Wun Jhih-Min, Wei Chia-Chien, Chen Jyehong, Goh Chee Seong, Set S Y, Shi Jin-Wei
Department of Electrical Engineering, National Central University, Jhongli, 320, Taiwan.
Opt Express. 2013 May 6;21(9):11475-81. doi: 10.1364/OE.21.011475.
A high-performance photonic sweeping-frequency (chirped) radio-frequency (RF) generator has been demonstrated. By use of a novel wavelength sweeping distributed-feedback (DFB) laser, which is operated based on the linewidth enhancement effect, a fixed wavelength narrow-linewidth DFB laser, and a wideband (dc to 50 GHz) photodiode module for the hetero-dyne beating RF signal generation, a very clear chirped RF waveform can be captured by a fast real-time scope. A very-high frequency sweeping rate (10.3 GHz/μs) with an ultra-wide RF frequency sweeping range (40 GHz) have been demonstrated. The high-repeatability (97%) in sweeping frequency has been verified by analyzing tens of repetitive chirped waveforms.
已经展示了一种高性能的光子扫频（啁啾）射频（RF）发生器。通过使用一种基于线宽增强效应工作的新型波长扫描分布反馈（DFB）激光器、一个固定波长窄线宽DFB激光器以及一个用于外差拍频RF信号产生的宽带（直流到50GHz）光电二极管模块，可以通过快速实时示波器捕获非常清晰的啁啾RF波形。已经展示了具有超宽RF频率扫描范围（约40GHz）的非常高的频率扫描速率（10.3GHz/μs）。通过分析数十个重复的啁啾波形，验证了扫描频率的高重复性（约97%）。
