Multiplexing of Fiber-Optic Long-Period Grating-Based Interferometric Sensors

Two long-period gratings (LPGs) fabricated in series in an optical fiber form a Mach-Zehnder interferometer, producing a sinusoidal channelled spectrum within the characteristic LPG attenuation bands, which has the appearance of an interference fringe pattern. The phase of the fringes is sensitive t...

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Bibliographic Details
Published in:Journal of lightwave technology 2007-03, Vol.25 (3), p.825-829
Main Authors: Murphy, R.P., James, S.W., Tatam, R.P.
Format: Article
Language:English
Subjects:
Applied sciences
Attenuation
Bands
Circuit properties
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Fiber gratings
Fiber optics
Frequency
General equipment and techniques
Gratings (spectra)
Information, signal and communications theory
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Integrated optics. Optical fibers and wave guides
Interference
Interferometers
LPG
Mach-Zehnder interferometers
Multiplexing
Optical and optoelectronic circuits
Optical attenuators
Optical device fabrication
Optical fiber sensors
Optical fibers
Optical interferometry
optical-fiber long-period gratings (LPGs)
Physics
Refractive index
Sensor phenomena and characterization
sensors
Sensors (chemical, optical, electrical, movement, gas, etc.)
remote sensing
Signal and communications theory
Telecommunications and information theory
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Description
Summary:Two long-period gratings (LPGs) fabricated in series in an optical fiber form a Mach-Zehnder interferometer, producing a sinusoidal channelled spectrum within the characteristic LPG attenuation bands, which has the appearance of an interference fringe pattern. The phase of the fringes is sensitive to changes in the surrounding environmental parameters, such as refractive index. Fabrication of a number of identical cascaded LPG pairs with different separations produces independent fringe patterns of different frequencies within the attenuation bands. The application of basic Fourier techniques to analyze the transmission spectrum allows the phase of each fringe pattern to be determined independently, facilitating the differentiation of external effects acting on each interferometer
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2006.889670