全光数字光开关和光限幅器

All Optical Digital Switch and Optical Limiter

分析了级联单端输入非线性光波导耦合器的输出特性。理论分析表明这类器件具有极好的开关、限幅以及稳定光功率的特性。调整耦合器的耦合长度，可改变开关的阈值功率和限幅器的门限，且随着级联耦合器数目的增加，开关的动态开关区、消光比以及输出功率的起伏下降。数值分析表明，级联耦合器作为全光开关，消光比可小于－９０ｄＢ，动态开关区可小于３×１０－４Ｐｃ；作为光功率稳定器和光学限幅器，其输出光功率起伏可小于１０－７Ｐｃ。

Nonlinear digital optical switch, optical limiter and optical power stabilizator are proposed and analyzed, which consist of a number of cascaded single input excitation nonlinear dual core couplers. These devices utilize the nonlinear restrain effect of the nonlinear coherent coupler on the input power. As a example, four kinds of switch structures are discussed, numerical results show that the off/on extinction ratio can be less than -90 dB and the dynamic switching range can be less than 0.03 P c /100, and as an optical stabilizator, the fluctuation of the limiting power level can be less than 10 -7 P c .