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随着波分复用技术的迅速发展，下一代光传输网已初见雏形，而光层的保护与恢复机制的研究也被摆到了我们的面前。本文介绍了一些光层保护与恢复的机理。
With the rapid development of WDM technology, the next generation optical transport network has taken shape, and the research of optical layer protection and recovery mechanism has also been put before us. This article describes some mechanisms for optical layer protection and recovery.