Design and optimization of novel two inputs optical logic gates (NOT, AND, OR and NOR) based on single commercial TW-SOA operating at 40 Gbit/s

摘要

This work demonstrates and optimizes novel simple design of two inputs all optical logic gates (NOT, AND, OR and NOR) using cross gain modulation technique at 40 Gbit/s. The proposed scheme differs from the previous conventional systems as utilizing only one commercial traveling wave-semiconductor optical amplifier (TW-SOA) and detuning optical band pass filter in order to select the appropriate output rather than using more than one SOA in addition to erbium-doped fiber amplifiers. This scheme overcomes the main problem appeared in the conventional schemes that suffer from the amplified spontaneous emission which considered as an additional noise that degrades output optical signal to noise ratio. Optimization process was done to achieve remarkable BER, Q-factor and acceptable extinction ratio at relatively low pumping powers while maintaining the simple design setup. A clear eye diagram for the all proposed optical logic gates is displayed. No obvious power penalty is observed for overall system.