Yang C C
Opt Lett. 1991 Nov 1;16(21):1641-3. doi: 10.1364/ol.16.001641.
All-optical ultrafast AND, OR, and XOR logic functions that use asymmetric nonlinear directional couplers are numerically demonstrated. In such an asymmetric coupler, different Kerr effects are generated when the same power is launched into two waveguides. The output power tends to appear in the waveguide of stronger Kerr effect when only one waveguide is excited. When both waveguides are excited, the output power contrast between the two waveguides depends on the relative phase of the two input signals. The parameters of fiber couplers are used to demonstrate the logic functions.
利用非对称非线性定向耦合器的全光超快与、或和异或逻辑功能通过数值模拟得到了验证。在这种非对称耦合器中，当相同功率注入到两个波导中时会产生不同的克尔效应。当仅一个波导被激发时，输出功率倾向于出现在克尔效应较强的波导中。当两个波导都被激发时，两个波导之间的输出功率对比度取决于两个输入信号的相对相位。光纤耦合器的参数被用于验证逻辑功能。
