Abstract
Interferometric devices have drawn a great interest in all-optical signal
processing for their high-speed photonic activity. Quantum-dot semiconductor
optical amplifier (QD-SOA)-based gate has added a new momentum in this field
to perform all-optical logic and algebraic operations. In this paper, a new
and alternative scheme for all-optical half adder using two QD-SOA-based Mach–Zehnder
interferometers is theoretically investigated and demonstrated. The proposed
scheme is driven by the pair of input data streams for one switch between
which the Boolean xor function
is to be executed to produce sum-bit. Then the output of the first switch
and one of the input data are utilized to drive the second switch to produce
carry-bit. The impact of the peak data power as well as of the QD-SOAs current
density, small signal gain, and QD-SOAs length on the ER and Q-factor of the
switching outcome are explored and assessed by means of numerical simulation.
The operation of the system is demonstrated with 160 Gbit/s.
© 2012 IEEE
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