Abstract: In order to fully utilize the wavelength resources of the WDM (wavelength division multiplexing) optical networks, this paper proposes a multi-constrained multicast traffic grooming mechanism. According to a multi-constrained multicast light-tree establishing algorithm, this mechanism provides an effective solution to multicast traffic grooming in WDM optical networks under multi-constraints, including the number of optical transceivers, wavelength conversion capability and wavelength splitting capability. This paper evaluates the proposed traffic grooming mechanism based on the topology of the National Science Foundation Network of USA (NSFnet) and Pan-European Research and Education Network (GEANT). The simulation results show that the proposed mechanism can not only accomplish multicast traffic grooming effectively, but also gain a lower blocking proportion compared with the multi-hop traffic grooming mechanism.

Key words: optical networks, multicast routing, multi-constrained, light-tree, traffic grooming

摘要： 为了使WDM（wavelength division multiplexing）光网络中的波长资源利用率达到最大化，提出了一种多约束多播业务量疏导机制。该机制在考虑光收发器数约束、波长转换能力约束以及分光量约束等多约束的前提下，结合多约束光树建立算法，可以有效地完成WDM光网络中多播业务量疏导的任务。对美国国家自然科学基金网NSFnet和欧洲教育科研网GEANT的拓扑进行了仿真实现。性能分析表明，该疏导机制不仅能够有效完成多播业务量疏导工作，而且与多跳疏导机制相比，具有较低的阻塞率。

关键词: 光网络, 多播路由, 多约束, 光树, 业务量疏导