All-optical OR and NOR gates using quantum-dot semiconductor optical amplifiers-assisted turbo-switched Mach-Zehnder interferometer and serially delayed interferometer at 1 Tb/s

The turbo-switch (TS) has proven to enhance the speed of the conventional semiconductor optical amplifier (SOA) up to four times better than the single SOA architecture. A novel performance of all-optical (AO) OR and NOT-OR (NOR) logic gates using TS Mach-Zehnder interferometer (TSMZI) combined with the ultrafast quantum-dot (QD) SOAs and followed by a serially delayed interferometer (DI) is numerically analyzed and investigated at 1 Tb/s. For comparison, the results have been obtained for AO OR and NOR Boolean functions using a DI after QDSOAs-based TSMZI, QDSOAs-based TSMZI, and QDSOAs-based conventional MZI. The achieved results indicate that placing a DI in series with the QDSOAs-TSMZI renders acceptable of OA OR and NOR operations at 1 Tb/s than QDSOAs-TSMZI and QDSOAs-MZI, where this achievement is not possible.