Spectral characterization of differential group delay in uniform fiber Bragg gratings

Bette, Sébastien; Caucheteur, Christophe; Wuilpart, Marc; Mégret, Patrice; Garcia-Olcina, R.; Sales, Salvador; Capmany, J.

doi:10.1364/opex.13.009954

Cited by 35 publications

(7 citation statements)

References 10 publications

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“…Therefore, the total FBG spectrum is the combination of the x and y mode signals. The wavelength spacing between both modes is defined by 2ΛΔn [87]. Hence, for increasing birefringence values, a broadening of the reflection band is first obtained before both polarization modes become well separated [88–92].…”

Section: Demodulation Techniques For Embedded Fbgs For Shm and Curingmentioning

confidence: 99%

Fiber Bragg Grating Sensors toward Structural Health Monitoring in Composite Materials: Challenges and Solutions

Kinet

Mégret

Goossen

et al. 2014

Sensors

442

237

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Nowadays, smart composite materials embed miniaturized sensors for structural health monitoring (SHM) in order to mitigate the risk of failure due to an overload or to unwanted inhomogeneity resulting from the fabrication process. Optical fiber sensors, and more particularly fiber Bragg grating (FBG) sensors, outperform traditional sensor technologies, as they are lightweight, small in size and offer convenient multiplexing capabilities with remote operation. They have thus been extensively associated to composite materials to study their behavior for further SHM purposes. This paper reviews the main challenges arising from the use of FBGs in composite materials. The focus will be made on issues related to temperature-strain discrimination, demodulation of the amplitude spectrum during and after the curing process as well as connection between the embedded optical fibers and the surroundings. The main strategies developed in each of these three topics will be summarized and compared, demonstrating the large progress that has been made in this field in the past few years.

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Section: Demodulation Techniques For Embedded Fbgs For Shm and Curingmentioning

confidence: 99%

Fiber Bragg Grating Sensors toward Structural Health Monitoring in Composite Materials: Challenges and Solutions

Kinet

Mégret

Goossen

et al. 2014

Sensors

442

237

View full text Add to dashboard Cite

show abstract

“…These modes undergo different couplings through the grating so that two different reflected coefficients are obtained. The x and y modes reflected spectra are identical in shape but slightly shifted in wavelength by a quantity Δλ = 2ΔnΛ [12]. An important consequence of the birefringence is the presence of a significant differential group delay (DGD) between the two eigenmodes.…”

Section: Cfbgs Spectral Characteristics In the Presence Of Local Birementioning

confidence: 99%

“…An important consequence of the birefringence is the presence of a significant differential group delay (DGD) between the two eigenmodes. It is defined as the difference in absolute values between the delays measured along the x and y axes [12]:…”

Section: Cfbgs Spectral Characteristics In the Presence Of Local Birementioning

confidence: 99%

All-fiber tunable optical delay line

et al. 2010

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We present a tunable optical delay line based on the use of a single chirped fiber Bragg grating written into a standard single mode optical fiber. In the proposed scheme, the delay is induced through the Bragg grating differential group delay curve. This is achieved by launching orthogonally polarized optical pulses in both directions into the Bragg grating and by controlling its local birefringence. This bidirectional propagation allows to compensate the second-order dispersion. The setup is suitable to delay pulses with a spectral width just less than the grating reflection bandwidth, which is particularly useful in the context of forthcoming wavelength division multiplexing ultra-high bit rate lightwave systems. In this work, the performances of the setup are investigated using a pulsed laser delivering 6.3 ps Fourier transform limited pulses at 1548 nm. A maximum delay of 120 ps (about 20 times the pulse width) is reported experimentally.

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“…Besides, in the context of optical sensing, the analysis of the evolution with wavelength of differential group delay in uniform gratings has been reported with the purpose to realize customized gratings for sensor applications [7]. In this contribution, an approach for interrogating a LPGbased liquid level sensor is proposed and validated via experiments.…”

Section: Introductionmentioning

confidence: 99%

Continuous Liquid-Level Sensor Based on a Long-Period Grating and Microwave Photonics Filtering Techniques

et al. 2016

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Spectral characterization of differential group delay in uniform fiber Bragg gratings

Cited by 35 publications

References 10 publications

Fiber Bragg Grating Sensors toward Structural Health Monitoring in Composite Materials: Challenges and Solutions

Fiber Bragg Grating Sensors toward Structural Health Monitoring in Composite Materials: Challenges and Solutions

All-fiber tunable optical delay line

Continuous Liquid-Level Sensor Based on a Long-Period Grating and Microwave Photonics Filtering Techniques

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