Four-wave mixing

About: Four-wave mixing is a research topic. Over the lifetime, 7530 publications have been published within this topic receiving 112702 citations.

Passive mode locking by dissipative four-wave mixing

Abstract: A nonlinear fiber with a gain that has symmetric lateral frequency bands is found to generate a stable train of bright or dark pulses with a well-defined repetition rate. The pulse train is generated from noise; the pulses are unchirped, and their amplitude and repetition rate are determined by the parameters of the system. The underlying mechanism for this pulse formation is recognized as dissipative four-wave mixing in which only two frequencies are nonnegligible; one near the maximum gain transmits energy by wave mixing to its third harmonic, which is in the region of negative gain. An implicit analytical expression for the pulse train solution is derived. It is demonstrated that dissipative four-wave mixing can be employed to yield passive mode locking in a fiber ring laser consisting of only a filter and an active fiber. The resulting train of pulses is shown to have a high soliton content.

Nonlinear optical magnetometry with accessible in situ optical squeezing

Abstract: We demonstrate compact and accessible squeezed-light magnetometry using four-wave mixing in a single hot rubidium vapor cell. The strong intrinsic coherence of the four-wave mixing process results in nonlinear magneto-optical rotation (NMOR) on each mode of a two-mode relative-intensity squeezed state. This framework enables 4.7 dB of quantum noise reduction while the opposing polarization rotation signals of the probe and conjugate fields add to increase the total signal to noise ratio.

Strongly modified four-wave mixing in a coupled semiconductor quantum dot-metal nanoparticle system

Abstract: We study the four-wave mixing effect in a coupled semiconductor quantum dot-spherical metal nanoparticle structure. Depending on the values of the pump field intensity and frequency, we find that there is a critical distance that changes the form of the spectrum. Above this distance, the four-wave mixing spectrum shows an ordinary three-peaked form and the effect of controlling its magnitude by changing the interparticle distance can be obtained. Below this critical distance, the four-wave mixing spectrum becomes single-peaked; and as the interparticle distance decreases, the spectrum is strongly suppressed. The behavior of the system is explained using the effective Rabi frequency that creates plasmonic metaresonances in the hybrid structure. In addition, the behavior of the effective Rabi frequency is explained via an analytical solution of the density matrix equations.

Four-photon parametric mixing in optical fibers: effect of pump depletion

Abstract: The analytical solutions to differential equations governing nonlinear four-photon mixing in optical fibers are presented for the general case of depleted pump power. The expressions reduce to those derived earlier with the assumption of nondepleted pump power. We find that the maximum power available for conversion from the pump waves to the signal waves resulting from a third-order nonlinearity depends on the index mismatch and that the index mismatch required for achieving maximum possible power transfer is a function of the frequency shift.

Simultaneous wavelength conversion and optical phase conjugation of 200 Gb/s (5x40 Gb/s) WDM signal using a highly nonlinear fiber four-wave mixer

Abstract: A simultaneous wavelength conversion of 200 Gb/s (5×40 Gb/s) WDM signal over the entire gain band of an Er-doped fiber amplifier (EDFA) is demonstrated by a four-wave mixing in a dispersion arranged 750-m highly nonlinear dispersion-shifted fiber with a nonlinear coefficient of 20.4 W-1 km-1. Simultaneous optical phase conjugation is also demonstrated with successful dispersion compensation in a 200 Gb/s (5×40 Gb/s) WDM transmission through a 105 km conventional single-mode fiber.