摘要
A novel ultrahigh-speed all-optical half subtracter based on four-wave mixing （FWM） in a single semiconductor optical amplifier （SOA） is proposed. This scheme only requires a single SOA and two input signals without additional light source, so it is quite simple and compact Due to the polarization-shift-keying （PolSK） modulated signals being used in this scheme, pattern-dependent degradation can be avoided. By numerical simulation, dependence of the critical factors of the logic gate performance, e.g., the output power of logic 1 and extinction ratio （ER）, on two input signals power is investigated. In addition, the effect of the gain polarization dependence of SOA is analysed.
A novel ultrahigh-speed all-optical half subtracter based on four-wave mixing （FWM） in a single semiconductor optical amplifier （SOA） is proposed. This scheme only requires a single SOA and two input signals without additional light source, so it is quite simple and compact Due to the polarization-shift-keying （PolSK） modulated signals being used in this scheme, pattern-dependent degradation can be avoided. By numerical simulation, dependence of the critical factors of the logic gate performance, e.g., the output power of logic 1 and extinction ratio （ER）, on two input signals power is investigated. In addition, the effect of the gain polarization dependence of SOA is analysed.
基金
Supported by the National Natural Science Foundation of China under Grant No 60707006, and the Nanjing University of Posts and Telecommunications Foundation under Grant No NY207142.
