In line with the application requirements for the all-optical encryption of the single-wavelength signals in optical transmission systems

this paper makes a theoretical analysis of the all-optical encryption technology for the physical layer of the optical transmission system on the basis of the flow cryptosystems

designs an experimental scheme for SOA-XGM-based all-optical A logic gate and erects an experimental system in the laboratory.Moreover

it realizes the A logic processing at10Gbit/s

analyzes the effects of such main parameters as detected and pumped optical signal powers and SOA injected current on the quality of the output signals from the logic gate and implements the all-optical encryption of plain optical signals.