Performance Analysis of All Optical XOR Gate Using Quantum Dot Semiconductor Optical Amplifier-Based Mach-Zehnder Interferometer

摘要

Based on rate equations for carrier density in the active region of the QDSOA, the performance of a XOR gate using a quantum-dot semiconductor optical amplifier- based Mach-Zehnder interferometer (QDSOA-MZI) is analyzed in terms of Q factor through numerical simulations. The control pulse energy, the pulse width and the carrier capture time from the wetting layer into the dots are examined, which prove to be relevant to the Q factor. Our numerical yesults show that at 160Gb/s a high quality output signal with a Q factor over 5.9dB can be achieved.