Improvement on vibration measurement performance of laser self-mixing interference by using a pre-feedback mirror

Zhu, Wei; Chen, Qianghua; Wang, Yanghong; Luo, Huifu; Wu, Huan; Ma, Binwu

doi:10.1016/j.optlaseng.2018.01.022

Cited by 30 publications

(6 citation statements)

References 12 publications

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“…However, traditional optical interference measurement systems suffer from issues such as complex structures, large size, and high costs. This has prompted the development of Self-Mixing Interferometry (SMI), an emerging sensing technology, that has been extensively researched in the last decades for applications such as distance 1,6 , velocity 2,7,8 , displacement 3,9,10 and vibration measurement 4 .…”

Section: Introductionmentioning

confidence: 99%

Improving the measurement performance for a self-mixing interferometry-based distance and velocity sensing system using VMD

An,

Chen

et al. 2023

Advanced Sensor Systems and Applications XIII

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Self-mixing interferometry (SMI) is a new sensing technology. However, the Self-Mixing Signal (SMS) used for measurement is usually subject to noise or interference, resulting in poor measurement accuracy. To get around this problem, in this paper, we propose a novel method which can remove the frequency distortion and noises simultaneously using variational mode decomposition (VMD). Proper choices of the VMD parameters are made based on the characteristics of the SMSs and an effective algorithm is designed for retrieving the distance and velocity of the target simultaneously. The proposed method has been verified by both simulation and experimental data showing the measured distance and velocity are more accurate than those using filtering methods.

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Section: Introductionmentioning

confidence: 99%

Improving the measurement performance for a self-mixing interferometry-based distance and velocity sensing system using VMD

An,

Chen

et al. 2023

Advanced Sensor Systems and Applications XIII

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“…However, it lacks an analytical expression for the linewidth, and it does not explore the effect of the added term on other optical feedback regimes, which limits the scope of the analysis [7]. Dual external cavities have also been explored to maximize the sensitivity of self-mixing interferometers for sensing applications [29][30][31]. These studies focus on improving the interferometric signal in terms of output power characteristics, yet they do not study the effect EOF has on linewidth, which is crucial for other applications such as coherent communications [32] or frequency metrology [33].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Semiconductor Lasers under External Optical Feedback from Both Sides of the Laser Cavity

Brusatori

Volet

2022

Photonics

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To increase the spectral efficiency of coherent communication systems, lasers with ever-narrower linewidths are required as they enable higher-order modulation formats with lower bit-error rates. In particular, semiconductor lasers are a key component due to their compactness, low power consumption, and potential for mass production. In field-testing scenarios their output is coupled to a fiber, making them susceptible to external optical feedback (EOF). This has a detrimental effect on its stability, thus it is traditionally countered by employing, for example, optical isolators and angled output waveguides. In this work, EOF is explored in a novel way with the aim to reduce and stabilize the laser linewidth. EOF has been traditionally studied in the case where it is applied to only one side of the laser cavity. In contrast, this work gives a generalization to the case of feedback on both sides. It is implemented using photonic components available via generic foundry platforms, thus creating a path towards devices with high technology-readiness level. Numerical results shows an improvement in performance of the double-feedback case with respect to the single-feedback case. In particularly, by appropriately selecting the phase of the feedback from both sides, a broad stability regime is discovered. This work paves the way towards low-cost, integrated and stable narrow-linewidth integrated lasers.

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“…The laser self-mixing interference (SMI) technique [1][2][3] is an important and advanced method for ultra-precision measurements. Many interesting and important fields are inseparable from it, such as human ECG signal detection [4]; spectrum measurement [5,6]; and the measurement of phase, displacement, and vibration [1,[7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Combined Feature Extraction and Random Forest for Laser Self-Mixing Vibration Measurement without Determining Feedback Intensity

Liang

Chen

Jiang

et al. 2022

Sensors

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To measure the vibration of a target by laser self-mixing interference (SMI), we propose a method that combines feature extraction and random forest (RF) without determining the feedback strength (C). First, the temporal, spectral, and statistical features of the SMI signal are extracted to characterize the original SMI signal. Secondly, these interpretable features are fed into the pretrained RF model to directly predict the amplitude and frequency (A and f) of the vibrating target, recovering the periodic vibration of the target. The results show that the combination of RF and feature extraction yields a fit of more than 0.94 for simple and quick measurement of A and f of unsmooth planar vibrations, regardless of the feedback intensity and the misalignment of the retromirror. Without a complex optical stage, this method can quickly recover arbitrary periodic vibrations from SMI signals without C, which provides a novel method for quickly implementing vibration measurements.

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Improvement on vibration measurement performance of laser self-mixing interference by using a pre-feedback mirror

Cited by 30 publications

References 12 publications

Improving the measurement performance for a self-mixing interferometry-based distance and velocity sensing system using VMD

Improving the measurement performance for a self-mixing interferometry-based distance and velocity sensing system using VMD

Dynamics of Semiconductor Lasers under External Optical Feedback from Both Sides of the Laser Cavity

Combined Feature Extraction and Random Forest for Laser Self-Mixing Vibration Measurement without Determining Feedback Intensity

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