Kerr Squeezing in Optical Fibers for Sensitivity Enhancement of Interferometers

We developed a new simple all-fiber setup for generation of polarization-squeezed states. The setup reliably generates −5 ± 0.5 dB of squeezing which is stable for a long time without any adjustments. We applied this polarization squeezed light to a polarization interferometer and demonstrated an increase of the signal-to-noise ratio by 4 ± 0.5 dB.