Abstract
Recent progress of high-speed all-optical logic gates based on dual semiconductor optical amplifiers (SOAs) has been reviewed in this article. These schemes include using quantum-dot semiconductor ...
Highlights
All-optical signal processing is expected to be increasingly important in future ultrahigh capacity telecommunication networks (Hillerkuss et al, 2011)
This paper reviewed the current status in alloptical logic gates and summarized the previous findings from this research group
This paper reviewed recent progress in highspeed all-optical logic gates based on quantumdot semiconductor optical amplifier (QD-semiconductor optical amplifiers (SOAs))
Summary
All-optical signal processing is expected to be increasingly important in future ultrahigh capacity telecommunication networks (Hillerkuss et al, 2011). QD-SOAs have high saturated output power, low noise figure, fast carrier relaxation rate between QD energy states and a much smaller heating impact on gain and phase recovery times which makes them suitable for high-speed Boolean logic operations (Berg & Mork, 2004; Ma et al, 2010). Rate equation approach is discussed, which has been widely used to simulate the carrier dynamics on SOA systems assuming ultrafast dynamics These schemes provide promising methods for the realization of high-speed all-optical logic operation in future telecommunication systems. We use a QD-SOA-MZI to realize high speed all-optical XOR and AND operation The output of this scheme from the combination of two data streams is given by Equation (1), where G1(t) and G2(t) are the calculated total linear gain factors. Pulse energy increases, the carrier density of the active region of the device is depleted more; it takes longer to recover to the initial level
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