All-optical S-R flip-flop using dark-bright soliton conversion control

We propose a new design for all-optical S-R flip-flop using optical technique namely dark-bright soliton conversion control within an optical add-drop filter. In operation, all-optical data input logic `0', `1' is formed by dark soliton (D) and bright soliton (B) pulses, respectively. The conversion behaviour between dark and bright soliton pulses can be obtained and formed the logic pulses by a π/2 phase shifted device (i.e. an optical coupler), in which the binary logic operation can be formed simultaneously at the thought and drop ports, respectively. In all-optical S-R flip-flop application can be recognized as a simple and flexible system for forming the logic switching system. Numerical simulation results are obtained and confirmed for the useful application, in which the advanced logical system can be operated.