基于偏振叠加和干涉两种方法的可控光脉冲延时器

可控的光信号延时在科研和通信领域有着广泛的应用.本文提出了两种可控光脉冲延时器的方案，分别基于偏振叠加和干涉原理.通过相位调制器的调制将光脉冲约束在一个环路中，需要时再释放，以达到光脉冲延时的目的.调节环路的长度和循环的次数便可以实现延时时间的可控.这两种方案均可以应用于全光纤光路中，通过集成光学技术可以实现微小尺寸的封装.基于偏振叠加的方案还可以方便地应用于自由空间光延时. 关键词： 光延时 可控 偏振 干涉

Two variable optical delay schemes based on polarization and interference

Variable optical delays have wide application in scientific research and optical communications.In this paper two different schemes to realize a variable optical delay are proposed,one based on polarization and the other on interference.A phase modulator is employed to restrict the signal pulse within an optical loop,and to release it when required.The delay time can be varied by adjusting the length of the loop and the number of cycles the pulse travels around it.Both types of delays are suitable for fiber systems,and can be made into a small package by means of integrated optics technology.The polarization scheme is also convenient for optical delays in free space.