理论分析了环形腔锁模光纤激光器中光谱边带不对称性产生的物理机制,实验中搭建了环形腔被动锁模光纤激光器平台,通过调节偏振控制器,在L波段获得了明显不对称的边带光谱。实验结果表明,光谱不对称性主要存在两方面的明显特点:1)强度不对称性,最明显时正二级的强度比负二级的强度高14.28 dBm ;2)数量不对称性,最明显时正级数量要比负级数量多5个。通过对光谱边带不对称性物理机制的分析对如何消除边带效应以获得理想的孤子脉冲具有重要的指导意义。

Physical mechanism of the sideband asymmetry is theoretically analyzed in the fiber ring lasers,A passive mode-locked erbium-doped fiber ring laser is constructed in the experiment,The obvious asymmetry of the spectral sidebands in an L-band is obtained by adjusting polarization controllers. The asymmetry of sidebands can be observed in two aspects:on the one hand,the asymmetry of the power between the positive and the negative order numbers is obvious,which can be observed that the intensity of the positive second order is higher 14.28 dBm than that of the negative same order;on the other hand,the sideband asymmetry numbers from the positive to the negative orders are also obvious,the number of the positive orders is more 5 numbers than that of the negative. The sideband asymmetry is useful for the research of eliminating the sidebands and acquiring the ideal soliton pulses and so on.