Abstract
All-optical logic XNOR gate is realized by a series combination of XOR and INVERT gates. This Boolean function is realized by using Mach-Zehnder interferometers (MZIs) and exploiting the nonlinear effect of two-photon absorption (TPA) in semiconductor optical amplifiers (SOAs). The employed model takes into account the impact of amplified spontaneous emission (ASE), input pulse energy, pulsewidth, SOAs carrier lifetime, and linewidth enhancement factor (α-factor) on the gate’s output quality factor (Q-factor). The outcome of this study shows that the all-optical XNOR gate is indeed feasible with the proposed scheme at 250 Gb/s with both logical correctness and acceptable quality.
Highlights
The development of all-optical logic technology is important for a wide range of applications in all optical networks, including high speed all-optical packet routing and optical encryption [1]
Alloptical logic gates based on several different schemes have been demonstrated and reported, including that based on dual semiconductor optical amplifier (SOA) Mach-Zehnder interferometer (MZI) [2, 3], semiconductor laser amplifier loop mirror (SLALM) [4], ultrafast nonlinear interferometer (UNI) [5], four-wave mixing (FWM) process in semiconductor optical amplifiers (SOAs) [6], or cross-gain modulation (XGM) or cross-phase modulation (XPM) in nonlinear devices [7]
We propose to address this critical issue by exploiting two-photon absorption (TPA) in SOAs, which are placed in the two arms of MZI operated in probe-dual pump mode
Summary
The development of all-optical logic technology is important for a wide range of applications in all optical networks, including high speed all-optical packet routing and optical encryption [1]. I continue, extend, complete, and generalize the relevant previous work based on TPA [18,19,20,21,22] by investigating the high-speed performance of the all-optical logic XNOR gate with the help of numerical simulation conducted at a repetition rate of ∼250 Gb/s. Among these approaches, SOA is believed to be a key component for alloptical logic gates, because it has a stronger nonlinearity than optical fibers and it can be integrated more . The advantage of this model is the lower power consumption and higher power transmission than in [18,19,20,21,22]
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