Results 141 to 150 of about 1,111 (187)

Writing and applications of fiber Bragg grating arrays

SPIE Proceedings, 2000
Multiple Bragg gratings are written in a single fibre strand with accurate positioning to achieve predetermined time delays between optical channels. Applications of fibre Bragg grating arrays include encoders/decoders with series of identical gratings for optical code-division multiple access.
Sophie LaRochelle, Pierre-Yves Cortes, H. Fathallah, Leslie A. Rusch, H. B. Jaafar   +4 more
openaire   +1 more source

Demodulation of a weak fiber Bragg grating array using a fiber delay line

Applied Optics, 2020
We demonstrate the use of a fiber delay line (FDL) to demodulate a weak fiber Bragg grating (WFBG) array. The FDL is composed of a fiber-ring cavity, by which the delay time is matched with the interval length of the adjacent WFBGs. Two pulses reflected by the former WFBG with delay and a pulse reflected by the rear WFBG without delay overlap and ...
Peng, Ding, Wen, Liu, Hongcan, Gu, Yunyun, Wang, Jing, Wu, Junbin, Huang, Jinsong, Tang   +6 more
openaire   +2 more sources

Interrogation of a dual fiber Bragg grating sensor using an arrayed waveguide grating

SPIE Proceedings, 2005
In this paper we consider the possibility of improving the accuracy of a fiber Bragg grating (FBG) interrogation system by, instead of using one FBG, using two inscribed on the same location of the fiber with a small difference in the peak wavelength each reflects.
Robertson, D.C., Niewczas, P., McDonald, J.R.   +2 more
openaire   +3 more sources

Coating based fiber Bragg grating humidity sensor array

SPIE Proceedings, 2012
A coating based FBG humidity sensor is developed for distributed humidity sensing. The sensitivity of the coated FBG is optimized by varying the chemical composition and the thickness of the coating. A sensitivity of ~2 pm/%RH and a rapid response are demonstrated. The composition of the coating can be adapted for sensing other chemical elements.
Cheng, L.K., Boersma, A., Jansen, T.H.
openaire   +2 more sources

Arrayed waveguide grating interrogator for fiber Bragg grating sensors: measurement and simulation

Applied Optics, 2012
A fiber Bragg grating (FBG) interrogation system based on an intensity demodulation and demultiplexing of an arrayed waveguide grating (AWG) module is examined in detail. The influence of the spectral line shape of the FBG on the signal obtained from the AWG device is discussed by accomplishing the measurement and simulation of the system.
Jan, Koch, Martin, Angelmahr, Wolfgang, Schade   +2 more
openaire   +2 more sources

Optical fiber Bragg gratings Part II Modeling of finite-length gratings and grating arrays

Journal of the Optical Society of America A, 2002
A model of both uniform finite-length optical fiber Bragg gratings and grating arrays is presented. The model is based on the Floquet-Bloch formalism and allows rigorous investigation of all the physical aspects in either single- or multiple-periodic structures realized on the core of a monomodal fiber.
Vittorio Passaro, Roberto Diana, Mario N. Armenise   +2 more
openaire   +2 more sources

Fiber Bragg grating sensor array for detecting heat flux in vacuum

Review of Scientific Instruments, 2022
In TAE Technologies’ current experimental device, C-2W (also called “Norman”), record-breaking, advanced beam-driven field-reversed configuration plasmas are produced and sustained in steady state utilizing variable energy neutral beams, advanced divertors, edge-biasing electrodes, and an active plasma control system [Gota et al., Nucl.
J. B. Titus, M. E. Griswold, E. M. Granstedt, R. M. Magee, N. Charkhesht, J. H. Schroeder, M. Meekins, I. Allfrey   +7 more
openaire   +2 more sources

Performance analysis of the Fiber Bragg grating Interrogation system based on an arrayed waveguide grating

Proceedings of the 20th IEEE Instrumentation Technology Conference (Cat. No.03CH37412), 2004
In this paper we analyze performance of the Fiber Bragg Grating (FBG) Interrogation System based on an Arrayed Waveguide Grating (AWG) device. The spectrum of light reflected from the FBG sensor is analyzed using an AWG which acts as a coarse spectrometer.
Pawel Niewczas, Andrew J. Willshire, Lukasz Dziuda, James R. McDonald   +3 more
openaire   +1 more source

Fiber Bragg grating interrogating system employing an arrayed waveguide grating

2007 Asia Optical Fiber Communication and Optoelectronics Conference, 2007
Two types of interrogating schemes based on an waveguide grating for fiber Bragg grating sensors are reviewed. A method of extending the wavelength measuring range is proposed. And experiment results match well with the theory.
null Zhou Qinfeng, null Xu Tiefeng
openaire   +1 more source

The Stretch-and-write Technique for Fabrication of Fiber Bragg-grating Arrays

2005
The photolithographic method with the improvement of the stretch-and-write technique was applied for the fabrication of fiber-Bragg grating arrays. This procedure allows to change the grating peak wavelength utilizing a single phase mask. A properly designed apparatus was described to write spatially and spectrally well separated grating arrays ...
R.Falciai, R.Fontana, A.Schena
openaire   +2 more sources