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(a) Experimental setup. M, mirror; EDFA, erbium-doped fiber amplifier; FPC, fiber polarization controller; FPBS, fiber polarization beam splitter; DSF, dispersion shifted fiber; CWDM, coarse wavelength division multiplexer; VOA, variable optical attenuator; ESA, electronic spectrum analyzer. (b) The circuit of differential detection system. PD, photodiodes; LPF, low pass filter; A, ampere-meters.
(a) Noise level of the difference photocurrents for twin beams and corresponding SNL . (b) The noise reduction versus the seeded parametric gain g for different injection power . The temperature of DSF is 300 K and the FWHM of the pump is 0.9 nm.
(a) The noise level (j = s, i) of individual signal (solid filled points) and idler (hollow points) beams relative to SNL versus g for (diamonds), (squares), and (triangles). (b) The parametric gain g versus the pump power. The temperature of DSF is 300 K and the FWHM of the pump spectrum is 0.9 nm.
Spectra of the FOPA output for (a) and (b) . The FWHM of the pump is 0.5 nm.
(a) The ratio of the DC currents versus g. (b) The ratio of photon numbers between the amplified signal and generated idler beams versus g.
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