High-Resolution AWG-Based Fiber Bragg Grating Interrogator

Pustakhod, Dzmitry; Kleijn, E Emil; Williams, KA Kevin; Leijtens, X.J.M.

doi:10.1109/lpt.2016.2587812

Cited by 19 publications

(4 citation statements)

References 12 publications

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“…The temperature resolution of an FBG sensor is typically determined by the resolution of the interrogator and the sensitivity of a sensor to temperature changes. The current state-of-the art interrogators provide around 1 pm spectral resolution [36] corresponding to a 0.1 °C change in bare fibers. The temperature sensitivity of an FBG sensor can be improved through packaging [37,38,39].…”

Section: Introductionmentioning

confidence: 99%

Possibilities for Groundwater Flow Sensing with Fiber Bragg Grating Sensors

Drusová

Bakx

Wexler³

et al. 2019

Sensors

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An understanding of groundwater flow near drinking water extraction wells is crucial when it comes to avoiding well clogging and pollution. A promising new approach to groundwater flow monitoring is the deployment of a network of optical fibers with fiber Bragg grating (FBG) sensors. In preparation for a field experiment, a laboratory scale aquifer was constructed to investigate the feasibility of FBG sensors for this application. Multiparameter FBG sensors were able to detect changes in temperature, pressure, and fiber shape with sensitivities influenced by the packaging. The first results showed that, in a simulated environment with a flow velocity of 2.9 m/d, FBG strain effects were more pronounced than initially expected. FBG sensors of a pressure-induced strain implemented in a spatial array could form a multiplexed sensor for the groundwater flow direction and magnitude. Within the scope of this research, key technical specifications of FBG interrogators for groundwater flow sensing were also identified.

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Section: Introductionmentioning

confidence: 99%

Possibilities for Groundwater Flow Sensing with Fiber Bragg Grating Sensors

Drusová

Bakx

Wexler³

et al. 2019

Sensors

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“…According to the employed architectures, the structures of on-chip FBG interrogators can be mainly categorized into four types, including the Mach-Zehnder interferometer (MZI) [19][20][21][22], micro-ring resonator (MRR) [23][24][25][26], arrayed waveguide grating (AWG) [27][28][29][30][31][32][33][34][35], and tunable semiconductor laser [36]. Among them, the wavelength accuracy, wavelength range, size of interrogator, and number of FBG sensors are difficult to be satisfied simultaneously.…”

Section: Introductionmentioning

confidence: 99%

On-Chip Sub-Picometer Continuous Wavelength Fiber-Bragg-Grating Interrogator

Zhuang,

Zou,

Zhang

et al. 2024

Photonic Sens

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Miniaturized fiber-Bragg-grating (FBG) interrogators are of interest for applications in the areas where weight and size controlling is important, e.g., airplanes and aerospace or in-situ monitoring. An ultra-compact high-precision on-chip interrogator is proposed based on a tailored arrayed waveguide grating (AWG) on a silicon-on-insulator (SOI) platform. The on-chip interrogator enables continuous wavelength interrogation from 1 544 nm to 1 568 nm with the wavelength accuracy of less than 1 pm [the root-mean-square error (RMSE) is 0.73 pm] over the whole wavelength range. The chip loss is less than 5 dB. The 1 × 16 AWG is optimized to achieve a large bandwidth and a low noise level at each channel, and the FBG reflection peaks can be detected by multiple output channels of the AWG. The fabricated AWG is utilized to interrogate FBG sensors through the center of gravity (CoG) algorithm. The validation of an on-chip FBG interrogator that works with sub-picometer wavelength accuracy in a broad wavelength range shows large potential for applications in miniaturized fiber optic sensing systems.

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“…Considering the correlation between the dynamic range and the relative spectral width of the FBG and AWG channels, a scheme for measuring the power of multiple channels is proposed to improve the dynamic range and remove the constraint of channel spacing 22,23 , but the peak of the FBG must overlap with several AWG channels. Dzmitry 24 innovatively proposed an InP-based AWG structure combined with multimode interference (MMI), which increases the output spectrum by adding input channels, indicating that increasing the overlap of output spectra can improve the performance of demodulation systems. Based on this structure, Yuan reported an AWG-FBG demodulation system that uses two AWGs, and the dynamic range was 28 nm with a 1.3 nm bandwidth at 3 dB 25 .…”

Section: Introductionmentioning

confidence: 99%

High-Precision Continuous FBG Interrogator based on an AWG

Yao,

Jiao

et al. 2024

Preprint

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Although arrayed waveguide gratings (AWGs) are widely used in fibre Bragg grating (FBG) demodulation systems, their applications in real environments have been limited due to their narrow dynamic range and inability to continuously demodulate FBGs because of the finite bandwidth of AWG channels. Here, we developed a wide-dynamic-range, high-precision, continuous-demodulation FBG interrogator utilizing a dual-input channel on-chip silicon AWG. The introduction of two input channels in the AWG allowed two spectral peaks in each channel; therefore, staggered spectral peaks were realized. A joint-peak demodulation method based on this spectrum is proposed to improve the dynamic range and demodulation precision. With the proposed structure and method, we achieved continuous interrogation with a demodulation precision of 25.58 pm and a dynamic range of 24.5 nm in the 1537.5-1565.3 nm wavelength region. The relative demodulation accuracy within the full range reaches 0.1%. The dynamic range of adjacent channels is 5.4 nm, which is approximately 4 times greater than the dynamic range of an FBG conventional demodulation system using an AWG, and the relative demodulation accuracy is 0.47%. To our knowledge, the relative demodulation accuracy is currently the highest reported. This developed interrogator, with a core size of 420 µm × 300 µm, theoretically explained and experimentally verified the possibility of the accurate measurement of an arbitrary FBG wavelength with high demodulation accuracy in the measurement range. This work achieved continuous monitoring of external temperature by FBGs and demonstrated their significant potential in expanding the application field of FBGs.

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High-Resolution AWG-Based Fiber Bragg Grating Interrogator

Cited by 19 publications

References 12 publications

Possibilities for Groundwater Flow Sensing with Fiber Bragg Grating Sensors

Possibilities for Groundwater Flow Sensing with Fiber Bragg Grating Sensors

On-Chip Sub-Picometer Continuous Wavelength Fiber-Bragg-Grating Interrogator

High-Precision Continuous FBG Interrogator based on an AWG

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