All-optical signal processing using semiconductor optical amplifier based logic gates

Some of all-optical signal processing techniques using all-optical logic gates based on semiconductor optical amplifiers have been demonstrated at 10 Gbps. The primary techniques for all-optical signal processing such as label swapping and data extraction are successfully demonstrated using VPI simulation tool lntroductlon As the speed of telecommunication systems increases and reaches the limit of electronic devices, the demands for all-optical signal processing techniques such as label or packet switching, decision making, regenerating, and basic or complex computing are rapidly increasing. Current communication systems usually require various ailoptical logic gates such as AND, OR, XOR, NAND, NOR, and XNOR. However, their applications are very limited to small numbers [ l , 21. Also, logic implementation techniques are usually limited to mach-zehnder interferometer and fiber-based devices while our logic gates are mostly based on semiconductor optical amplifiers (SOA?. ) In this paper, the primary techniques of all-optical label swapping and data extraction using semiconductor optical amplifiers are demonstrated at 10 Gbps using VPI simulation tool. Operation principles In this paper, to implement the all-optical label swapping and data extraction among various alloptical signal processing techniques, only one mechanism that is cross-gain modulation (XGM) of SOAs is used. To realize the all-optical label swapping, an all-optical XOR gate using two SOAs is utilized. Operation principle of the XOR gate is shown in Fig. 1 [3].