Modulation Fading in Temporal Talbot Effect

作者：Xing, Junna; Wang, Chao; Chi, Hao^*; Yu, Xianbin; Zheng, Shilie; Jin, Xiaofeng; Zhang, Xianmin

来源：IEEE Photonics Technology Letters, 2018, 30(15): 1376-1379.

DOI：10.1109/LPT.2018.2848634

• Self-imaging effect
• temporal Talbot phenomenon
• modulation fading

Temporal Talbot phenomenon is the time-domain counterpart of the well-known spatial Talbot (self-imaging) phenomenon, which can be used to compress or expand input pulses or multiply the pulse repetition rate. It is of great interest to study the temporal Talbot effect with modulation due to its potential applications in information transmission, in which the envelope of the input pulse sequence is modulated by a signal. In this letter, we report the modulation fading phenomenon in the temporal Talbot effect, i.e., the phenomenon that the modulation depth degrades with the increase of the Talbot order, for the first time to our knowledge. A fully analytical expression of the modulation transfer function is presented to explain this phenomenon, which shows that the modulation fading relates to the pulse width, the repetition period of the pulse sequence, and the frequency of the modulating signal as well as the Talbot order. The theoretical results are then verified by simulations. Discussion on the method to mitigate the modulation fading is also presented.

• 出版日期2018-8-1
• 单位浙江大学