基于多音输入实现实时可重构射频任意波形产生方法  

Real-time Reconfigurable Arbitrary Waveform Generation Based on Multi-tone Inputs

作　　者：周震 杨淑娜 杨波 池灏 ZHOU Zhen;YANG Shuna;YANG Bo;CHI Hao(School of Communication Engineering,Hangzhou Dianzi University,Hangzhou 310018,China)

机构地区：[1]杭州电子科技大学通信工程学院,杭州310018

出　　处：《光子学报》2025年第3期71-79,共9页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.62475064,62375071);浙江省自然科学基金(Nos.LY22F050010,LZ20F010003)。

摘　　要：提出并验证了一种基于双并行马赫曾德尔调制器和多音输入的射频任意波形产生方法。该方法采用双并行马赫曾德尔调制器取代时域脉冲整形系统中强度调制器对光载波进行载波抑制单边带调制,实现射频多音输入信号与输出脉冲的一一线性映射;通过调整多音信号的中心频率和功率值,可对采样点进行独立控制,从而实时重构并产生用户自定义的任意波形。相较于传统时域脉冲整形方案,该方法突破了波形对称性和电子任意波形产生器的限制,具有输出波形带宽大、种类多、重构能力强且成本低等优势。此外,搭建实验平台并实验验证了采样率高达20 GSa/s的任意波形产生,详细讨论了三阶色散对系统输出波形保真度的影响。Broadband Radio Frequency(RF)Arbitrary-waveform Generation(AWG)plays an important role in modern information systems,like high-speed optical communications,biomedical imaging,chemical coherence control,and advanced radar applications.Benefiting from a large bandwidth and compact configuration,the Time-domain Pulse Shaping(TPS)system provides possibilities for generating RF arbitrary waveforms based on the Fourier transform relationship between the input-output waveform pair.However,limited by the relatively low sampling rate and bit resolution of the Employed Electronic Arbitrary-waveform Generator(EAWG),the diversity and fidelity of the realized waveforms as well as its reconfiguration speed are constrained.To remove the EAWG′s limitation and realize dynamic real-time reconfiguration of RF waveforms,we propose and demonstrate a novel approach of RF arbitrary-waveform generation based on an improved TPS system with an integrated Dual Parallel Mach-Zehnder Modulator(DPMZM)and multi-tone inputs in this work.Different from the conventional TPS system,the proposed system is built using a mode-locked laser,a DPMZM,and a pair of conjugate dispersive mediums.One major difference lies in the employment of DPMZM,which can realize the Carrier-suppressed Single-sideband(CS-SSB)modulation mode to guarantee the one-to-one mapping from each frequency element to the output optical pulse.Another difference is the generation of the multi-tone RF inputs,which is provided by commercial sinusoidal signal generators instead of EAWG.Based on the Fourier transform relationship between the RF input signal and the output optical waveform,the spectrum of the applied multi-tone signals is linearly mapped into the temporal profile of the output optical signal,i.e.,a list of discrete optical pulses with adjustable amplitudes and time intervals are generated.The following Photodetector(PD)and Low-pass Filter(LPF)detect and smooth the temporal envelope of optical pulses to realize the RF waveform generation.Note that the output optical pulse

关 键 词：任意波形产生 微波光子学 时域脉冲整形 多音输入 频率-时间映射 

分 类 号：TN29[电子电信—物理电子学]