光纤参量放大增益谱边带快慢光特性研究

针对窄带光纤参量放大(FOPA),区别于以往增益谱的大增益斜率区域,研究了FOPA增益谱边带脉冲信号的快慢光特性.首先从理论上推导出了小信号增益条件下信号延时量的解析表达式;其次,在低抽运功率条件下(1 W),实验研究了10 Gb/s伪随机二进制序列脉冲信号在FOPA增益谱边带的延时特性,实验结果与理论计算基本符合;最后,通过分析研究抽运光功率、光纤色散及非线性系数等参数对信号延时量的影响规律,可以为FOPA增益谱边带的快慢光延迟线的设计提供参考.

Characteristics of the slow and fast light in the band-edge of gain spectrum of the fiber-optic parametric amplification

Compared to the large slope of the gain spectrum, in this paper, the characteristics of the slow and fast light on the band-edge of gain spectrum of the narrow-band fiber-optic parametric amplification (FOPA) are analyzed. Firstly, we derive the analytical solution of the signal delay under the condition of small-signal gain. Secondly, the characteristics of 10 Gb/s pseudo-random binary sequence pulse signal delay are investigated experimentally under the condition of low pump power (<1 W). Finally, the factors that influence the signal delay, such as pump power, dispersion, nonlinear coefficient, etc. are analyzed. The results obtained in this paper provide a detailed theoretical reference for designing slow and fast delay line in band-edge of gain spectrum of FOPA.