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.
We demonstrate two all-optical methods for UWB pulse generation based on various nonlinearities of the semiconductor
optical amplifier (SOA), namely, self phase modulation (SPM), and cross gain modulation (XGM). In the first method,
we present UWB doublet generation based on SPM. The monocycle pulse is generated from dark return-to-zero (RZ)
signal, and then converted to doublet pulse by injecting an additional probe signal with the SMF transmission. For the
first time to best of our knowledge, we report that the generated doublet pulses are transmitted over 5km SMF by proper
dispersion compensation without distortion. Second, we present UWB doublet generation by XGM of two cascaded
SOAs. The configuration of our all-optical methods is compact and simple.
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.
A numerical model for the investigation of ultrafast gain and phase dynamics in InGaAsP bulk semiconductor optical
amplifiers for transient cross phase modulation is presented in considering non-equilibrium carrier distribution and
carrier temperature dynamics for different probe wavelengths. Results indicate that the nonlinear patterning of transient
cross phase modulation can be effectively suppressed by an assist light, especially for the up-conversion and the assist
light in counter-propagating scheme.
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