Raman amplifiers using the fibers as a gain medium is a encouraging technology for the optical dense wavelength division multiplexing (DWDM) communication systems. The noise figure mainly is a measure of how much the amplifier degrades the signal. The basic principles for SRS are as follows: If weak signal light and strong pump light are transmitted along a. A Raman amplifier is an optical amplifier based on Raman gain, which results from the effect of stimulated Raman scattering in some Raman gain medium. That medium is often an optical fiber (possibly a highly nonlinear fiber), although it can also be a bulk crystal, a waveguide in a photonic. In this paper, we present an experiment to reduce the quantum noise of a Raman amplifier by preparing the atomic medium in a correlated state with the Stokes light field. We report an observation of quantum noise reduction of more than 3. 5 dB in the atomic Raman amplification process.
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