We propose an optical parametric loop mirror whose reflectivity is adjustable by setting two tunable optical attenuators in Sagnac loop. The scheme of the optical parametric loop mirror is consisted of a nonlinear four wave mixing medium, a dispersive element, two optical attenuators, and a beam splitter. The generated four wave mixing wave can be totally separated from signal and pumps no matter how the beam splitter ratio is. When the beam splitter ratio is more than 0.5, we can separate the four wave mixing wave from pumps and signal completely by adjust the efficiency of the first attenuator, and when the beam splitter ratio is less than 0.5, we can also separate the four wave mixing wave from pumps and signal completely by adjust the efficiency of the second attenuator. Our research can help to generate and separate frequency degenerate twin beams in experiment.
We theoretically and experimentally demonstrate the influence of dispersion on the temporal mode properties of the spontaneous Raman scattering pumped by picosecond pulses in single mode optical fiber. We model the process of the ultrafast spontaneous Raman scattering, calculate and measure the intensity correlation function of the Raman photons with different dispersion by varying the detuning between pump and Raman photons or changing the optical length. The intensity correlation function decreases with the increase of dispersion induced temporal walk-off both by increasing the detuning and by increasing the fiber length. We evaluate the dispersion parameter of the single mode fiber by fitting the measured data with the theoretical equation we deduced. The estimated value is close to the labelled one. Our study provides a new way to evaluate dispersion parameters of the media in which Raman scattering can occur and is beneficial for efficient distillation of entanglement in optical fibers.
Stemming from the pursuit of a simple system to produce squeezed state for long distance continuous variable
quantum communication, we present an all-fibre source of pulsed twin beams at 1550 nm band by using a high
gain fiber optical parametric amplifier. The noise of intensity difference of the twin beams is below the shot noise
limit by 3.1 dB (10.4 dB after correction for losses).
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