Compact picosecond nondegenerate four-wave mixing mirrorless optical parametric oscillator in silicon waveguide

The compact picosecond nondegenerate four-wave mixing mirrorless optical parametric oscillator based on multimode silicon waveguide is proposed and investigated numerically. Two counterpropagating picosecond pulses of fundamental mode can generate new pulses of second-order mode at different wavelengths due to the large modal dispersion between the fundamental mode and the second-order mode. The frequency of the newly generated waves can be tuned to 0.6 THz by adjusting the pump frequency difference of 5 THz. The output signal wave exhibits pulse width of 50 ps when the pump pulse is 100 ps. The proposed mirrorless optical parametric oscillator exhibits compact configuration and low threshold, which can find important applications in integrated optical source and ultrafast all-optical signal processing.