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16 May 2008Triple wavelength SOA-based fiber ring laser for use in wavelength-division multiplexed FBG vibration sensor array
A multi-wavelength tunable fiber laser is constructed for a wavelength-division multiplexed (WDM) fiber Bragg grating
(FBG) sensor array in which simultaneous detection of multipoint vibrations and temperature stabilization of the sensor
outputs are achieved. The laser consists of a semiconductor optical amplifier (SOA) as a gain medium and of FBGs as
wavelength selection components. Since the SOA is an inhomogeneous broadening gain medium, stable multi-wavelength
oscillation at the Bragg wavelengths of the FBGs can be realized. In addition, the oscillation wavelengths of
the laser can be tuned by applying strain to the FBGs used. In the sensor scheme, triple wavelength fiber laser is
fabricated, in which the three wavelength components provide narrowband light sources for arrayed WDM FBG sensors
and the wavelength tuning enables temperature compensation for the vibration detection. In the experiment,
simultaneous three-point vibration detection with temperature stabilization has been successfully demonstrated.
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S. Tanaka, H. Somatomo, K. Inamoto, N. Takahashi, "Triple wavelength SOA-based fiber ring laser for use in wavelength-division multiplexed FBG vibration sensor array," Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 70040F (16 May 2008);