Amplitude Squeezed States Of Light Research Articles

Analytical approach of reduction in bit error rate using amplitude-squeezed states of light

In optical communication, bit error rate (BER) is a real problem today. In communication with coherent light, there is a limitation in reduction in BER due to inherent statistical property of light. Noise level produced by amplitude-squeezed light is below the shot noise level which is called quantum limit of noise. So if the encoding is done by amplitude-squeezed states of light, then one can overcome the limitation significantly. In this paper, we have shown analytically that using amplitude-squeezed sates of light a massive reduction in BER is possible.

Simultaneous experimental generation of vacuum squeezing and bright amplitude squeezing from a frequency doubler

Both vacuum-squeezed and bright amplitude-squeezed states of light are experimentally generated from a frequency doubler with a semimonolithic Fabry-Perot configuration consisting of a type II nonlinear crystal and a concave mirror. Vacuum squeezing of 3.2 +/- 0.1 dB and amplitude squeezing of 1.3 +/- 0.2 dB are obtained simultaneously at a pump power of 8 mW. The two quadrature-squeezed optical fields that are generated are of identical frequency at 1080-nm wavelength and orthogonal polarization. Optimizing the input pump power by 19 mW yields as much as 5.0 +/- 0.2 dB of maximum vacuum squeezing. The advantages of the system are its simplicity and multiple utility.