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.
同时还指出，预群聚有在不增加电子束能量情况下缩短激光波长和降低对电子束质量要求等作用。
It is also indicated that prebunching can short the laser wavelength without increasing the electron beam energy and relieve the requirement on the electron beam quality.
光突发交换技术相对于光波长交换技术而言，具有信道资源利用率高、更适于传输分组业务等优点。
The optical burst switching technology has the advantage of higher efficiency of channel usage and more suitable for packet transfer comparing with the optical wavelength switching.
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