Evaluation of an Erbium-Doped Fiber Ring Laser as an Edge Filtering Device for Fiber Bragg Grating Sensor Interrogation

An easy-to-implement and cost-effective Fiber Bragg Grating (FBG) sensor interrogation technique based on a ring Erbium-Doped Fiber Laser (EDFL) topology is proposed and experimentally assessed. The FBG sensor is part of the EDFL cavity and must have a central wavelength located within the linear re...

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Bibliographic Details
Published in:Photonics 2024-05, Vol.11 (5), p.407
Main Authors: Stathopoulos, Nikolaos A., Lazakis, Christos, Simos, Iraklis, Simos, Christos
Format: Article
Language:English
Subjects:
Analysis
Bragg gratings
Doped fibers
Equipment and supplies
Erbium
erbium-doped optical fibers
Evaluation
Fiber Bragg Gratings
Fiber lasers
fiber optic sensors
Fiber optics
Filtration
Interrogation
Laser outputs
Lasers
Pumping
Ring lasers
Sensors
Spectrum analysis
Spontaneous emission
Topology
Wavelength
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Summary:An easy-to-implement and cost-effective Fiber Bragg Grating (FBG) sensor interrogation technique based on a ring Erbium-Doped Fiber Laser (EDFL) topology is proposed and experimentally assessed. The FBG sensor is part of the EDFL cavity and must have a central wavelength located within the linear region of the EDF’s amplified spontaneous emission (ASE) spectrum, which occurs at between 1530 and 1540 nm. In this manner, the wavelength-encoded response of the FBG under strain is converted to a linear variation in the laser output power, removing the need for spectrum analysis as well as any limitations from the use of external edge-filtering components. In addition, the laser linewidth is significantly reduced with respect to the FBG bandwidth, thus improving the resolution of the system, whereas its sensitivity can be controlled through pumping power. The performance of the system has been characterized by modeling and experiments for EDFs with different lengths, doping concentrations, and pumping power levels. The influence of mode-hopping in the laser cavity on the resolution and accuracy of the system has also been investigated.
ISSN:2304-6732
2304-6732
DOI:10.3390/photonics11050407