Abstract
A fiber Bragg grating (FBG) vibration sensor is constructed with two FBGs and an incoherent optical source. One FBG is used as a sensing element which intensity-modulates incident narrow-spectrum light, of which peak wavelength coincides with the slope in the FBG reflection spectrum curve. The narrow-spectrum light is produced by the other FBG in combination with amplified spontaneous emission output of an erbium doped fiber amplifier. Direct detection of the intensity-modulated light yields real time observation of the vibration. The developed sensor shows stable output in proportion to the vibration amplitude without using an optical isolator or fusion splicing, which are commonly used for the stabilization of FBG sensors with laser light as an optical source. Thermally stabilized operation of the sensor would be realized by keeping the temperature of both FBGs the same.
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