基于光纤四波混频波长转换和色散的慢光实验研究

Experimental study of slow light based on four-wave mixing wavelength conversion and dispersion in optical fibers

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.

Slow light based on four-wave mixing （FWM） wavelength conversion and dispersion is experimentally studied. The FWM bandwidth of the highly nonlinear fiber is measured to be 40 nm,which is also the slow light tunable bandwidth. A 3. 4 ns delay of 500 MHz sine signal is achieved in standard single mode fiber,and 1. 98 ns delay of short pulses with 100 ps width is achieved in dispersion compensation fiber （DCF）. An advancement of 2. 09 ns for the 100 ps short pulses is also achieved in the DCF. The method to increase the slow light delay is discussed,and large delay up to microseconds is expected when wideband FWM wavelength conversion and large dispersion fibers are used. The expected large delay will help us realize high efficiency fiber delay lines and all-fiber buffers.