Nonlinearity Correction in OFDR System Using a Zero-Crossing Detection-Based Clock and Self-Reference

Zhao, Shiyuan; Tan, Jiubin

doi:10.3390/s19173660

Cited by 23 publications

(3 citation statements)

References 12 publications

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“…In "Nonlinearity Correction in OFDR System Using a Zero-Crossing Detection-Based Clock and Self-Reference" [9], a method for tuning nonlinearity correction in an optical frequency-domain reflectometry (OFDR) system was developed from the aspect of data acquisition and post-processing. The spatial resolution test and the distributed strain measurement test were both performed based on this nonlinearity correction method, which reduced the hardware and data burden for the system and has potential value for system integration and miniaturization.…”

Section: Summary Of Special Issue Papersmentioning

confidence: 99%

Special Issue “Fiber Optic Sensors and Applications”: An Overview

Wei

Tjin

2020

Sensors

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Section: Summary Of Special Issue Papersmentioning

confidence: 99%

Special Issue “Fiber Optic Sensors and Applications”: An Overview

Wei

Tjin

2020

Sensors

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“…After years of research, the distributed fiber optical sensing technology based on OFDR has formed a basic system scheme and signal demodulation algorithm. However, the light source of OFDR is usually a external cavity tunable lasers (ECTLs), such as Agilent 81600 [6], Newfocus TLB6600 [7], Santec TLS-5500 [8], LUNA Phoenix 1200/1400 [9,10], Keysight 81606A [11], etc. ECTLs are susceptible to interference as well as large in size and weight because of the mechanical scanning structure [12].…”

Section: Introductionmentioning

confidence: 99%

Influence of spectral splicing on the spatial resolution of optical frequency domain reflectometry

Xue,

Wang,

Tang

et al. 2023

AOPC 2023: Optic Fiber Gyro

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The optical frequency domain reflectometry (OFDR) demodulation technology based on DBR laser and spectral splicing was proposed in our previously studied. Spectral splicing solves the problem of laser mode hopping that is not allowed in the original OFDR demodulation technology. However the detailed analysis of the influence of spectral splicing on the spatial resolution of OFDR didn't been provided. Based on previous research, the influence of spectral splicing on the spatial resolution of OFDR was analyzed in detail. The effects of single-segment wavelength range, number of spectral splicing segments, and splicing error on spatial resolution of OFDR were simulated. The results indicate that the spatial resolution of OFDR after spectral splicing is determined by the single-segment wavelength range, and it has the same spatial resolution as demodulating only one section of the spectrum. Meanwhile, the spatial resolution is independent of the number of spectral splicing segments and splicing errors (within 10 pm). Therefore, in order to improve the spatial resolution of OFDR, the single-segment wavelength range should be expanded as much as possible. Finally, experimental testing was conducted to verify the effectiveness. 35 spectral segments were achieved using a DBR laser, with each segment having a wavelength range of 1.2nm. By identifying the peak width of the fiber optic connector, it was verified that the spatial resolution of multi-segment spectral splicing and single-segment spectral is the same. However, experiments have also shown that spectral splicing weakens the measurement noise of the system, which is one of its advantages.

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“…An auxiliary interferometer (AI) is an effective way to estimate and eliminate the tuning nonlinearity [ 18 ]. A customised circuit is proposed to generate an external clock with higher beating frequency based on a zero-crossing detection [ 19 ]. Hilbert transformation-based correction provides another straightforward solution to suppressing the nonlinear tuning by obtaining the instantaneous sweep frequency [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Ultimate Spatial Resolution Realisation in Optical Frequency Domain Reflectometry with Equal Frequency Resampling

Guo

Han

Yan

et al. 2021

Sensors

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A method based on equal frequency resampling is proposed to suppress laser nonlinear frequency sweeping for the ultimate spatial resolution in optical frequency domain reflectometry. Estimation inaccuracy of the sweeping frequency distribution caused by the finite sampling rate in the auxiliary interferometer can be efficiently compensated by the equal frequency resampling method. With the sweeping range of 130 nm, a 12.1 µm spatial resolution is experimentally obtained. In addition, the sampling limitation of the auxiliary interferometer-based correction is discussed. With a 200 m optical path delay in the auxiliary interferometer, a 21.3 µm spatial resolution is realised at the 191 m fibre end. By employing the proposed resampling and a drawing tower FBG array to enhance the Rayleigh backscattering, a distributed temperature sensing over a 105 m fibre with a sensing resolution of 1 cm is achieved. The measured temperature uncertainty is limited to ±0.15 °C.

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Nonlinearity Correction in OFDR System Using a Zero-Crossing Detection-Based Clock and Self-Reference

Cited by 23 publications

References 12 publications

Special Issue “Fiber Optic Sensors and Applications”: An Overview

Special Issue “Fiber Optic Sensors and Applications”: An Overview

Influence of spectral splicing on the spatial resolution of optical frequency domain reflectometry

Ultimate Spatial Resolution Realisation in Optical Frequency Domain Reflectometry with Equal Frequency Resampling

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