非线性光纤萨尼亚克结构的磁控特性

Magnetic Control Characteristics of Nonlinear Fiber Sagnac Structure

推导了磁光非线性光纤萨尼亚克结构的传输矩阵,可用于分析光纤的双折射、磁光效应和非线性相移,偏振控制器状态以及整个光纤环总损耗对萨尼亚克透射率的影响。实验研究了萨尼亚克结构磁光调制和非线性光控光开关功能。在0.0177T磁场作用下,磁光调制度可达17.05dB,理论分析与实验数据吻合。当时钟抽运控制信号的峰值功率为28.2dBm时,光控光开关消光比可达25.8dB,进一步施加磁场可使开关消光比提升0.7dB。光控光萨尼亚克结构的磁场响应在一定程度上可以借助偏振控制状态进行等效分析。

The transmission matrix of the magneto-optical（MO）nonlinear fiber Sagnac structure is deduced,which can be used to analyze the influences of fiber birefringence,MO effect,nonlinear phase shift,the polarization controller state and the total loss of the fiber loop on the transmittance of Sagnac.The MO modulation of Sagnac structure and functions of nonlinear optically-controlled-optical switch are experimentally investigated.The MO modulation degree can reach17.05 dB under the applied magnetic field of 0.0177 T,which is in good agreement with the theoretical analysis.When the peak power of the clock pump control signal is 28.2 dBm,the extinction ratio of optically-controlled-optical switch can reach25.8 dB.The extinction ratio of the switch can increase 0.7 dB by further applying the magnetic field.To some extent,the magnetic field response of the optically-controlled-optical Sagnac structure may be equally analyzed with the help of polarization control state.