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(a) A schematic diagram of optical logic gates based on FWM. (b)FWM output pattern observed in the far field for the case without feedback (state “V”) and with feedback (state “H”). (c) Double-lambda FWM energy level scheme.
Schematic of the experimental setup consisting of the cell, the pump and feedback beams, PBSs, half-wave plates ( ), optical isolator, fiber, fiber couplers (FCs), and inputs a and b, which are used for encoding the feedback beams “a” and “b.” Dv and Dh are detectors placed in the spots of beams “a” and “d.”
(a) Output power in the feedback-boosted state versus power of the two feedback beams “a” (red circles) and “b” (blue squares), where the error bars are the standard deviations. All error bars shown in the figures include both statistical and systematic errors. (b) Rise time of beam “d” in the feedback-boosted state versus power of the two feedback beams “a” (red circles) and “b” (blue squares). The rise time signals are averaged 1000 times and the systematic errors are approximately 20 ns.
Behavior of the logic devices. Plots (a) and (b) are the signals from inputs a and b, which encode the two feedback beams “a” and “b,” and plots (c) and (d) are the output signals from beam “d” in the feedback-boosted state and beam “a” in the feedback-suppressed state, which are detected by detectors Dh and Dv, respectively.
(a) Observed oscillation between the intensity of beam “a” (red solid) in the feedback-suppressed state and the intensity of beam “d” (blue solid) in the feedback-boosted state. (b) The oscillation frequency versus the square root of the pump power.
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