All-optical time-domain chirp switches

Investigation of multi-bunching by generating multi-order fluorescence of NV center in diamond

Fabricating electronics from solid-state quantum emitters is a promising strategy for the miniaturization and integration of electronic devices. However, the practical realization of solid-state quantum devices and circuits for signal transmission and processing at room temperature has remained challenging. Herein, we investigated the multi-bunching phenomenon by generating multi-order fluorescence from a pseudo-thermal source at room temperature using the nitrogen-vacancy (NV) center in diamond. We demonstrate the shift in time of multi-bunching by controlling the effect of dressing to realize logical gates and transistor switching operations. We also suggest the optimization of the time propagation delay (TPD) of the gate circuit by changing the boxcar gate position.

Billiard-ball soliton interaction gates

We demonstrate a cascadable, Boolean complete, conservative-logic interaction gate that is based on elastic collisions between temporal solitons in optical fibers. The two identical-frequency and polarization inputs are initially separated by 4.5 pulse widths, and they interact in a 7.5 walk-off length of polarization-maintaining fiber. The group velocity of one of the inputs is altered by passing the pulse through a beam splitter with a wavelength-dependent reflection coefficient. Although details within the interaction region depend on the phase between the two inputs, after the pulses separate the result is phase independent. We find that each of two 17-pJ solitons is displaced after interaction by 3.5 pulse widths so as to increase the pulses' separation.

All-optical timing restoration using a hybrid time-domain chirp switch

We demonstrate a hybrid time-domain chirp switch (TDCS) in which the nonlinear chirper is an AlGaAs waveguide and the soliton dispersive delay line is a polarization-maintaining fiber. The hybrid TDCS can restore timing in a switching or transmission system, and when combined with an optical amplifier, it can act as an ultrafast, all-optical regenerator for soliton pulses. The timing restoration concept is applicable to other non-linear materials with negligible walk-off, and the acceptable time window can be tailored by adjusting the width and intensity of a reference pulse.