as stringent as 0.2 % of nominal parameter. The methodology of tolerance analysis and quantitative data obtained in this work might be useful in establishing tolerances for fabrication parameters of longperiod fiber grating refractometric sensors.

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Fabrication of Bragg Gratings

Cited by 13 publications

References 107 publications

Assessment of the Measurement Performance of the Multimodal Fibre Optic Shape Sensing Configuration for a Morphing Wing Section

Assessment of the Measurement Performance of the Multimodal Fibre Optic Shape Sensing Configuration for a Morphing Wing Section

Comparison of Chromatic Dispersion Compensation Method Efficiency for 10 Gbit/S RZ-OOK and NRZ-OOK Wdm-Pon Transmission Systems

Fabrication tolerances in long-period fiber grating refractometric sensors

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