Fiber Fabry–Perot tip sensor based on multimode photonic crystal fiber

Wu, Di; Huang, Yu; Fu, Jianyu; Wang, Guoyin

doi:10.1016/j.optcom.2014.10.062

Cited by 17 publications

(8 citation statements)

References 16 publications

(37 reference statements)

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“…Comparatively, the schemes of intensity demodulation only need a cost-effective power meter, it is convenient in practical applications. Wu constructed a filling-free FPI structure by simply splicing a section of endless multi-mode photonic crystal fiber (MPCF) [14] or single-mode PCF [15] to a conventional SMF, the sensitivities are 21.52 dB/RIU and 52.4 dB/RIU, respectively. Ran [16] etched a short air cavity near the tip of SMF by laser micromachining, and the sensitivity of 27 dB/RIU is obtained.…”

Section: Introductionmentioning

confidence: 99%

Up-down Taper Based In-Fiber Mach-Zehnder Interferometer for Liquid Refractive Index Sensing

Han

Liu

Jiang

et al. 2019

Sensors

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A novel in-fiber Mach-Zehnder interferometer based on cascaded up-down-taper (UDT) structure is proposed by sandwiching a piece of polarization maintaining fiber between two single-mode fibers (SMF) and by utilizing over-fusion splicing method. The dual up tapers respectively act as fiber splitter/combiner, the down taper acts as an optical attenuator. The structure parameters are analyzed and optimized. A larger interference fringe extinction ratio ~15 dB is obtained to achieve refractive index (RI) sensing based on intensity demodulation. The experimental results show that the RI sensitivity is −310.40 dB/RIU with the linearity is improved to 0.99 in the range of 1.3164–1.3444. The corresponding resolution can reach 3.22 × 10−5 RIU, which is 6.8 times higher than wavelength demodulation. The cross sensitivity which caused by temperature fluctuation is less than 1.4 × 10−4.

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Section: Introductionmentioning

confidence: 99%

Up-down Taper Based In-Fiber Mach-Zehnder Interferometer for Liquid Refractive Index Sensing

Han

Liu

Jiang

et al. 2019

Sensors

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“…Optical fiber refractometers have attracted widespread attention in the past decades due to many desirable advantages such as the small size, compact structure, high flexibility, immunity to electromagnetic interference, corrosion resistance, and the capacity for in situ and multiplexed operation. Various optical fiber refractometers have been developed including tapered fiber structures [1], optical fiber surface plasmon resonance (SPR) devices [2][3], fiber Bragg gratings (FBGs) [4][5], titled fiber Bragg gratings (TFBGs) [6], long-period gratings (LPGs) [7][8], optical fiber modal interferometers (MIs) [9][10], and fiber Fabry-Perot interferometers (FPIs) [11][12][13][14][15][16]. Among them, the fiber FPIs have advantages of compact probe structure, large measurement range, linear response, low temperature cross-sensitivity, and convenient reflection mode for detection, which make them particularly attractive for RI measurement.…”

Section: Introductionmentioning

confidence: 99%

“…Normally, the intrinsic fiber FPI is difficult to be fabricated and has a relatively low fringe contrast. The in-line fiber FPI has a hybrid structure combining the characteristics of extrinsic and intrinsic FPIs [13][14][15][16]. It has been a hotspot in recent years due to its good performance and easy fabrication.…”

Section: Introductionmentioning

confidence: 99%

“…However, it requires a high signal-to-noise ratio (SNR) to calculate the maximum fringe contrast accurately. D. Wu et al [15] used the FFT algorithm to obtain the spatial frequency spectrum of interference fringe and determined the RI by the peak amplitude, but a limitation of FFT is its poor resolution. They also proposed a spectrum differential integration (SDI) method [16] to calculate the RI induced intensity change of the interference spectrum.…”

Section: Introductionmentioning

confidence: 99%

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HCPCF-based in-line fiber Fabry-Perot refractometer and high sensitivity signal processing method

et al. 2017

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An in-line fiber Fabry-Perot interferometer (FPI) based on the hollow-core photonic crystal fiber (HCPCF) for refractive index (RI) measurement is proposed in this paper. The FPI is formed by splicing both ends of a short section of the HCPCF to single mode fibers (SMFs) and cleaving the SMF pigtail to a proper length. The RI response of the sensor is analyzed theoretically and demonstrated experimentally. The results show that the FPI sensor has linear response to external RI and good repeatability. The sensitivity calculated from the maximum fringe contrast is -136 dB/RIU. A new spectrum differential integration (SDI) method for signal processing is also presented in this study. In this method, the RI is obtained from the integrated intensity of the absolute difference between the interference spectrum and its smoothed spectrum. The results show that the sensitivity obtained from the integrated intensity is about -1.34× 10 5 dB/RIU. Compared with the maximum fringe contrast method, the new SDI method can provide the higher sensitivity, better linearity, improved reliability, and accuracy, and it's also convenient for automatic and fast signal processing in real-time monitoring of RI.

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“…And the fiber-optic RI sensors have recently been intensively investigated due to the properties of small size, high measurement resolution, ability to operate sensors remotely through optical fiber, bio-compatibility, immunity to harsh environments, wide temperature range operational and electromagnetic interference compatibility [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. So far, many fiber optic RI sensors were built in the past by utilizing various sensing principles including Mach-Zehnder interferometers (MZIs) [1][2][3][4][5][6][7], Fabry-Perot interferometers (FPIs) [8], Surface Plasmon Resonance (SPR) [9][10] and others. Those sensors had the advantage of high sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Measurement of RI and Temperature Based on a Composite Interferometer

Zhao

Cai

et al. 2016

IEEE Photon. Technol. Lett.

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A novel double-parameters sensor based on a composite interference structure has been designed and implemented in this paper. It can be regarded as a cascade of the conventional single mode fiber (SMF)-multimode fiber (MMF)-Photonic crystal fiber (PCF) -SMF structure, which forms a reflected Fabry-Perot interferometer (FPI) and a transmitted Mach-Zehnder interferometer (MZI) at the same time. In addition, a simultaneous measurement of temperature and refractive index has been achieved by monitoring the correlative moves of reflected spectrum and transmitted spectrum. The fact that these two spectra do not interfere with each other makes it easier to obtain a demodulation method that does not involve complex fast Fourier transform (FFT) and matrix computation. The sensitivities of temperature and refractive index can reach up to 27.5 pm/°C and 108 nm/RIU, respectively.Index Terms-optical fiber sensor, refractive index measurement, temperature measurement, composite interference structure, PCF.

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Fiber Fabry–Perot tip sensor based on multimode photonic crystal fiber

Cited by 17 publications

References 16 publications

Up-down Taper Based In-Fiber Mach-Zehnder Interferometer for Liquid Refractive Index Sensing

Up-down Taper Based In-Fiber Mach-Zehnder Interferometer for Liquid Refractive Index Sensing

HCPCF-based in-line fiber Fabry-Perot refractometer and high sensitivity signal processing method

Simultaneous Measurement of RI and Temperature Based on a Composite Interferometer

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