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Early Posting
摘要
A microwave-chip-based coherent multi-frequency RF driver is developed for a channel-interleaved photonic analog-to-digital converter (PADC) system, which comprises a multi-class optical demultiplexer and supports a sampling speed of 40 GSa/s. The generated signals from the RF driver are adjustable in both amplitude and phase. We analyze the relationship between the characteristics of generated RF driver signals and the demultiplexing performance in theory based on the OSDR. It is the most effective parameter to evaluate the performance of the demultiplexer in a PADC system without an EADC. By precisely adjusting the amplitude and phase of signals, the OSDR is optimized. The results verify the compatibility between the RF driver and the PADC system.
Chinese Optics Letters
2021, 19(8):
Early Posting
摘要
RF self-interference is a key issue for the application of in-band full-duplex communication in B5G and 6G communications. Compared with the electronic technology, the photonic technology has the advantages of wide bandwidth and high tuning precision, exhibiting the great potential to realize high interference cancellation depth over broad band. In this paper, a comprehensive overview of photonic enabled RF self-interference cancellation (SIC) is presented. The operation principle of photonic RF SIC is introduced and the advances in implementing photonic RF SIC according to the realization mechanism of phase reversal are summarized. For further realistic applications, the multipath RF SIC and the integrated photonic RF SIC are also surveyed. Finally, the challenges and opportunities of photonic RF SIC technology are discussed.
Chinese Optics Letters
2021, 19(11):
Early Posting
摘要
A broadband instantaneous multi-frequency measurement system based on chirped pulse compression, which potentially has sub-MHz accuracy and a hundred-GHz measurement range, is demonstrated. A signal-under-test (SUT) is converted into a carrier-suppressed double-sideband (CS-DSB) signal, which is then combined with an optical linearly frequency-modulated signal having the sweeping range covering the +1st-order sideband of the CS-DSB signal. By photodetection, low-pass filtering, and pulse compression, accurate frequencies of the SUT are obtained via locating the correlation peaks. In the experiment, single- and multi-frequency measurements with a measurement range from 3 to 18 GHz and a measurement accuracy of <±100 MHz are achieved.
Chinese Optics Letters
2021, 19(10):
Early Posting
摘要
An approach to generate high-speed and wideband frequency shift keying (FSK) signal based on carrier phase-shifted double sideband (CPS-DSB) modulation is proposed and experimentally validated. The core part of the scheme is a pair of cascaded polarization-sensitive LiNbO3 Mach-Zehnder Modulator and phase modulator, whose polarization directions of the principal axes are mutually orthogonal to each other. A proof-of-concept experiment is carried out, where a 0.5-Gb/s FSK signal with the carrier frequencies of 4/8 GHz and a 1-Gb/s FSK signal with the carrier frequencies of 8/16 GHz are generated successfully.
Chinese Optics Letters
2021, 19(10):
Microwave Photonics
摘要
We propose a photonics-assisted equivalent frequency sampling (EFS) method to analyze the instantaneous frequency of broadband linearly frequency modulated (LFM) microwave signals. The proposed EFS method is implemented by a photonic scanning receiver, which is operated with a frequency scanning rate slightly different from the repetition rate of the LFM signals. Compared with the broadband LFM signal analysis based on temporal sampling, the proposed method avoids the use of high-speed analog to digital converters, and the instantaneous frequency acquisition realized by frequency-to-time mapping is also simplified since real-time Fourier transformation is not required. Feasibility of the proposed method is verified through an experiment, in which frequency analysis of Kα-band LFM signals with a bandwidth up to 3 GHz is demonstrated with a moderate sampling rate of 100 MSa/s. The proposed method is highly demanded for analyzing the instantaneous frequency of broadband LFM signals used in radar and electronic warfare systems.
Chinese Optics Letters
2021, 19(1): 013901
光纤光学与光通信
梁斯靖  周次明  范典  李宇潇  [ ... ]庞彦东  陈希  
收起
摘要
针对目前光子晶体光纤传感器存在对模间干涉敏感、难以封装等问题,搭建了一种基于光载微波干涉的光子晶体光纤传感系统。系统干涉发生在光载波的微波包络之间,光不发生干涉,光波的偏振衰落、色散、模间干涉等对系统的信号质量影响很小,因此不需要对系统中光子晶体光纤进行特殊处理,且该系统对加工精度要求较低。分别对系统进行了应变与高温传感实验。应变实验结果表明:微波域干涉条纹可见度为20 dB,8 GHz处应变测量灵敏度为6.3 kHz/με,微应变测量分辨率可达1.59 με。温度实验结果表明:系统在室温到800 ℃温度范围内的温度测量灵敏度为76.04 kHz/℃,理论上温度测量分辨率可达0.13 ℃,通过多组长度探头的温度实验证明系统具有良好的温度灵敏度与稳定性。
激光与光电子学进展
2020, 57(5): 050602
“纪念激光器发明60周年”专题
李依丹  曹元  王旭东  张杰君  [ ... ]冯新焕  关柏鸥  
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摘要
提出并实现了一种基于色散调谐主动锁模光纤激光器技术的多普勒频移测量方法,该方法利用大色散谐振腔主动锁模激光器的输出波长与调制频率呈线性这一特性,通过测量锁模激光器输出波长来标定输入系统的微波频率,进而获得多普勒频移.通过模拟仿真,分析了激光器腔长、色散量以及锁模阶数等参量对系统频率测量特性的影响,在理论指导下,针对不同应用场景设计了分别基于长光纤及线性啁啾布拉格光纤光栅的大色散谐振腔结构,实现了载波中心频率分别为12.2 MHz、265 MHz、682 MHz和1.118 7 GHz情况下的频率偏移测量.所提出的测量方法具有结构简单、设计灵活的优点,在多普勒频移测量方面具有应用价值.
光子学报
2020, 49(11): 190
光纤光学与光通信
张昆  赵尚弘  王翔  李轩  [ ... ]林涛  王国栋  李赫  
收起
摘要
提出了一种基于扫频激光器的超宽带线性调频(LFM)信号产生和传输的方法。该方法使用扫频激光器产生频率随时间周期性变化的光信号,注入马赫-曾德尔调制器后产生载波抑制双边带光信号,利用嵌有光纤光栅(FBG)的Sagnac环完成双边带光信号的分离。Sagnac环的透射光信号经延时后与反射光信号拍频,从而产生了超宽带LFM信号。仿真分别产生了载频30 GHz、带宽16 GHz、时宽带宽积8000的超宽带连续波LFM信号和超宽带脉冲波LFM信号。所提方案解决了天线拉远场景中超宽带LFM信号经光纤传输时的功率周期性衰落问题。在多目标探测分析中,方案产生的信号表现出高精度临近目标分辨能力。所提方案具有载频、时宽、啁啾率和啁啾符号独立调谐的优点,可实现高载频、超宽带LFM信号的产生和功率周期性衰减抑制传输。
中国激光
2020, 47(6): 0606003
光束传输与控制
李赫  赵尚弘  于丽娜  林涛  [ ... ]张昆  王国栋  蒋炜  李轩  
收起
摘要
提出一种可实现相位调谐的微波光子上、下变频信号生成方案,其主要器件为偏振复用-双驱动马赫-曾德尔调制器(PDM-DMZM)。在所提方案中通过调节调制器直流偏置点实现上、下变频信号的切换,通过调节偏振控制器实现相位连续调谐,该方案可扩展为多通道独立相位调谐系统。仿真结果表明,频率为10GHz的射频信号可以分别转换为下变频信号(1GHz)和上变频信号(19GHz),其相位可在0°~360°范围内连续调谐,且不同相位下生成信号的功率最大波动在0.3dB以内,杂散信号抑制比可保持在20dB以上,系统的最大输入频率可调范围为0.5~65.0GHz,生成的移相信号频率可覆盖几GHz到130GHz。
中国激光
2020, 47(12): 1205004
张舟  王天亮  朱维  
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摘要
为了克服电混频器的瓶颈, 实现大带宽的信号混频, 提出了一种基于双偏振双平行马赫-曾德尔调制器的微波光子混频方案。通过调节调制器的6个直流偏置电压进行载波抑制单边带调制, 射频(RF)信号和本振(LO)信号分别注入调制器, 相互隔离, 各自调制, 且在2个相互正交的偏振态上传输, 最后经偏振控制器和检偏器调整到同一偏振态上进行拍频, 上、下变频模式的切换只需要改变其中一个直流偏置电压。仿真与实验表明: 该方案切实可行, 输入的RF频率在11~25 GHz时, 输出的上变频或下变频信号的RF杂散抑制比不低于25 dB, 频谱纯度高, 可调谐性好, 变频模式之间切换方便, 系统的RF/LO隔离度达到-49 dB。
光通信技术
2020, 44(2): 14
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