Study on All-Optical Logic Circuit of Semiconductor Optical Amplifier Based on Nonlinear Polarization Rotation Effect

In recent years, with the continuous progress of all optical signal processing technology, all optical networks have gradually developed towards high capacity, high speed, and high reliability. Semiconductor Optical Amplifier (SOA) has become a key instrument in all-optical signal processing technology because of its merits of easy integration, large nonlinearity and low power consumption. In order to improve the all-optical switching rate, the study proposes an all-optical logic circuit of the Semiconductor Optical Amplifier grounded on the nonlinear polarization rotation effect according to the correlation between the polarization principal state of the SOA and the Bonga sphere, and experimentally verifies the all-optical switching operation. The results show that when the control optical power is 20 mW, the 250-μW signaling optical power achieves a maximum NPR angle of 70°, which is increased by 21.4% and 28.6% compared with the maximum NPR angles of 55° and 50° for the 150-μW signaling optical power and 50-μW signaling optical power, respectively. The study of semiconductor optical amplifier all-optical logic circuits based on nonlinear polarization rotation effect has some reference value in all-optical information processing.