In this manuscript, we propose a new technique to suppress the noise level in an interferometric optical fiber sensing system. Previous work shows that laser frequency noise is the main factor that limits the resolution in a phase generated carrier (PGC) demodulation system. Using a bidirectional pumped random distributed feedback fiber laser (RDFL), the laser frequency noise can be suppressed from 30 Hz/√Hz to 4 Hz/√Hz above 1 kHz. Therefore, the wavelength resolution is improved from 5×10-7 pm/√Hz@ 1 kHz to 5×10-8 pm/√Hz@ 1 kHz.
We present a simple method to measure the 3 dB linewidth of the sharp peak in the spectrum of the fiber Bragg gratingbased Fabry–Perot (FBG-FP) interferometer. A narrow linewidth tunable laser is used for sweeping the FBG-FP to achieve the reflection spectrum. A triangle wave is used to drive the narrow linewidth tunable laser. The linewidth of the sharp peak is measured with a resolution of 0.001 pm.
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