Linearized Wavelength Interrogation System of Fiber Bragg Grating Strain Sensor Based on Wavelength-Swept Active Mode Locking Fiber Laser

Lee, Hwi Don; Kim, Gyeong Hun; Eom, Tae Joong; Jeong, Myung Yung; Kim, Chang-Seok

doi:10.1109/jlt.2014.2368148

Cited by 39 publications

(20 citation statements)

References 32 publications

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“…The performance of a strain sensor is generally characterised by its stretchability, gauge factor (sensitivity), hysteresis, and response time [362,363]. There are several types of strain sensors which include resistive [59,60,90,94,100,101,116,315,329,, capacitive [101,322,323,395,396], piezoelectric [397][398][399][400], fibre Bragg grating [401][402][403], and triboelectric [404].…”

Section: Strain Sensorsmentioning

confidence: 99%

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Flexible Sensors—From Materials to Applications

et al. 2019

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Flexible sensors have the potential to be seamlessly applied to soft and irregularly shaped surfaces such as the human skin or textile fabrics. This benefits conformability dependant applications including smart tattoos, artificial skins and soft robotics. Consequently, materials and structures for innovative flexible sensors, as well as their integration into systems, continue to be in the spotlight of research. This review outlines the current state of flexible sensor technologies and the impact of material developments on this field. Special attention is given to strain, temperature, chemical, light and electropotential sensors, as well as their respective applications.

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Section: Strain Sensorsmentioning

confidence: 99%

“…Fiber optics were used to manufacture strain sensors [401][402][403]412]. Optical fibres that were able to withstand an axial strain of 700% were fabricated [412].…”

Section: Piezoelectric and Other Strain Sensorsmentioning

confidence: 99%

Flexible Sensors—From Materials to Applications

et al. 2019

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“…Recently, a few advanced designs of wavelength-swept lasers, such as Fourier-domain mode-locking lasers [5] and micro-electro-mechanical system (MEMS) tunable vertical-cavity surface-emitting lasers (VCSELs) [6], have shown high performances with fast sweep rates of over a few hundred kHz, wide bandwidths of over 100 nm, and narrow linewidths of under 0.1 nm, which are commonly required for optical coherence tomography (OCT) [7]. However, owing to the mechanical movement of their conventional wavelength tunable filters, such lasers inherently suffer from thermal and mechanical instabilities and nonlinear tuning problems [7][8][9][10]. Nowadays, wavelength-swept active mode locking (AML) lasers have been developed by exploiting a radio frequency (RF) signal generator to modulate the gain of a semiconductor optical amplifier (SOA) using an electric current pump directly, which can implement an output wavelength tuning from the AML condition matching in a chromatic dispersion cavity [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…However, owing to the mechanical movement of their conventional wavelength tunable filters, such lasers inherently suffer from thermal and mechanical instabilities and nonlinear tuning problems [7][8][9][10]. Nowadays, wavelength-swept active mode locking (AML) lasers have been developed by exploiting a radio frequency (RF) signal generator to modulate the gain of a semiconductor optical amplifier (SOA) using an electric current pump directly, which can implement an output wavelength tuning from the AML condition matching in a chromatic dispersion cavity [8][9][10]. Wavelength-swept AML lasers have not only demonstrated sweep rates of over 100 kHz [8][9][10] and bandwidths of 100 nm [11] but have also shown a few particular advantages, such as higher duty ratios (> 90%), linear sweeping (>0.9999), and phase stability, due to their unique akinetic wavelength sweeping mechanism that eliminates conventional mechanical and sinusoidal movement [10,12].…”

Section: Introductionmentioning

confidence: 99%

Narrowing Linewidth of Wavelength-Swept Active Mode Locking Laser Based on Cross Gain Modulation

et al. 2019

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We demonstrate a novel narrow-linewidth configuration of a wavelength-swept active mode locking (AML) fiber laser. The frequency response of the modulation depth of a semiconductor optical amplifier can be improved in a higher modulation frequency region by adapting the cross gain modulation (XGM) configuration, compared to that of the conventional direct gain modulation (DGM) configuration. As a sufficient modulation depth is implemented for an AML at higher modulation frequencies at around gigahertz order, it results in a narrower linewidth of lasing output. For the same modulation frequency of 1361.25 MHz, the linewidth of 0.25 nm with DGM becomes narrower up to 0.113 nm with XGM, which corresponds to an improved point spread function with 1.41 mm of 6-dB roll-off.

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“…Its feasibility for use with fiber Bragg grating sensor systems 25 and SS-OCT systems 11,23,26–33 with AML wavelength-swept sources has been reported. The SS-OCT images showed various samples, such as cover glasses, adhesive tape, and an in-vivo human finger, at a sweep rate of 1 kHz.…”

Section: Introductionmentioning

confidence: 99%

Akinetic swept-source optical coherence tomography based on a pulse-modulated active mode locking fiber laser for human retinal imaging

Lee

Kim

Shin

et al. 2018

Sci Rep

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Optical coherence tomography (OCT) is a noninvasive imaging modality that can provide high-resolution, cross-sectional images of tissues. Especially in retinal imaging, OCT has become one of the most valuable imaging tools for diagnosing eye diseases. Considering the scattering and absorption properties of the eye, the 1000-nm OCT system is preferred for retinal imaging. In this study, we describe the use of an akinetic swept-source OCT system based on a pulse-modulated active mode locking (AML) fiber laser at a 1080-nm wavelength for in-vivo human retinal imaging. The akinetic AML wavelength-swept fiber laser was constructed with polarization-maintaining fiber that has an average linewidth of 0.625 nm, a spectral bandwidth of 81.15 nm, and duty ratio of 90% without the buffering method. We successfully obtained in-vivo human retinal images using the proposed OCT system without the additional k-clock and the frequency shifter that provides a wide field of view of 43.1°. The main retina layers, such as the retinal pigment epithelium, can be distinguished from the OCT image with an axial resolution of 6.3 μm with this OCT system.

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Linearized Wavelength Interrogation System of Fiber Bragg Grating Strain Sensor Based on Wavelength-Swept Active Mode Locking Fiber Laser

Cited by 39 publications

References 32 publications

Flexible Sensors—From Materials to Applications

Flexible Sensors—From Materials to Applications

Narrowing Linewidth of Wavelength-Swept Active Mode Locking Laser Based on Cross Gain Modulation

Akinetic swept-source optical coherence tomography based on a pulse-modulated active mode locking fiber laser for human retinal imaging

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