Ultrasensitive sensing in air based on Sagnac interferometer working at group birefringence turning point

Sun, Li-Peng; Yuan, Zihao; Huang, Tiansheng; Sun, Zhen; Lin, Wenfu; Huang, Yan; Xiao, Peng; Yang, Mingjin; Li, Jie; Guan, Bai‐Ou

doi:10.1364/oe.27.029501

Cited by 34 publications

(18 citation statements)

References 36 publications

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“…The results indicate that the temperature response of the proposed sensor is independent on the polished depth. Finally, due to breaking circular-symmetrical of optical fiber cladding cross-section by side-polishing process, when light passes through the side-polishing fiber MZI structure, two orthogonal polarization cladding modes have different RI responses [27]. The cladding mode whose field distribution parallel to the side-polished direction has a larger evanescent field than that perpendicular to the side-polished direction.…”

Section: Investigation Of a Side-polished Fiber Mzi And Its Sensing Pmentioning

confidence: 99%

“…Due to cross sensitivity, most fiber optic MZI sensors are using to measure a single physical parameter, which cannot satisfy the requirement of simultaneously measurements of multiple parameters. Recently, many fiber-optic processing techniques have been combined with fiber-optic sensor, including tapering [27], etching [28], twisting [29], side-polishing [30] etc. The fiber-optic side polishing technique has been proved to be effectively improving sensing performance [30][31].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of a Side-Polished Fiber MZI and Its Sensing Performance

Zhang

Liu

et al. 2020

IEEE Sensors J.

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Abstract-A novel all-fiber Mach-Zehnder interferometer (MZI), which consists of lateral core fusion splicing of a short section of side-polished single mode fiber (SMF) between two SMFs was proposed and demonstrated. A simple fiber side-polished platform was built to control the side polished depth through a microscope. The sensitivity of the fiber MZI structure to the surrounding refractive index (RI) can be greatly improved with the increase of the side-polished depth, but has no effect on the temperature sensitivity. The sensor with a polished depth of 44.2 μm measured RI sensitivity up to -118.0 nm/RIU (RI unit) in the RI range from 1.333 to 1.387, which agrees well with simulation results by using the beam propagation method (BPM). In addition, the fiber MZI structure also can achieve simultaneous measurement of both RI and temperature. These results show its potential for use in-line fiber type sensing application.Index Terms-Fiber-optic, side-polished, Mach-Zehnder interferometer, refractive index (RI) Ping Zhang received the B.S. degree from Hefei Normal University in 2018. He is currently pursuing the M.S. degree in optical engineering with Nanchang Hangkong University. His current research interests include optical fiber sensing theory and technology.

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Section: Investigation Of a Side-polished Fiber Mzi And Its Sensing Pmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of a Side-Polished Fiber MZI and Its Sensing Performance

Zhang

Liu

et al. 2020

IEEE Sensors J.

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“…Most RI sensors are designed for an aquatic environment, that the RI measurement region is approximately 1.33. Gas detection has an external RI of ~1.0, which should overcome the larger mismatch between the allowable guided mode and the external gaseous medium [11]. There are a few reports regarding gas RI sensing, which use the wavelength demodulation method to achieve the highest wavelength sensitivity.…”

Section: Iintroductionmentioning

confidence: 99%

“…By using a nanofiber couple, the sensitivity was enhanced even more up to 92,020 nm/RIU [14]. By employing a microfiberbased Sagnac interferometer at the group birefringence turning point, the highest RI sensitivity reached 160,938.9 nm/RIU [11]. However, temperature cross-sensitivity is a key issue because the higher the sensitivity, the more susceptible the sensor was to the external environment, resulting in poor measurement accuracy.…”

Section: Iintroductionmentioning

confidence: 99%

Intensity Modulated Gas RI Sensor Based on Inornate Antiresonant Hollow-Core Fiber With Ultrahigh Sensitivity

Hou

Wang

et al. 2021

IEEE Access

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A gas refractive index (RI) sensor based on an inornate antiresonant hollow-core fiber (HCF) was theoretically analyzed and experimentally demonstrated. The transmission spectra evolution of the proposed sensor and the resonance intensity variations to the surrounding gas RI were simulated. Theoretical analysis found that the intensity sensitivity of inornate HCF is higher than that of coated HCF. In the experiment, a sensor with a 5 mm-long HCF provided exceptional sensitivity-as high as 2236.1 dB/RIU. The sensitivity was enhanced by improving the resonance intensity of the inornate HCF, which could be further improved by increasing the HCF length. In addition, temperature sensing was performed to resolve the temperature cross-sensitivity issue using a wavelength interrogation method. The proposed RI sensor exhibited the advantages of easily manufactured and with ultrahigh sensitivity.

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“…According to whether occur light interferes or not, optical fiber sensors can be divided into interferometric optical fiber sensors and non-interferometric optical fiber sensors, of which interferometric optical fiber sensors normally have higher accuracy [13][14][15]. Interferometric optical fiber sensors can be divided into several types according to their internal structures, including Michlson sensor [16], Mach-Zehnder sensor [17], Sagnac sensor [18], Fabry-Perot sensor and so on. Due to a series of advantages, such as simple structure, miniature size, high reliability,…”

Section: Introductionmentioning

confidence: 99%

An In-Situ Electroplating Fabricated Fabry-Perot Interferometric Sensor and Its Temperature Sensing Characteristics

Liu

et al. 2020

Coatings

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In this study, in-situ electroplating method was used to fabricate a metal joint fixed extrinsic Fabry-Perot interferometric (EFPI) sensor. Specifically, optical fibers were firstly chemical plated with a very thin conductive nickel layer and then electroplated with nickel coating. After that, in-situ electroplating method was used to fix the metallized optical fibers and the capillary steel tube, the reflection spectra changes of the EFPI sensors during the in-situ electroplating process were recorded in real time, and the temperature sensing characteristics of the EFPI sensors were studied assisted by the temperature sensing system. Results show that: (i) optical fibers are well protected by the nickel layer; (ii) the reflection spectra of the EFPI sensors are clear and complete in the whole in-situ electroplating process, it is feasible to fabricate a EFPI sensor with the in-situ electroplating method; (iii) with the increases of temperature, the peak numbers of the reflection spectra of the EFPI sensors increase gradually; (iv) the EFPI sensors with different cavity length based on the in-situ electroplating method show excellent sensing characteristics, the temperature sensitivities reach up to about 700, 600, and 400 pm/°C from room temperature to 400 °C, respectively.

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Ultrasensitive sensing in air based on Sagnac interferometer working at group birefringence turning point

Cited by 34 publications

References 36 publications

Investigation of a Side-Polished Fiber MZI and Its Sensing Performance

Investigation of a Side-Polished Fiber MZI and Its Sensing Performance

Intensity Modulated Gas RI Sensor Based on Inornate Antiresonant Hollow-Core Fiber With Ultrahigh Sensitivity

An In-Situ Electroplating Fabricated Fabry-Perot Interferometric Sensor and Its Temperature Sensing Characteristics

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