Abstract
We propose and experimentally demonstrate an optical fiber sensor based on a Fourier domain mode-locked optoelectronic oscillator (FDML-OEO), which is achieved by synchronizing the period of the driving current of the laser with the round-trip time of the OEO loop. Pulsed microwave output can be obtained when a narrow-band electrical filter with the central frequency located within the frequency scanning range of the FDML-OEO is employed in the cavity. Thanks to the triangle waveform of the laser driving signal, two microwave pulses can be observed in one period. The wavelength shift of the phase-shift fiber Bragg grating (PS-FBG) in the cavity will produce a shift of the frequency scanning range, resulting in the pulse interval variation of the OEO output. The experimental results indicate that the pulse interval of the generated signal has a linear relationship with the notch wavelength shift of the PS-FBG. By applying fiber axial strain to the PS-FBG, we obtained a high strain measuring sensitivity of 0.817 μs/με. The sensor reveals the advantages of highly sensitive and easy demodulation, providing great potential for practical applications.
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