Abstract
sThe interrogation of a Fabry–Perot cavity through
a dual wavelength Raman fiber laser is reported. The proposed sensing system
is based on the use of a dual wavelength Raman fiber laser to generate two
quadrature phase-shifted signals that allow the recovery of the temperature
change sensed by the Fabry–Perot interferometric cavity. The dual
wavelength Raman fiber laser is based on fiber Bragg gratings combined with
a distributed mirror. The Fabry–Perot cavity is fabricated by
splicing a short length of a suspended-core microstructured fiber to a
single mode fiber. The use of this sensing system allows a passive and
accurate interrogation of the temperature, while taking advantage of the
Rayleigh scattering growth as a distributed mirror in the laser.
© 2010 IEEE
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