We propose a spatial mode compensation method using progressive phase conjugation (PPC) to establish a dynamic control technology for mode distribution in multi-mode fiber (MMF). PPC is a phase conjugate generation technology that can be far away from the signal source and does not require an additional reference beam. We confirm the basic operation of the proposed scheme by considering the coupling efficiency between the compensated spatial mode component and incident mode. We quantitatively evaluate the mode recovery from the mixed state of LP11, LP22, LP02, and LP31 to LP01, the fundamental mode. Using a random optical diffuser to uniformly scatter the intensity distribution of the signal beam, high compensation performance can be obtained because the influence of the mode intensity distribution is reduced.

我们提出了一种使用渐进相位共轭（PPC）的空间模式补偿方法，以建立多模光纤（MMF）中模式分布的动态控制技术。PPC是一种相位共轭生成技术，可以远离信号源，不需要额外的参考光束。我们通过考虑补偿空间模式分量和入射模式之间的耦合效率来确认所提出方案的基本操作。我们定量评估从 LP11、LP22、LP02 和 LP31 的混合状态到基本模式 LP01 的模式恢复。使用随机光扩散器对信号光束的强度分布进行均匀散射，由于减少了模式强度分布的影响，可以获得较高的补偿性能。