Polarization-induced phase noise in Michelson interferometer with imperfect Faraday rotator mirrors was investigated.
This kind of noise generates from the rotation angle errors of Faraday rotator mirrors and external polarization
perturbation. The conversion factor κ, representing the magnitude conversion ability from polarization-noise to
polarization induced phase-noise, have been theoretically evaluated and experimentally investigated.
This paper describes a high-performance multiplexed vibration sensor system using fiber lasers. A serial vibration sensor
array consists of four short cavity fiber lasers. The system employs a single, polarization-insensitive, unbalanced
Michelson interferometer to translate individual laser wavelength shifts induced by vibration signals into interferometer
phase shifts. A dense wavelength division demultiplexor (DWDM) with high channel isolation is inserted to demultiplex
each laser signal as a wavelength filter. Finally, a digital phase demodulator based on the phase generated carrier
technique is used to achieve high-resolution interrogation. Experimental results show that no observable crosstalk is
measured on the output channels, and the minimal detectable acceleration of this system is ~200ng/&sqrt;Hz at 250Hz, which
is fundamentally limited by the frequency noise of the lasers.
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