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对基于光纤四波混频(FWM)波长转换和色散的慢光实现进行了详细和系统的实验研究.首先,实验测定了高非线性光纤中FWM带宽约为40nm,从而确定了慢光的可调谐带宽;接着,在普通单模光纤和色散补偿光纤(DCF)中针对500MHz正弦信号和100ps短脉冲信号分别实现了3.4和1.98ns的脉冲延迟,在DCF中还实现了2.09ns的脉冲提前.讨论了增大延迟量的方法,指出随着宽带FWM波长转换的实现和大色散光纤的应用有望获得微秒量级的大延迟量,从而为高性能光纤延迟线和全光缓存器等应用提供支持.
A detailed and systematical experimental study on slow-light realization based on wavelength conversion and dispersion of optical fiber four-wave mixing (FWM) was carried out.Firstly, the FWM bandwidth of high-nonlinearity fiber was determined to be about 40 nm, Then, the pulse delays of 3.4 and 1.98 ns were achieved for 500 MHz sinusoidal signal and 100 ps short pulse signal respectively in normal single mode fiber and dispersion compensation fiber (DCF), and 2.09 ns pulse advance in DCF was also achieved. The method to increase the delay is discussed. It is pointed out that with the realization of broadband FWM wavelength conversion and the application of large dispersion fiber, it is expected to obtain a large amount of delay on the order of microseconds, which will provide applications such as high performance fiber delay line and all-optical buffer stand by.