Multiplexing below the frequency noise limit using digitally enhanced interferometry

Abstract

Digitally enhanced interferometry enables the simultaneous interrogation of multiple displacement sensors. We utilize this multiplexing technique to simultaneously measure three sections of an optical fiber with displacement resolutions of ~200 pm and low crosstalk between channels. We further improve the displacement sensitivity of our system at low frequencies by implementing a differential measurement between multiple sensors to suppress noise due to laser frequency fluctuations. Show more