Journal
JOURNAL OF MODERN OPTICS
Volume 65, Issue 2, Pages 166-173Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09500340.2017.1382595
Keywords
two-photon absorption; optical logic; quantum-dot semiconductor optical amplifier
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We investigate all-optical logic operation in quantum-dot semiconductor optical amplifier (QD-SOA) based Mach-Zehnder interferometer considering the effects of two-photon absorption (TPA). TPA occurs during the propagation of sub-picosecond pulses in QD-SOA, which leads to a change in carrier recovery dynamics in quantum-dots. We utilize a rate equation model to take into account carrier refill through TPA and nonlinear dynamics including carrier heating and spectral hole burning in the QD-SOA. The simulation results show the TPA-induced pumping in the QD-SOA can reduce the pattern effect and increase the output quality of the all-optical logic operation. With TPA, this scheme is suitable for high-speed Boolean logic operation at 320Gb/s.
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