Refractive index measurement using OTDR-based ring-down technique with S fiber taper

Li, Xiuyan; Wang, Xiao; Niu, Panpan; Zhao, Jiong‐Peng; Zhang, Cheng; Gu, Erdan

doi:10.1016/j.optcom.2019.04.076

Cited by 13 publications

(6 citation statements)

References 21 publications

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“…In recent years, researchers have further improved the sensitivity and detection capabilities of FLRD technology by optimizing the structure, fabrication processes, and optical parameters of tapered optical fibers. For instance, Li et al [83] utilized a bent tapered optical fiber to enhance the decay effect of the signal, achieving high-precision RI measurement through the cascading of an S-shaped optical fiber taper and a Faraday rotation mirror. Yang et al [31] utilized a bent-annealed taper no-core fiber (NCF) immersed in magnetic fluid (MF) as the sensing head to construct a novel FLRD-based current sensing system, as shown in Figure 13.…”

Section: Fiber Interferometermentioning

confidence: 99%

The Structure and Applications of Fused Tapered Fiber Optic Sensing: A Review

Ban,

Lian

2024

Photonics

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Tapered optical fibers have continuously evolved in areas such as distributed sensing and laser generation in recent years. Their high sensitivity, ease of integration, and real-time monitoring capabilities have positioned them as a focal point in optical fiber sensing. This paper systematically introduces the structures and characteristics of various tapered optical fiber sensors, providing a comprehensive overview of their applications in biosensing, environmental monitoring, and industrial surveillance. Furthermore, it offers insights into the developmental trends of tapered optical fiber sensing, providing valuable references for future related research and suggesting potential directions for the further advancement of optical fiber sensing.

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Section: Fiber Interferometermentioning

confidence: 99%

The Structure and Applications of Fused Tapered Fiber Optic Sensing: A Review

Ban,

Lian

2024

Photonics

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“…The frequency of the intensity modulator must ensure that there is only one set of pulses in the fiber loop. Due to the trade-off problem between the frequency and width of the pulse, the length of fiber loop needs to be considered [18] and the ring down time is also greatly influenced by the narrower pulse width [19], [20].…”

Section: Introductionmentioning

confidence: 99%

Formation of Fiber Tapers by Chemical Etching for Application in Chaotic Correlation Fiber Loop Ring Down Sensing

Yang

Tian

et al. 2021

IEEE Photonics J.

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Fiber loop ring down spectroscopy has been developed into a high-sensitivity technique for sensing many important characteristics of samples, such as refractive index. In contrast to the previous demonstrations by using mode-locked fiber laser, this work is demonstrated to use chaotic laser combined with fiber loop ring down sensor. The formation and performance of fiber tapers was monitored by combining chaotic fiber ring down technology on line and in real time. Two sets of refractive index sensing experiments are performed and further analyzed by using the proposed setup. The results are shown that the detection limit of the chaotic correlation fiber loop ring down system is 3.45×10-4 RIU and the sensitivity is 0.0682 ns-1 RIU-1 in 6.7 m, respectively. The performance of our system can be drastically improved by increasing the length of the etched fiber tapers to be tens of centimeters using the chaotic correlation fiber loop ring down system with the smaller fiber ring lengths.

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“…They also utilized a similar multichannel setup for pressure sensing where the sensing location was also determined by working out the distance using the signal in the spatial domain. 48 For simplification of the input-output systems in fiber-based CRDS, the utilization of an optical time domain reflectometer (OTDR) has been observed, 41,45,49 wherein an OTDR sends a pulsed optical input to a fiber and analyzes the reflected or scattered light from the fiber. The OTDR response is given in decibels, which enables a linear output that can be better correlated to the sample attenuation and would reduce errors that arise in fitting of exponential ring-down time decay plots.…”

mentioning

confidence: 99%

“…A similar setup was employed by Yuksel and group, where the effect of OTDR pulse widths on the decay was investigated 8 along with the response to a variable attenuation. On the other hand, Li et al 49 used an arrangement of a tapered fiber having a Faraday rotator mirror at its end, where the fiber acted as a refractive index sensor while the Faraday mirror acted as a reflective element. The fiber was designed asymmetrically with microbends to create interference, and the reflection spectrum of the fiber along with the mirror shifted in response to the changing refractive index of the medium external to the fiber.…”

mentioning

confidence: 99%