组播业务的迅速增长对现有光网络的光路分配提出了更高的挑战.针对在大规模的光网络中,由于光组播路径中光信噪比过低导致传输层光链路无法正常工作,并由此带来“假性信令成功”的问题,提出了一种光信噪比受限的光组播路径分配机制.该机制充分利用光网络节点中光信噪比监测功能,在信令消息中携带光信噪比性能参量,并在光组播路径分配的信令过程中将光信噪比作为光波长分配的重要依据.通过该机制,控制平面在信令过程中充分考虑光信噪比因素,确保传输层的光组播路径得以顺利建立并正常工作.仿真结果表明,所提出的基于光信噪比感知的组播光路分配机制能够解决“假性信令成功”的问题,并有效降低光组播路径的阻塞率. The rapid growth of multicast services poses a higher challenge for the optical path allocation in the existing optical networks.For a large-scale optical network, because the optical signal-to-noise ratio of the optical multicast path is too low, the optical link of the transmission layer can not be normal Work and hence the problem of “false signaling success”, a optical multicast path allocation mechanism with limited optical signal-to-noise ratio is proposed. This mechanism makes full use of optical signal-to-noise ratio Function to carry the optical signal to noise ratio performance parameter in the signaling message and use the optical signal to noise ratio as the important basis for the optical wavelength distribution in the signaling process of the optical multicast path allocation.With this mechanism, Which takes full account of the optical signal to noise ratio to ensure that the optical multicast path in the transport layer can be successfully established and works normally.The simulation results show that the proposed multicast optical path allocation mechanism based on optical signal noise ratio perception can solve the problem of “ Make success ”and effectively reduce the blocking rate of the optical multicast path.