Common difference temperature compensation based fiber refractive index sensor through asymmetrical core-offset splicing

Liu, Jiping; Zhang, Xudong; Yang, Jiuru; Kang, Jing; Wang, Xiaofei

doi:10.1016/j.optcom.2018.06.070

Cited by 20 publications

(4 citation statements)

References 25 publications

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“…All-fiber refractive index (RI) sensors offer many advantages, such as insusceptibility to electromagnetic interference, light weight, small size, corrosion resistance, and high sensitivity; thus, they are widely used in biochemical sensing [1][2][3]. Recently, several types of fiber optic sensors based on fiber Bragg gratings [4,5], long period gratings (LPFG) [6,7], Fabry-Perot interferometers [8,9], fiber optic Sagnac interferometers [10,11], Michelson interferometers [12,13], and Mach-Zehnder interferometers (MZI) capable of RI detection have been proposed [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Temperature-insensitive high sensitivity refractive index sensor based on tapered no core fiber

Lu¹,

Liu²,

Ren³

et al. 2023

Meas. Sci. Technol.

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This study fabricated an ultra-high refractive index sensor based on tapered no-core fiber involving a simple inexpensive process. A splice section of no-core fiber in the middle of single mode fiber was tapered to small diameters. The sensor was sensitive to the surrounding refractive index with a large measurement range of 1.3330–1.4437. The refractive index sensitivity differed with varying wavelengths, with a value of 41916 nm/RIU at approximately 1550 nm. It yielded a low temperature sensitivity of 8.1 pm/°C that can be ignored compared with the refractive index sensitivity. The proposed fiber optic refractive index sensor can be used in many fields such as medicine and biochemical applications.

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Section: Introductionmentioning

confidence: 99%

Temperature-insensitive high sensitivity refractive index sensor based on tapered no core fiber

Lu¹,

Liu²,

Ren³

et al. 2023

Meas. Sci. Technol.

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“…So far, the dual-parameter measurements with high discrimination proficiency have been widely studied and typically the crosstalk from ambient temperature can be effectively eliminated by embedding a fiber Bragg grating, but with a sensitivity of~10 pm/℃ [22][23][24][25]. In order to overcome this limitation, a thin-core fiber (TCF) based MI with suitable core offset is presented and differential temperature compensation is adopted due to ultra-high consistence of temperature response [26]. Furthermore, Yu reported a Fourier analysis method base on intensitymodulation to reduce the measuring error from temperature cross-sensitivity [27].…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, the Mach-Zehnder interference will be formed due to the effective RI difference between the core and cladding modes. From [26], in MMI, the phase difference of high-order modes can be expressed by…”

Section: Introductionmentioning

confidence: 99%

Composite Modal Interferometer for Simultaneous Triple-Parameter Measurement Based on Cascaded No-Cladding Fiber and Thin-Core Fiber Structure

et al. 2020

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In this paper, an in-fiber composite modal interferometer (CMI) is proposed and experimentally demonstrated based on cascaded no-cladding fiber (NCF) and thin-core fiber (TCF) structure, which respectively corresponds to multimode interferometer (MMI) and Mach-Zehnder interferometer (MZI). The self-image effect of MMI is deeply analyzed and the interference fringes distribution of CMI is accurately designed by the selective the length of NCF and TCF. The comprehensive tests are then conducted and the experimental results show that interference fringes present similar temperature response but the apparent differences in strain and refractive index (RI) tests owing to the asymmetrical structure. MMI has a near-zero intensity sensitivity of strain and red-shifts with the increased RI. But MZI has the sensitivity of-19.3nm/RIU and a 4.94 dB increment in the range of 300-1100 με. Thus high-discrimination simultaneous triple-parameter measurement is achieved by means of joint wavelength and intensity demodulation. The proposed CMI has the merits of high sensitivity, low cost and ease of fabrication, and is very promising and potential for the engineering monitoring and sensing applications.

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“…Optical fiber refractive index (RI) sensors are used in biological fields, medicine and environment [1][2][3]. So far, lots of fiber optic RI sensors have been reported in the literature, such as Mach-Zehnder (MZIs) [4][5][6], Fiber Grating [7], Fabry-Pérot (FPIs) [8], Sagnac [9] and multi-mode interferometer [10][11][12]. Among them, Quan [8] prepared an open-cavity FPI by splicing a section of the fused silica fiber tube between photonic crystal fiber (PCF) and single mode fiber (SMF), an ultra-high sensitivity of 30,899 nm/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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Common difference temperature compensation based fiber refractive index sensor through asymmetrical core-offset splicing

Cited by 20 publications

References 25 publications

Temperature-insensitive high sensitivity refractive index sensor based on tapered no core fiber

Temperature-insensitive high sensitivity refractive index sensor based on tapered no core fiber

Composite Modal Interferometer for Simultaneous Triple-Parameter Measurement Based on Cascaded No-Cladding Fiber and Thin-Core Fiber Structure

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

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