Chapter 2 covers the distributed control problem of optical multicast in overlay multicast networks.
第二章主要集中于研究层叠组播网络中光组播的分布式控制问题。
参考来源 - 面向宽带IPTV业务的IP over optical层叠组播网络技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
本文讨论了光分组交换网络中的多种组播机制，包括并行模式，串行模式及混合模式全光组播机制。
Different multicasting schemes in optical packet switched networks are discussed, including the parallel mode, serial mode, and hybrid mode multicasting schemes.
未来，可以通过降低光网络组播树的粒度来降低光组播的使用门槛，这将有利于促进组播技术的更广泛使用。
In the future, multicast technologies can be promoted through lowering the threshold for multicast applications, that is, decreasing the granularity for an optical network multicast tree.
然而，光层组播由于光缓存、光分束和光波长变换等光器件的限制，呈现出和IP层组播不同的特点。
However, owing to some limitations on optical buffer, light splitter, and wavelength converter, optical multicast at optical layer offers different characteristics from those at IP layer.
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