, Volume 12, Issue 3, pp 481-489  Design of ultrafast all-
optical 4-bit parity generator and checker using quantum-dot
semiconductor optical amplifier-based Mach-Zehnder
interferometer  Purchase on Springer.com  $39.95 / €34.95 /
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feasibility of implementing all-optically an ultrafast 4-bit
parity generator and checker using the quantum-dot semiconductor
optical amplifier (QD-SOA)-based Mach-Zehnder Interferometer
(MZI) as XOR gate is theoretically investigated and
demonstrated. The proposed circuit exploits an architecture
where four XOR gates are concatenated in a modular manner. The
first XOR gate drives the control input of the second one whose
other control port receives the current bit of the word that
undergoes parity processing. This interconnection is repeated up
to the fourth XOR gate, on which an extra bit is applied.
Depending on the binary value of this bit, the same circuit c