Temperature sensing using an optical time domain reflectometer and mechanical long-period fiber gratings fabricated from a heat-shrinkable tube

Ohashi, M.; Miyoshi, Y.

doi:10.1587/comex.2016xbl0189

Cited by 4 publications

(7 citation statements)

References 12 publications

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“…Further studies are required to determine the underlying cause for this estimation error. However, the resonance loss and resonance wavelength are the most critical for MLPFGs that are used as sensors [2,3,4,5]. Therefore, we believe that our proposed model is useful for estimating the properties of fabricated MLPFGs.…”

Section: Discussionmentioning

confidence: 98%

“…Moreover, MLPFGs have unique advantages including simple fabrication, immunity to electromagnetic interference, resistance against fire or sparks, and compatibility with remote and multiplex operation [2]. Therefore, MLPFGs have been extensively studied for use in cost-effective and highly functional optical sensors or devices [2,3,4,5].…”

Section: Introductionmentioning

confidence: 99%

“…2. We estimated the coupling coefficients, κ and σ, as a function of the applied pressure according to (4) and (5) using the measured spectra. Fig.…”

Section: Introductionmentioning

confidence: 99%

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Model for estimating the properties of mechanically induced long-period fiber grating based on polarization and applied pressure

et al. 2017

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This study proposes a model for estimating the properties of mechanically induced long-period fiber gratings (MLPFGs) based on polarization and applied pressure. The model arises from the linear relation between the applied pressure and coupling coefficients of MLPFGs through utilization of Jones matrix analysis. The transmission property of a fabricated MLPFG can be easily estimated using the relation between the applied pressure and coupling coefficients obtained from the measured spectra of MLPFGs. The estimated spectra around the resonance wavelengths based on our proposed model show good agreement with the measured ones. Keywords: long-period fiber grating, polarization dependence, applied pressure dependence Classification: Sensing strain sensitivity based on long-period gratings in B/Ge co-doped fiber," Electron. Lett., vol. 35, no. 8, pp. 661-663, 1999. DOI:10.1049 Y. Tsutsumi, M. Ohashi, and Y. Miyoshi, "Temperature sensing using an optical time domain reflectometer and mechanical long-period fiber gratings fabricated from a heat-shrinkable tube," IEICE Commun. References

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Model for estimating the properties of mechanically induced long-period fiber grating based on polarization and applied pressure

et al. 2017

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“…Additionally, MI-LPFGs are wide tunable with flexible control of depth attenuation and bandwidth of the rejection bands, and they are reversible. These properties make MI-LPFGs attractive for actual uses, such as variable gain shapers, mode converters, wavelength filters, and sensors, among other applications [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Mechanically-Induced Long-Period Fiber Gratings Using Laminated Plates

Torres-Gómez

Ceballos-Herrera

Salas-Alcántara

2020

Sensors

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This work presents a formation method of mechanically-induced long-period fiber gratings using laminated plates. The mechanically-induced long-period fiber grating is temporarily inscribed by compressing the optical fiber between a flat plate and the proposed laminated plate. In turn, the new laminated plate consists of a parallel assembling of single-edged utility blades. We present the experimental characterization of mechanically-induced long-period fiber gratings while employing three laminated plates with a period of 480 ± 20 µm and low duty cycles. These mechanically-induced long-period fiber gratings display a leading rejection band (>15 dB) with a couple of shallow rejection bands (<2 dB) in the range of 1100–1700 nm. This spectral behavior is due to the new mechanical fabrication process that is based on laminated plates that we have proposed, which consists of piling multiple blades with trapezoidal edges that are polished with different levels to obtain different duty-cycles. With the proposed method, we can obtain values of duty-cycles around 10%, much lower than those obtained using traditional methods. Additionally, with this new method, the required mechanical pressure to form the grating is remarkably reduced, which minimizes the probability of the optical fiber failure in the mechanically-induced long-period fiber gratings (MI-LPFGs). Moreover, the proposed mechanically-induced long-period fiber gratings with a single rejection band open the feasibility to implement coarse wavelength division multiplexing systems that are based on long-period fiber gratings.

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“…Optical fiber sensors are immune to electromagnetic noise, and sensor heads do not conduct electricity; hence, excellent explosion proofness and other merits. Particularly, mechanically induced long‐period fiber gratings (MLPFGs) feature a simple structure and relatively inexpensive manufacture, while their light transmission spectra vary with MLPFG temperature, strain, external refractive index, and other parameters; a number of studies were conducted on sensor applications 1–5 . MLPFG is an optical device provided with diffraction grating formed through periodical compression so that refractive index of optical fiber periodically changes 6,7 .…”

Section: Introductionmentioning

confidence: 99%

Cladding mode loss effect on transmission characteristics of mechanically induced long‐period fiber gratings

Kitahara

Ohashi

Kubota

et al. 2020

Elect Comm in Japan

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In the mechanically induced long‐period fiber grating (MLPFG) fabricated by applying the periodical pressure on an optical fiber, the small bending occurs due to the periodical pressure, which influences the losses of the core and cladding modes. We propose the theoretical model of the MLPFG for estimating its transmittance based on the transfer matrix method and investigate the effect of the losses of the core and cladding modes in the MLPFG on the transmittance, theoretically and experimentally. We numerically clarify that the transmitted light spectrum of MLPFG shows only the main attenuation lobe, no side lobe, and the attenuation bandwidth is broadened as the cladding mode loss increases. We also clarify that the coupling coefficient, and the losses of the core and cladding modes in the fabricated MLPFG can be estimated from the measured transmitted spectrum based on our model. Moreover, we measure the transmittance of two types of MLPFGs that fabricated with a screw, weights, and metallic plates, and that fabricated with a screw and a heat‐shrinkable tube. The measured spectra show good agreements with the calculated ones using our model. Our model will be useful for designing MLPFGs applied to the sensors.

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Temperature sensing using an optical time domain reflectometer and mechanical long-period fiber gratings fabricated from a heat-shrinkable tube

Cited by 4 publications

References 12 publications

Model for estimating the properties of mechanically induced long-period fiber grating based on polarization and applied pressure

Model for estimating the properties of mechanically induced long-period fiber grating based on polarization and applied pressure

Mechanically-Induced Long-Period Fiber Gratings Using Laminated Plates

Cladding mode loss effect on transmission characteristics of mechanically induced long‐period fiber gratings

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