Ultra-high-speed all-optical multivalued inverter using nonlinear polarization rotation in semiconductor optical amplifier

In this communication, we have introduced a new thought of designing all-optical binary and multivalued inverters using a single semiconductor optical amplifier (SOA) at a speed more than 300Gbps. The operation of this inverter is based on the nonlinear polarization rotation (NPR) effect in SOA. The quality factor (Q ~ 38.3 dB for binary, 46.6 dB for ternary and 41.5 dB for quaternary inverter), extinction ratio (ER ~ 43 dB for binary, 40 dB for ternary and 39 dB for quaternary inverter), contrast ratio (CR ~ 46.5 dB for binary, 46.5 dB for ternary and 45 dB for quaternary inverter), and relative eye penning (REO ~ 96% for binary inverter, 92% for ternary inverter, and 87% for quaternary inverter) have been calculated. The single-SOA inverter can solve the operational delay and noise-related problem of a design by reducing the hardware complexity. The circuit shows some useful values of Q factor (> 10 dB) and other performance-related matrices even in an ultra-high speed (100Gbps or more).