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Optical phase-modulated systems are promising candidates for the development of ultrahigh-bit-rate transmission links, thanks to their high spectral efficiency and increased tolerance to fiber-optic nonlinearities. However, their implementation was considerably slowed down by theoretical studies, suggesting that the transmission performance can be severely hindered by nonlinear phase noise (the so-called...
Recent experiments with optical parametric oscillators have shown that an unpredicted extra noise on the phase of the fields reduces the level of squeezing or quantum correlations. In some cases, it can hinder the attempts to observe entanglement in those systems. It is probably the main reason why signal and idler entanglement above threshold remained unobserved by almost 20 years after its prediction...
In the nonlinear interaction of intense beams with a crystal inside an optical cavity, phonon scattering of the central carrier into sidebands acts as a source of extra phase noise for experiments in quantum optics.
Light noise spectroscopy is shown to be a sensitive tool for the detection of nonlinear magneto-optical resonances due to coherence in the ground state of alkaline atoms. Experiments with Rb and theoretical models are presented
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