Ultrahigh Sensitivity Refractive Index Sensor Based on Optical Microfiber

Ji, Wen; Liu, Huan Huan; Tjin, Swee Chuan; Chow, K. K.; Lim, Anthony

doi:10.1109/lpt.2012.2217738

Cited by 137 publications

(70 citation statements)

References 14 publications

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“…As an alternative to the existing microfiber refractometers, a refractometer using the reflection spectra of a non-adiabatically tapered single-mode fiber has been proposed. A maximum sensitivity of 18681.82 nm/RIU has been achieved [7]. Recently the authors of [8] have presented a broadband biconical 2 × 2 optical microfiber coupler (MFC) made from conventional telecom single-mode fibers that effectively suppresses any higher-order modes present at the input fiber and provides efficient power splitting between the two output ports.…”

mentioning

confidence: 99%

High Sensitivity Fiber Refractometer Based on an Optical Microfiber Coupler

Lin¹,

Wang²,

Semenova³

et al. 2013

IEEE Photon. Technol. Lett.

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confidence: 99%

High Sensitivity Fiber Refractometer Based on an Optical Microfiber Coupler

Lin¹,

Wang²,

Semenova³

et al. 2013

IEEE Photon. Technol. Lett.

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“…As the two modes propagate in media with different effective refractive indices, phase shift occurs when they recombine at the output end of the conical region of the microfiber. Back-and-forth coupling occurs between the multiple modes of the microfiber's waist region and results in a comb spectrum [12] which performs as a modal interferometer with transmission spectra given by (1) [13] …”

Section: Sensor Fabrication and Operating Principlementioning

confidence: 99%

Dual Output Approach in Dye Concentrations Determination Using Non-Adiabatic Tapered Fiber

et al. 2015

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A non-adiabatic tapered optical fiber sensor based on interferometric approach was developed by tapering a singlemode fiber using flame brushing technique. Two output variables in the form of absorption and spectral shift were used to infer the dye concentration of an analyte containing Remazol Black B. The system could measure the dye concentration of the analyte within a range of 50 to 250 ppm with sufficient sensitivity and configurability. A sensitivity of 7.61 × 10 −5 abs/ppm and 0.0045 nm/ppm was obtained for the output derived from the absorption of light and spectral shift, respectively. A new predictive model was formulated by combining the predicted dye concentrations of absorption and spectral shift with equal weightings. Then, an experiment was performed to measure the accuracy of the models that use absorption, spectral shift, and their combination to predict the concentration of an analyte in the range of 50 to 250 ppm. The differences between the actual and the predicted dye concentration values were evaluated in terms of the correlation coefficient (R 2 ), root-mean-square error (RMSE), and mean absolute percentage error (MAPE), respectively. The results show that by combining the two parameters, a better estimate (R 2 = 0.9875, RMSE = 7.6761, MAPE = 4.1257) of the dye concentration with higher correlation and lower error can be achieved. Finally, an additional experiment is conducted to validate the accuracy of the sensors.

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“…RI sensors are widely used in the biological, food and chemical industry. Many types of fiber-optic RI sensors have been demonstrated via optical fiber coil resonators [13], [14], fiber gratings (including short or long period grating) [15]- [23], single mode-multimode-single mode structures [24], microfiber interferometers [25], [26], Mach-Zehnder interferometers (MZIs) [27]- [31], Michelson interferometers (MIs) [32], and microcavity Fabry-Perot interferometers (MCFPIs) [33]. The fiber Bragg gratings (FBGs) are suitable for many physical parameters sensing.…”

Section: Introductionmentioning

confidence: 99%

Bent Fiber Interferometer

Zhang

Peng

2015

J. Lightwave Technol.

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We report a novel fiber-optic interferometer based on Mach-Zehnder interferometer (MZI) from a bent single-mode fiber (SMF) and experimentally demonstrated that it can be used as a fiber-optic refractometer. The interferometer has a simple structure including a standard SMF with a bare fiber semicircular bending region of a given diameter. A fiber MZI is formed by the different optical paths taken by the core and cladding modes from the designed bending fiber structure. We also realize a dualchannel interferometer by using a 9 and 11 mm bending diameter fiber structure and measure the refractive index of the ambient environment by monitoring the wavelength shift of the resonance dips in its transmission spectrum. Additionally, we investigate the relationship between the wavelength shifts of the resonant dips with temperature changes. This dual-channel interferometer can be potentially used for simultaneous measurement of dual chemical parameters.Index Terms-Bent fiber, dual-channel, fiber optic sensor, Mach-Zehnder interferometer.

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Ultrahigh Sensitivity Refractive Index Sensor Based on Optical Microfiber

Cited by 137 publications

References 14 publications

High Sensitivity Fiber Refractometer Based on an Optical Microfiber Coupler

High Sensitivity Fiber Refractometer Based on an Optical Microfiber Coupler

Dual Output Approach in Dye Concentrations Determination Using Non-Adiabatic Tapered Fiber

Bent Fiber Interferometer

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