Abstract We propose a temporal Fresnel filtering based repetition rate multiplication (RRM) scheme suitable for multi-wavelength optical pulse trains. Residual chirp terms inside and outside the temporal Fresnel integral contribute to preserving of the multi-wavelength feature. Implementation of our scheme is very simple and compact, and only one linearly chirped Bragg fiber grating (LCBG) and one temporal grating (TG) are needed. Optical signals before and after the TG share the same LCBG by forward and backward passing to implement temporal original and inverse Fresnel transforms, respectively, avoiding possible mismatch between these two transforms and minimizing the influence of the third and higher order dispersion coefficients. Electrical programming of the TG contributes to the tunability of multiplication factor m. In numerical simulations, our scheme succeeds to preserve the multi-wavelength feature of an input pulse train, while the current temporal Fourier filtering and temporal Talbot effect based schemes fail, verifying the novelty of our scheme. Our work is especially useful for tuning the scanning resolution of steering angles of microwave beams, formed by photonic-assisted phased array antennas, in the application of five-generation (5G) wireless communications.

中文翻译：

---

一种用于多波长光脉冲串的可调重复率倍增器

摘要 我们提出了一种适用于多波长光脉冲序列的基于时间菲涅耳滤波的重复率倍增（RRM）方案。时间菲涅耳积分内部和外部的残余啁啾项有助于保留多波长特征。我们方案的实现非常简单和紧凑，只需要一个线性啁啾布拉格光纤光栅（LCBG）和一个时间光栅（TG）。TG前后的光信号共享同一个LCBG，通过前向和后向分别实现时间原菲涅耳变换和逆菲涅耳变换，避免了这两种变换之间可能的不匹配，并最大限度地减少了三阶和更高阶色散系数的影响。TG 的电气编程有助于倍增因子 m 的可调性。在数值模拟中，我们的方案成功地保留了输入脉冲序列的多波长特征，而当前基于时间傅立叶滤波和时间 Talbot 效应的方案失败，验证了我们方案的新颖性。我们的工作对于调整由光子辅助相控阵天线形成的微波波束转向角的扫描分辨率在五代 (5G) 无线通信的应用中特别有用。