A novel and simple multi-wavelength fiber ring laser has been developed to implement an
optical source of a fiber Bragg grating (FBG) sensor array in which respective wavelength component of
the oscillation output provides an optical source of one of the wavelength-division multiplexed (WDM)
FBG vibration sensors. The laser consists of a semiconductor optical amplifier (SOA) as a gain medium
and of FBGs as wavelength selection elements. Since an SOA is an inhomogeneous gain medium, stable
multi-wavelength oscillation can be realized to serve an optical source for the FBG vibration sensor array.
In the experiment, a dual-wavelength fiber ring laser has been fabricated and tested, and simultaneous
two-point vibration measurement has been successfully demonstrated.
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