Results 21 to 30 of about 9,155 (235)
Multi-Harmonic Bragg Gratings [PDF]
Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides, 1999 Multi-harmonic Fibre Bragg Gratings have been demonstrated experimentally and studied in detail theoretically showing complex reflection response and band-gap disappearance.
Zervas, M.N. +3 more
openaire +1 more source
Fluorinated Polyimide-Film Based Temperature and Humidity Sensor Utilizing Fiber Bragg Grating
Sensors, 2020 We propose and demonstrate a temperature and humidity sensor based on a fluorinated polyimide film and fiber Bragg grating. Moisture-induced film expansion or contraction causes an extra strain, which is transferred to the fiber Bragg grating and leads ...
Xiuxiu Xu +3 more
doaj +1 more source
Energies, 2022 The anchoring quality of bolts is related to roadway safety and the surrounding rock stability. Due to the limitations of conventional monitoring methods in capturing strain, there still exists a gap in the real-time perception of the mechanical ...
Gaochuan Guo +4 more
doaj +1 more source
A Fiber Bragg Grating-Based Anemometer [PDF]
Sensors, 2018 A novel fiber anemometer based on two pairs of fiber gratings is experimentally demonstrated and can simultaneously detect wind speed and wind direction. One pair of gratings, which are separated by 90° in space, is fixed on a small stainless steel pipe driven by a rotating disc for measuring the wind-direction angle.
Huang, Chuan-Ying +3 more
openaire +3 more sources
Silicon graphene Bragg gratings
Optics Express, 2014 We propose the use of interleaved graphene sections on top of a silicon waveguide to implement tunable Bragg gratings. The filter central wavelength and bandwidth can be controlled changing the chemical potential of the graphene sections. Apodization techniques are also presented.
Capmany, Jose +2 more
openaire +3 more sources
A New Type of Etched Fiber Grating Hydrophone
Photonics, 2022 We propose a new type of fiber hydrophone composed of an etched fiber Bragg grating and a special packaging structure for detecting acoustic waves in the low-frequency band under water.
Wen-Fung Liu +4 more
doaj +1 more source
Graphene Bragg gratings on microfiber
Optics Express, 2014 Graphene Bragg gratings (GBGs) on microfiber are proposed and investigated in this paper. Numerical analysis and simulated results show that the mode distribution, transmission loss, and central wavelength of the GBG are controllable by changing the diameter of the microfiber or the refractive index of graphene.
B C, Yao +9 more
openaire +2 more sources
Modelling of Photonic Wire Bragg Gratings [PDF]
Optical and Quantum Electronics, 2006 Some important properties of photonic wire Bragg grating structures have been investigate. The design, obtained as a generalisation of the full-width gap grating, has been modelled using 3D finite-difference time-domain simulations. Different types of stop-band have been observed.
M. Gnan +4 more
openaire +3 more sources
Bragg gratings inscription in weakly-doped fibers
Results in Physics, 2019 The results of an investigation of the Bragg gratings inscription processes in weakly-doped fibers with different dopants without preliminary hydrogen-loading are presented in this work.
Oleg V. Butov
doaj +1 more source
Nonreciprocal waveguide Bragg gratings
Optics Express, 2005 The use of a complex short-period (Bragg) grating which combines matched periodic modulations of refractive index and loss/gain allows asymmetrical mode coupling within a contra-directional waveguide coupler. Such a complex Bragg grating exhibits a different behavior (e.g.
Mykola, Kulishov +4 more
openaire +2 more sources