【摘要】 提出一种优化含有掺铒光纤放大器的非线性Sagnac干涉仪全光开关的新方法,建立了基于自相位调制和交叉相位调制两种解析模型,讨论了掺铒光纤放大器的小信号增益和饱和输出功率对开关性能的影响.分析表明掺铒光纤放大器的性能参量对开关所需要的Sagnac环中光子晶体光纤长度产生限制.当采用相同长度的光子晶体光纤时,基于交叉相位调制方式的全光开关与基于自相位调制方式的全光开关相比能够显著降低开关功率.采用分布傅里叶法数值求解非线性薛定谔方程,优化了开关结构,讨论了重复频率为40GHz脉宽为5ps的高斯型信号脉冲在开关时沿Sagnac环的传输特性.模拟结果表明,通过合理选择高非线性光子晶体光纤长度和掺铒光纤放大器的性能参量能够实现超低开关功率(<1mW)的开关操作.更多还原

【Abstract】 A new method for the optimization of all-optical EDFA-based Sagnac interferometer switch is presented.The effects of the small signal gain and the saturation output power of EDFA on the performance of the switch are investigated using an analytical model for all-optical switch based on self-phase or cross-phase modulation.There exists a critical value of the high nonlinear photonic crystal fiber(HNPCF)length for switching due to the limitation of the EDFA.When the HNPCF length required for switching is fixed,and the switching power of the XPM-based switch is much lower than that of the SPM-based switch.The propagating properties of the signal inside fiber loop when the device is switch on are investigated by numerically solving nonlinear Schr?dinger equations.The simulated results show that all-optical switch for 40GHz data with ultra-low switching power(<1mW)can be realized by properly selecting the HNPCF length and adjusting the performance of EDFA.更多还原