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All-optical logic gates can achieve a variety of logical operations directly in the optical domain , without going through the process of conversion of light - electricity - light , is an important new type of optical passive devices of the future all-optical network , which is widely used in addressing , demultiplexing , judgments , signal regeneration , label switching , data encoding , parity . Fast all-optical logic gate based on optical fiber nonlinear effects constitute the speed , power consumption, and high efficiency. Highly nonlinear fiber four-wave mixing , the new high-speed all-optical AND gate . According to the basic equations of the light pulse in a nonlinear optical fiber transmission and four-wave mixing principle , is derived and the theoretical models of all-optical AND gate . Walk-off effect through numerical simulation, of 40 Gbit / s all-optical AND gate , and the parameters of the signal wavelength , pump power , the initial pulse width of the output of the AND gate , which the group velocity mismatch the important factors to affect the output . Design experiments based highly nonlinear fiber four-wave mixing effect 20 Gbit / s all-optical AND gate , measuring the signal wavelength adjustment range . When high - power amplification of the input pulse , a cascade of four - wave mixing effect is observed , the AND gate output channels increases , the first level of the AND gate output significantly improved the quality of the signal wavelength tuning range widens . Highly nonlinear fiber cross-phase modulation effect , Nonlinear Optical Loop Mirror all-optical XOR gate new program . Departure from the principle of cross-phase modulation , and establish a description of the theoretical models of all-optical XOR gate . Numerical simulation of 40 Gbit / s all-optical XOR gate based on nonlinear optical loop mirror , the pump power , the signal wavelength , the XOR gate output of the pump pulse width , same group velocity mismatch walk-off effect will output light pulse impact .
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