论文部分内容阅读
根据耦合波理论,在分析分布反馈(DFB)光纤激光器纵模特性的基础上,着重阐述其偏振特性。另外给出了偏振态同耦合系数和双偏振态相移量差的关系。理论分析结果表明,当分布反馈光纤激光器输出为0阶模时,输出激光的偏振状态由耦合系数和双偏振态的相移量差共同决定,即在耦合系数一定的情况下,通过增加双偏振态相移量的差,或在双偏振态相移量差一定的情况下,通过减小耦合系数,可以实现单偏振输出。实验中在经载氢处理的掺铒光纤上制作分布反馈光纤激光器,由于耦合系数较大和双折射效应过小,输出为双偏振态。
According to the coupling wave theory, the characteristics of longitudinal mode of distributed feedback (DFB) fiber laser are analyzed, and its polarization characteristics are emphatically explained. In addition, the relationship between the polarization state co-coupling coefficient and the double-polarization phase-shift difference is given. Theoretical analysis shows that when the output of the distributed feedback fiber laser is 0-order mode, the polarization state of the output laser is determined by the phase shift difference between the coupling coefficient and the dual polarization state. That is to say, when the coupling coefficient is constant, In the case of the difference of the amount of phase shift or the amount of phase shift of the double polarization, the single polarization output can be achieved by reducing the coupling coefficient. In the experiment, a distributed feedback fiber laser was fabricated on a hydrogen-treated erbium-doped fiber. Due to the large coupling coefficient and the birefringence effect, the output was double-polarized.