提出了一种基于光纤分数塔尔博特(Talbot)效应的光脉冲序列的倍频方法,介绍了Talbot效应的基本原理;应用自制的可调色散补偿器,将光纤锁模激光器产生的重复频率为10 GHz、脉宽约2.8 ps的窄脉冲序列倍频到重复频率为20,40和50 GHz的脉冲序列,也将重复频率5 GHz的窄脉冲序列经8倍频变换得到40 GHz的脉冲序列;通过分析窄脉冲序列的频谱,指出了实验中倍频得到的40 GHz和50 GHz脉冲质量下降的原因,提出了相应的优化措施。

The optical pulse trains with multiplied repetition frequency is generated by fractional Talbot effect in optical fiber. The principles of Talbot and fractional Talbot effects in fiber are analyzed. The 20,40 and 50 GHz optical pulse trains are obtained from the original pulse with 2.8 ps width at 10 GHz repetition frequency. An optical pulse at 40 GHz repetition frequency is also produced by upshifting the repetition frequency of 5 GHz pulse. The degradation of 40 GHz and 50 GHz pulse trains is discussed by spectrum analysis of pulse and some improvement methods are proposed.