中文摘要：

从光时延线的原理、结构和性能等方面对全光时延线的实现方法进行了详述，并认为基于波长转换和光纤色散的全光可调时延线将在全光网络中具有重要作用；之后，对光时延线在OTDM、光学测量和光交换中的应用进行了介绍，最后总结了全光时延线需要改进的几个方面。

英文摘要：

Based on principles, structures and performances of optical delay line, realization methods of all-optical delay line are introduced on detail. All-optical tunable delay line based on wavelength conversion and optical fiber dispersion is thought as an important factor in all-optical network. Applications of optical delay line in optical time division multiplex （OTDM）, optical measurement and optical switching are introduced. The needed improvements of all-optical delay line are summarized finally.