Multichannel Fiber-Optic Silicon Fabry–Pérot Interferometric Bolometer System for Plasma Radiation Measurements

A single-channel fiber-optic bolometer system based on a high-finesse silicon Fabry–Pérot interferometer (FPI) was previously reported, intended to measure plasma radiation from the magnetically confined fusion chamber. Recently, we developed a multichannel fiber-optic bolometer system with five bolometers multiplexed using a coarse wavelength division multiplexer (CWDM) and interrogated with a white-light system involving a superluminescent light-emission diode source and a high-speed spectrometer. One of the bolometers was used as the reference bolometer to compensate for the ambient temperature variations, and the other four bolometers were used for radiation measurement. The bolometers have a simple structure with a silicon pillar at the end of the single-mode fiber and a gold disk on the other side of the silicon pillar. They are also easy to fabricate without stringent requirements on the optical alignment. Analysis of the system optimization was performed to improve the noise performance and to mitigate the vibration effect that may present in the practical application. The system had a significantly enhanced measurement range compared to the previous high-finesse FPI bolometer system for measuring radiation. Test results performed in air using a 405 nm laser as the radiation source showed that the temperature resolution and the noise-equivalent power density of the sensing bolometers connected to each channel of the CWDM were, respectively, ~0.4 mK and ~0.1 W/m2, with a time constant of ~220 ms, which is comparable to the previous more complicated fiber-optic bolometer systems based on high-finesse FPIs that were interrogated using wavelength-scanning lasers.

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Tributary Mapping Multiplexing an Efficient Technique for High Speed Fiber Optic Communication

Pakistan Journal of Engineering Technology & Science ◽

10.22555/pjets.v6i2.1963 ◽

2018 ◽

Vol 6 (2) ◽

Author(s):

Usman Illahi ◽

Javed Iqbal ◽

Muhammad Ismail Sulaiman ◽

Muhammad Alam ◽

Mazliham Mohd Su'ud

Keyword(s):

Spectral Efficiency ◽

High Speed ◽

Fiber Optic ◽

Single Channel ◽

Efficient Technique ◽

High Dispersion ◽

Optical Filtering ◽

Fiber Optic Communication ◽

Optic Communication ◽

Dispersion Tolerance

<p>A novel technique of multiplexing called Tributary Mapping Multiplexing (TMM) is<br />applied to a single channel wavelength division multiplexing system and performance is monitored on the basis of simulation results. To elaborate the performance of TMM in this paper, a 4-User TMM system over single wavelength channel is demonstrated. TMM showed significant tolerance against narrow optical filtering as compared to that of conventional TDM at the rate of 40 Gbit/s. The above calculations are made by optical filter bandwidth and dispersion tolerance that was allowed at minimum. The spectral efficiency achieved by this TMM was 1 b/s/Hz and it was executed by using transmitters and receivers of 10 Gbit/s without polarized multiplexing. The high spectral efficiency, high dispersion tolerance and tolerance against strong optical filtering makes TMM an efficient technique for High<br />Speed Fiber Optic Communication.</p>

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Microbubble based fiber-optic Fabry–Perot interferometer formed by fusion splicing single-mode fibers for strain measurement

Applied Optics ◽

10.1364/ao.51.001033 ◽

2012 ◽

Vol 51 (8) ◽

pp. 1033 ◽

Cited By ~ 90

Author(s):

De-Wen Duan ◽

Yun-jiang Rao ◽

Yu-Song Hou ◽

Tao Zhu

Keyword(s):

Strain Measurement ◽

Fiber Optic ◽

Single Mode ◽

Fabry Perot

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A mechanical amplifier based high-finesse fiber-optic Fabry–Perot interferometric sensor for the measurement of static magnetic field

Measurement Science and Technology ◽

10.1088/1361-6501/ac2199 ◽

2021 ◽

Vol 32 (12) ◽

pp. 125106

Author(s):

Xinxing Feng ◽

Yi Jiang ◽

Han Zhang

Keyword(s):

Magnetic Field ◽

Static Magnetic Field ◽

Fiber Optic ◽

Fabry Perot ◽

Interferometric Sensor ◽

High Finesse

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Preparation and Characterization of Microsphere ZnO ALD Coating Dedicated for the Fiber-Optic Refractive Index Sensor

Nanomaterials ◽

10.3390/nano9020306 ◽

2019 ◽

Vol 9 (2) ◽

pp. 306 ◽

Cited By ~ 7

Author(s):

Paulina Listewnik ◽

Marzena Hirsch ◽

Przemysław Struk ◽

Matthieu Weber ◽

Mikhael Bechelany ◽

...

Keyword(s):

Refractive Index ◽

Optical Fiber ◽

Fiber Optic ◽

Single Mode ◽

Atomic Layer ◽

Fiber Optic Sensor ◽

Refractive Index Sensor ◽

Layer Deposition ◽

Fabry Perot

We report the fabrication of a novel fiber-optic sensor device, based on the use of a microsphere conformally coated with a thin layer of zinc oxide (ZnO) by atomic layer deposition (ALD), and its use as a refractive index sensor. The microsphere was prepared on the tip of a single-mode optical fiber, on which a conformal ZnO thin film of 200 nm was deposited using an ALD process based on diethyl zinc (DEZ) and water at 100 °C. The modified fiber-optic microsphere was examined using scanning electron microscopy and Raman spectroscopy. Theoretical modeling has been carried out to assess the structure performance, and the performed experimental measurements carried out confirmed the enhanced sensing abilities when the microsphere was coated with a ZnO layer. The fabricated refractive index sensor was operating in a reflective mode of a Fabry–Pérot configuration, using a low coherent measurement system. The application of the ALD ZnO coating enabled for a better measurement of the refractive index of samples in the range of the refractive index allowed by the optical fiber. The proof-of-concept results presented in this work open prospects for the sensing community and will promote the use of fiber-optic sensing technologies.

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Fiber-Optic Extrinsic Fabry-Perot Interferometer Sensors with Multi-Wavelength Intensity Demodulation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.470.630 ◽

2013 ◽

Vol 470 ◽

pp. 630-635 ◽

Cited By ~ 2

Author(s):

Ning Fang Song ◽

Rui Qi Cui ◽

Yu Jie Yang ◽

Xiao Liang Xu

Keyword(s):

Incident Wave ◽

High Speed ◽

Cavity Length ◽

Fiber Optic ◽

Wave Length ◽

Fabry Perot ◽

Multiple Wavelengths ◽

Large Scope ◽

Multi Wavelength ◽

Novel Method

In this paper, a novel method used for Fabry-Perot cavity length's demodulation in high-speed and large scope measurement was proposed. Principle of the method is based on uniqueness of intensity of multiple wavelengths in the scope of Fabry-Perot vibration. This technique offers flexibility of selecting incident wave length and enhances the scope of demodulation of cavity length, compared with that popular triple wave length demodulation. In experiment, multi-wavelength demodulation is demonstrated for measurement of cavity length varying from 110um to 115um and the strain resolution was higher than 0.1um.

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A High-Speed Demodulation Technology of Fiber Optic Extrinsic Fabry-Perot Interferometric Sensor Based on Coarse Spectrum

Sensors ◽

10.3390/s21196609 ◽

2021 ◽

Vol 21 (19) ◽

pp. 6609

Author(s):

Peng Zhang ◽

Ying Wang ◽

Yuru Chen ◽

Xiaohua Lei ◽

Yi Qi ◽

...

Keyword(s):

Real Time ◽

High Speed ◽

Cavity Length ◽

Fiber Optic ◽

Likelihood Estimation ◽

Time Dynamic ◽

Wavelength Division ◽

Broadband Spectrum ◽

Fabry Perot ◽

Interferometric Sensor

A fast real-time demodulation method based on the coarsely sampled spectrum is proposed for transient signals of fiber optic extrinsic Fabry-Perot interferometers (EFPI) sensors. The feasibility of phase demodulation using a coarse spectrum is theoretically analyzed. Based on the coarse spectrum, fast Fourier transform (FFT) algorithm is used to roughly estimate the cavity length. According to the rough estimation, the maximum likelihood estimation (MLE) algorithm is applied to calculate the cavity length accurately. The dense wavelength division multiplexer (DWDM) is used to split the broadband spectrum into the coarse spectrum, and the high-speed synchronous ADC collects the spectrum. The experimental results show that the system can achieve a real-time dynamic demodulation speed of 50 kHz, a static measurement root mean square error (RMSE) of 0.184 nm, and a maximum absolute and relative error distribution of 15 nm and 0.005% of the measurement cavity length compared with optical spectrum analyzers (OSA).

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