Analysis of the tunable asymmetric fiber F-P cavity for fiber strain sensor edge-filter demodulation

Chen, Haotao; Liang, Youcheng

doi:10.1007/s13320-014-0158-3

Cited by 10 publications

(4 citation statements)

References 12 publications

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“…A stable, broadband multi-wavelength fiber ring laser for dense wavelength-division multiplexing systems is reported to achieve stable wavelength output through thin-film FP filters, with a wavelength shift of less than 0.016 nm over 10 min [11]. An edge-filtering demodulation system for FBG sensors with tunable asymmetric fiber F-P cavities prepared by depositing simply structured multilayer films on the fiber end face is reported, which can be effectively used for the measurement of weak signals with a wavelength resolution of 0.01 picometers and a linear wavelength shift range of 7 nm [12].…”

Section: Introductionmentioning

confidence: 99%

Mode Shift of a Thin-Film F-P Cavity Grown with ICPCVD

Zhang,

Gao,

Duan

et al. 2024

Photonics

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Industrial-grade optical semiconductor films have attracted considerable research interest because of their potential for wafer-scale mass deposition and direct integration with other optoelectronic wafers. The development of optical thin-film processes that are compatible with complementary metal-oxide-semiconductor (CMOS) processes will be beneficial for the improvement of chip integration. In this study, a multilayer periodically structured optical film containing Fabry–Perot cavity was designed, utilizing nine pairs of SiN/SiO2 dielectrics. Subsequently, the multilayer films were deposited on Si substrates through the inductively coupled plasma chemical vapor deposition (ICPCVD) technique, maintaining a low temperature of 80 °C. The prepared films exhibit narrow bandpass characteristics with a maximum peak transmittance of 76% at 690 nm. Scanning electron microscopy (SEM) shows that the film structure has good periodicity. In addition, when the optical films are exposed to p/s polarized light at different angles of incidence, the cavity mode of the film undergoes a blueshift, which greatly affects the color appearance of the film. As the temperature rises, the cavity mode undergoes a gradual redshift, while the full width at half maximum (FWHM) and quality factor remain relatively constant.

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Section: Introductionmentioning

confidence: 99%

Mode Shift of a Thin-Film F-P Cavity Grown with ICPCVD

Zhang,

Gao,

Duan

et al. 2024

Photonics

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“…Other popular demodulation methods using broadband light sources include interferometric techniques and methods using optical filters. Examples include a Fabry–Perot interferometer [ 12 ] as well as edge filters with different spectral characteristics [ 13 ]. To transform the FBG spectrum shift into photodetector power, an optical element whose spectral characteristics depend monotonically on the wavelength can be used.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Analysis of Matched Filter Interrogation of FBG Sensors with Large Side Lobes

Skorupski

Cięszczyk

Panas

et al. 2020

Sensors

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This article presents the effect of fiber Bragg gratings side lobes on interrogation systems consisting of sensor and matched filters. The conducted research shows that high-value side lobe structures applied as sensors and/or filters are characterized by some interesting properties. The paper presents both numerical analysis and experimental verification of the fiber Bragg gratings (FBG) interrogation systems with matched filters for gratings containing high side lobes. Numerical modeling of Bragg structures was performed for two different cases: uniform and inverse apodization. Modification of apodization can change the side lobe reflectance level even above levels found in uniform structures. This is a case not described in the literature, especially in terms of possible applications. Transfer characteristics, i.e., the relationship between power intensity as a function of wavelength shift, were determined. A collection of gratings with spectra corresponding to those analyzed in numerical experiments were fabricated. Next, the transfer characteristics of the interrogation systems containing real FBG were determined. The properties of the proposed systems are described. It has been shown that a significant level of sidebands, which is often the subject of many drawbacks in filtering or telecommunications systems, can be an advantage. It has been demonstrated that a high level of side lobes can be used to increase the measurement range of the FBG sensor interrogation systems. It has been determined numerically and confirmed experimentally that from the point of view of the design of sensor interrogation systems, it is beneficial to combine specific pairs of gratings: one with a spectrum characterized by a low side lobe level and a second one in which the spectrum has very high side lobes.

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“…With the widespread use of digital techniques in instrumentation and communication systems, full digital demodulation has become the current trend of fiber-optic Fabry-Perot sensor demodulation, which has the advantages of high speed, high precision, and good stability. However, the traditional full digital demodulation method still combines with large optical instruments [11][12][13][14]. This paper proposes a new demodulation algorithm based on the phase generated carrier (PGC) arc tangent function and the analysis of several mature demodulation methods.…”

Section: Introductionmentioning

confidence: 99%

An arc tangent function demodulation method of fiber-optic Fabry-Perot high-temperature pressure sensor

Ren

Hong

et al. 2017

Photonic Sens

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Abstract:A new demodulation algorithm of the fiber-optic Fabry-Perot cavity length based on the phase generated carrier (PGC) is proposed in this paper, which can be applied in the high-temperature pressure sensor. This new algorithm based on arc tangent function outputs two orthogonal signals by utilizing an optical system, which is designed based on the field-programmable gate array (FPGA) to overcome the range limit of the original PGC arc tangent function demodulation algorithm. The simulation and analysis are also carried on. According to the analysis of demodulation speed and precision, the simulation of different numbers of sampling points, and measurement results of the pressure sensor, the arc tangent function demodulation method has good demodulation results: 1 MHz processing speed of single data and less than 1% error showing practical feasibility in the fiber-optic Fabry-Perot cavity length demodulation of the Fabry-Perot high-temperature pressure sensor.

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Analysis of the tunable asymmetric fiber F-P cavity for fiber strain sensor edge-filter demodulation

Cited by 10 publications

References 12 publications

Mode Shift of a Thin-Film F-P Cavity Grown with ICPCVD

Mode Shift of a Thin-Film F-P Cavity Grown with ICPCVD

Numerical and Experimental Analysis of Matched Filter Interrogation of FBG Sensors with Large Side Lobes

An arc tangent function demodulation method of fiber-optic Fabry-Perot high-temperature pressure sensor

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