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光纤中方波信号的慢光技术在全光通信和光纤传感等领域具有重要的应用前景.提出了谐波相对延时量的度量方法,分别采用速率方程和相干布居振荡理论,对掺铒光纤中方波信号的基波和高次谐波的快慢光特性进行了研究.在无抽运光输入情况下,改变入射光功率,入射探测光的基波最大相对延时量能达到20%,且存在实现最大相对延时量的入射光功率为8 mW;在有抽运光输入的情况下,改变信号光增益,入射探测光的基波相对超前量同样能达到-20%,且随着信号光增益的增大而增加.N次谐波(N=1,3,5,7,···)在频率f/N(f为基波信号最大延时量对应的调制频率)处有最大相对延时量,且它们的最大延时量相同,频率处于相干布居振荡引起的光谱烧孔带宽内.
The slow light technology of square wave signal in optical fiber has important application prospect in all optical communication and optical fiber sensing, etc. The measurement method of relative delay amount of harmonic wave is put forward. Using rate equation and coherent population oscillation theory, Erbium fiber in the fundamental and high harmonics of the square wave signal fast and slow light properties in the absence of pumping light input, changing the incident light power, the incident probe light of the maximum relative delay can reach 20 %, And the incident light power with the maximum relative delay amount exists is 8 mW. With the input of pumping light, the gain of the signal light is changed, and the relative leading amount of the incident probe light can also reach -20% Increases with the increase of signal light gain.N subharmonic (N = 1, 3, 5, 7, ···) at the frequency f / N (f is the modulation frequency corresponding to the maximum delay of the fundamental signal) There is a maximum relative delay, and their maximum delay is the same. The frequency is within the bandwidth of the spectral hole burning caused by coherent population oscillation.