The Quantum Dot Semiconductor Optical Amplifiers In Optical Information Processing Applications

With the development of optical communication, all-optical signal processing based on nonlinear effect of semiconductor optical amplifier(SOA) has an extensive applied perspectives. However, the gain and phase recovery of current SOAs is limited by the temporal response of carrier recovery, which limits the processing speed of current ultra-high speed all-optical signal processing. A novel SOA based on quanmtum dot, which has a significant faster carrier recovery, is emerged as the times requires.In this thesis, the applications of signal processing are presented, which based on four-wave mixing (FWM) of QD-SOAs and MZI with two QD-SOAs in each arm. The main contents are given as following:(1) Mathematical modeling of QD-SOA is set up and optimized by subsection modeling, Newton method and forth-order Runge-Kutta method. The gain saturation properties of QD-SOA are analyzed by regulating the input signal and carrier intensity.(2) The total output optical power of QD-SOA-MZI is mathematical deducted and novel optical power equalizer(OPE) and optical hard limiter(OHL) based on QD-SOA-MZI are introduced by adjusting working point. The performance of OPE and OHL is analyzed by adjusting the injecting current, electron relaxation time and input pulse width. A novel conversion of NRZ to RZ based on QD-SOA-MZI is realized and analyzed by changing the pulse width and power of input clock signal.(3) Mathematical modeling of QD-SOA's FWM is optimized. The FWM conversion efficiency is analyzed by adjusting frequency detuning, pump and probe signal powers. Optical sampling based on FWM of QD-SOA is realized when pump and probe signals are considered as sampling and sampled signals. The performance of optical sampling is analyzed by adjusting frequency detuning, pump and probe signal.