光学轨道角动量（OAM）模式多路复用通信技术已成为提升通信容量的前沿技术之一。然而，当前研究大多聚焦于模式信道的（解）复用，而忽略了信道路由这一关键环节。这一挑战的核心在于复用OAM模式在空间和时间域的重新分配，这是构建多功能模分通信网络的关键步骤。为填补这一研究空白，我们借助幺正变换的正交转换与衍射调制能力，提出了一种基于OAM模式时间演化的创新方法。该方法能够对OAM模式矢量进行高维度的正交变换，进而改变光束的传播方向和空间位置。通过运用菲涅尔衍射矩阵作为幺正算子，我们可以在传输过程中操控光束的空间位置，打破光束传播的不变性，实现时间演化。在实验演示中，我们成功在两个不同的时间序列内实现了四种OAM模式的深度路由。我们还实现了由四个复用OAM信道承载的4.69 Tbit/s正交相移键控（QPSK）信号的深度路由，平均衍射效率超过78.31%，误码率低于10-6。这些成果不仅彰显了我们路由策略的有效性，更预示着其在实际应用中的广阔前景。

Optical orbital angular momentum (OAM) mode multiplexing has emerged as a promising technique for boosting communication capacity. However, most existing studies have concentrated on channel (de)multiplexing, overlooking the critical aspect of channel routing. This challenge involves the reallocation of multiplexed OAM modes across both spatial and temporal domains—a vital step for developing versatile communication networks. To address this gap, we introduce a novel approach based on the time evolution of OAM modes, utilizing the orthogonal conversion and diffractive modulation capabilities of unitary transformations. This approach facilitates high-dimensional orthogonal transformations of OAM mode vectors, altering both the propagation direction and the spatial location. Using Fresnel diffraction matrices as unitary operators, it manipulates the spatial locations of light beams during transmission, breaking the propagation invariance and enabling temporal evolution. As a demonstration, we have experimentally implemented the deep routing of four OAM modes within two distinct time sequences. Achieving an average diffraction efficiency above 78.31%, we have successfully deep-routed 4.69 Tbit·s⁻¹ quadrature phase-shift keying (QPSK) signals carried by four multiplexed OAM channels, with a bit error rate below 10^–6. These results underscore the efficacy of our routing strategy and its promising prospects for practical applications.