This paper proposes a novel scheme for all-optical decoder based on cross-gain modulation in semiconductor optical amplifiers is proposed.It has its own advantages

such as high efficiency

wide wavelength range

logical operations only related to input optical power

so no need for precise phase control and being insensitive to polarization.It analyzes its work principle and simulates by OptiSystem.Finally

it also analyzed the relationship between the input pump power and the probe optical power and its output power and output extinction ratio.