A measurement of carrier recovery time in semiconductor optical amplifiers (SOAs) based on dual pumps four-wave
mixing (FWM) is presented. The results show the carrier time is 91 ps, 79 ps and 63 ps at 120 mA, 180 mA and 240 mA,
respectively, which agree to our expectation. The experimental results show the conversion efficiency keeps constant
when the spacing of the two pumps varies within a small range.
A scheme for mitigating patterning effects in wavelength conversion by using a concatenated semiconductor optical
amplifier (SOA) and electroabsorption modulator (EAM) is proposed. The scheme is investigated theoretically and
experimentally. The bit error ratio and the power penalty of the converted output signal are estimated and compared with
the results of wavelength conversion based on cross gain modulation in a single SOA.
We propose and experimentally demonstrate a novel method for generating ultra-wideband (UWB) monocycle pulse by
exploiting a turbo-switch which consists of two reflective semiconductor optical amplifiers (RSOAs). By adjusting the
currents applied to both RSOAs, the monocycle pulse is realized due to the gain overshoot induced by the turbo-switch.
The polarity inversed monocycle pairs and the UWB doublet pulse train are numerically realized by cascading turboswitches.