Ultra-Wideband Pulse Train Generation Based on Turbo-Switch Structures

A simple configuration is proposed and experimentally demonstrated to generate ultra-wideband (UWB) monocycle pulses based on a turbo-switch structure which consists of two reflective semiconductor optical amplifiers (RSOAs). The first RSOA generates an inversed pulse train of the injected signal through the cross-gain modulation, while the second RSOA introduces an overshoot. The overshoot can be enhanced by properly adjusting the currents applied to both of the two RSOAs, therefore, the UWB monocycle pulse train is successfully obtained. By cascading turbo-switches, the polarity-inversed UWB monocycle pairs and the UWB doublet pulse train are numerically realized.