KEYWORDS: Logic, Logic devices, Signal processing, Modulation, Clocks, Four wave mixing, Optical signal processing, Semiconductor optical amplifiers, Photonics, Signal attenuation
To cope with the development of Carrier-suppressed-return-to-zero-on-off-keying (CSRZ-OOK) modulation format, it is
of great significance to investigate all-optical logic gates to process CSRZ-OOK format signals. To the best of our
knowledge, for CSRZ-OOK signals, only logic AND gate has been demonstrated while other logic functions haven't
been explored until now. In this paper, an all-optical logic unit to process CSRZ-OOK signals based on four-wave
mixing (FWM) arising in a semiconductor optical amplifier (SOA) is proposed. A logic OR gate and two logic AND
gates with the CSRZ-OOK format unchanged could be simultaneously achieved without reconfiguration in this single
unit. The performance of 40 Gb/s logic operation is firstly evaluated with numerical simulations by a comprehensive
dynamic model considering three-input induced FWM in an SOA. Then, experimental demonstrations at 10 Gb/s with
clear waveforms and high extinction ratios (ERs) further verify the logic integrity of this scheme.
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