Bending sensitivity of long-period fiber gratings inscribed in holey fibers depending on an axial rotation angle

Han, Young‐Geun; Kim, Gilhwan; Lee, Kwanil; Lee, Sang Bae; Jeong, Chang Hyun; Oh, Chi Hwan; Kang, Hee Jeon

doi:10.1364/oe.15.012866

Cited by 29 publications

(8 citation statements)

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“…Thus the strain sensitivity strongly depends on the second term in Eq. (4) for the waveguide contribution [14]. Since the slope of the dispersion term,    in the PS-PCF is negative, a blue shift was observed as shown in FIG.…”

Section: Spectral Strain Characteristic Of the Lpfg In The Ps-pcfmentioning

confidence: 90%

Investigation of an Arc-induced Long Period Fiber Grating Inscribed in a Photonic Crystal Fiber with Two Large Air Holes

Kim¹,

Kim²,

Hwang³

et al. 2009

Journal of the Optical Society of Korea

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A photonic crystal fiber with two large air holes outside the holey cladding region is fabricated to induce an effective long periodic grating (LPG) in the core by an electric arc discharge. We believe that the two large air holes lead to the asymmetric perturbation in the core under the electric arc discharge, thereby introducing the coupling to the first higher-order mode. The transmission characteristics of the PCF with the LPG for the external perturbation such as strain, curvature, and temperature are also investigated. It was found that the shift of resonance peak in the transmission spectrum depends on the bending direction. The curvature of 8.55 m -1 results in the center wavelength shifts of 1.8, 4.3, and 11 nm for a vertical, diagonal, and horizontal direction of the curvature to the large air-hole alignment, respectively.

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Section: Spectral Strain Characteristic Of the Lpfg In The Ps-pcfmentioning

confidence: 90%

Investigation of an Arc-induced Long Period Fiber Grating Inscribed in a Photonic Crystal Fiber with Two Large Air Holes

Kim¹,

Kim²,

Hwang³

et al. 2009

Journal of the Optical Society of Korea

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“…6,7 In generally, the curvature sensors based on gratings characterize low bending sensitivity. To enhance the detection sensitivity, some modifications in waveguide structures, such as dual side-hole fiber, 8,9 eccentric core fiber (ECF), 10 multicore fiber, 11 holey fibers 12 and multicladding fiber, 13 have been employed for curvature sensing. Others employing optical fiber interferometers, such as Mach-Zehnder interferometer MZI, 14 Fabry-Pérot interferometer (FPI), 15 and Sagnac interferometer 16 are widely investigated for measurement of curvature.…”

Section: Introductionmentioning

confidence: 99%

Fiber curvature sensor based on concave‐heterotypic cascaded fiber Sagnac interferometer

Ruan

2020

Micro & Optical Tech Letters

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A fiber optical curvature sensor comprising a concave‐heterotypic cascaded fiber structure built into Sagnac loop is demonstrated experimentally. A section of multimode fiber is sandwiched between the single mode fiber and polarization maintaining fiber in order to construct the concave‐heterotypic cascaded fiber structure. The concave structure presented is used to effectively excite guided modes. The spectra of the proposed bending sensor will shift toward long wavelength with curvature. The measured the curvature sensitivity of 11.6 nm/m−1 has been achieved. The proposed curvature sensor characterizes cost‐efficient, simple fabrication process and can be used for health monitoring in civil engineering.

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“…Specifically, some researchers detected bending direction by fabricating general FBGs or LPFGs in specially-designed fibers. These include eccentric core fibers (ECF) [11,12], multi-core fibers [13], holey fibers [14], multi-mode fibers (MMF) [15] or photonic crystal fibers (PCF) [16], D-shaped cladding fibers [17] and general fibers that have asymmetrical refractive index gratings inscribed into them with a laser [18,19,20,21,22]. However, the FBG- and LPFG-based directional bending sensors are complicated and expensive to fabricate.…”

Section: Introductionmentioning

confidence: 99%

In-Fiber Mach-Zehnder Interferometer Based on Three-Core Fiber for Measurement of Directional Bending

Ding

Zhou

et al. 2019

Sensors

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A highly sensitive directional bending sensor based on a three-core fiber (TCF) Mach-Zehnder interferometer (MZI) is presented in this study. This MZI-based bending sensor was fabricated by fusion-splicing a section of TCF between two single-mode fibers (SMF) with core-offset. Due to the location of the core in the TCF, a bend applied to the TCF-based MZI led to an elongation or shortening of the core, which makes the sensor suitable for directional bending measurement. To analyze the bending characteristics, two types of TCF-based sensors, with the fusion-spliced core located at different positions between the SMFs, were investigated. A swept source was employed in the measurement technique. The experimental results showed that, for the two types of sensors in this setup, the bending sensitivities of the two sensors were 15.36 nm/m−1 and 3.11 nm/m−1 at the bending direction of 0°, and −20.48 nm/m−1 and −5.29 nm/m−1 at the bending direction of 180°. The temperature sensitivities of the two sensors were 0.043 nm/°C and 0.041 nm/°C, respectively. The proposed sensors are compact, versatile, inexpensive to fabricate, and are expected to have potential applications in biomedical sensing.

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Bending sensitivity of long-period fiber gratings inscribed in holey fibers depending on an axial rotation angle

Cited by 29 publications

References 0 publications

Investigation of an Arc-induced Long Period Fiber Grating Inscribed in a Photonic Crystal Fiber with Two Large Air Holes

Investigation of an Arc-induced Long Period Fiber Grating Inscribed in a Photonic Crystal Fiber with Two Large Air Holes

Fiber curvature sensor based on concave‐heterotypic cascaded fiber Sagnac interferometer

In-Fiber Mach-Zehnder Interferometer Based on Three-Core Fiber for Measurement of Directional Bending

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