All-optical logic AND and OR gates generated by dark–bright soliton conversion

In this paper, a novel system of simultaneous optical logic AND and OR gates using dark–bright soliton conversion within the add/drop optical filter system is proposed. By using the dark–bright soliton conversion concept, the switching output signal response time of ns can be obtained. The input logic ‘0’ and control logic ‘0’ are formed by using the dark soliton pulse (D) trains. We found that the simultaneous optical logic AND and OR gates at the drop and through ports can be formed, respectively. The comparison data of the commercial system is also given, which is shown that the proposed system has the advantage over the commercial ones.