NDLI: FBG laser sensor with PS

Content Provider	IET Digital Library
Author	Kim, D. H. Kim, H. H. Song, M.
Abstract	Owing to unstable multi-wavelength lasing, robust measurement is difficult with a fibre Bragg grating (FBG) laser sensor system that uses FBGs as laser cavity mirrors as well as sensors. A stabilising technique is essential for proper data acquisition. Here, it is demonstrated that polarisation scrambling (PS) stabilises the output of laser sensor system in combination with a spectrometer demodulation. The state of polarisation (SOP) of a fibre-optic laser cavity is changed by a 1 MHz PS. A 5 kHz spectrometer traces the distribution of output laser wavelengths. The rapid changes in SOP make all the FBG wavelengths lase as long as necessary to determine the Bragg wavelength shifts in the sampling windows of a photo-diode array. A laser sensor system with eight FBG sensors is used to demonstrate robust measurement and data collection under environmental perturbations.
Starting Page	844
Ending Page	846
Page Count	3
ISSN	00135194
Volume Number	54
e-ISSN	1350911X
Issue Number	Issue 13, Jun (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/54/13
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2018.0633
Journal	Electronics Letters
Publisher Date	2018-05-24
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Bragg Gratings Bragg Wavelength Shifts Data Acquisition Demodulation Echelles FBG Laser Sensor FBG Sonsor FBG Wavelengths Fibre Bragg Grating Laser Sensor System Fibre Gyros Fibre Lasers And Amplifier Fibre Optic Sonsor Fibre Optical Device And Technique Fibre Optical Property Fibre-optic Laser Cavity Frequency 5.0 KHz Gratings Laser Accessories And Instrumentation Laser Cavity Mirrors Laser Cavity Resonator Laser Mirrors Laser Resonator And Cavities Laser Stability Optical Fibre Polarisation Optical Interferometry Optical Lenses And Mirrors Optical Spectroscopy And Spectrometers Output Laser Wavelengths PhotoDiode Polarisation Scrambling Spatial Variables Measurement Spectrometer Demodulation Stabilising Technique State of Polarisation Unstable Multiwavelength Lasing
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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