Theoretical and simulation analyses of fiber optic extrinsic Fabry-Pérot interferometer (EFPI) based on a commercial collimator are studied. Fringe visibility and interference intensity are evaluated quantitatively under different cavity lengths, different tilt angles, and different mirror reflectivities. The analysis can be used to optimize the design of the EFPI.
The noise conversion relationships of relative intensity noise (RIN) and shot noise in a broadband source sensing system using a 3×3 coupler are studied. RIN and shot noise are converted into the phase noise floor through the arctangent demodulation scheme and the performances of the 3×3 coupler. To quantify the contribution of RIN and shot noise, we analyzed the equivalent phase noise induced by RIN and shot noise. The theory and experiment demonstrate that the equivalent phase noise of RIN is related to the correlation of three RINs and the initial phase, and the shot noise is related to the initial phase.
This paper proposes a fiber optic multi-parameter seismic observation system based on fiber optic interferometric sensors for seismic wave detection. The multi-parameter fiber optic seismic probe, including a 3-componet fiber optic seismometer a 4-componet strainmeter and a fiber optic temperature sensor, is developed using the fiber optic Michelson interferometers. The interrogator, using phase generating carrier technology, has a high resolution of 10-5 rad/Hz1/2. The probe is installed in a 60m deep borehole for long-term observation. The observation results show that all sensors can detect the seismic wave signals of the earthquakes, even teleseismic earthquakes from the coast of Taiwan. Moreover, the fiber optic strain sensors also can measure the earth tide. The fiber optic multi-parameter seismic observation system is expected to provide rich data for seismic wave detection in seismology and geophysics.
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