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国家自然科学基金(61120106001)

作品数:11 被引量:21H指数:4
相关作者:戴一堂徐坤刘建青丁卫民李建强更多>>
相关机构:北京邮电大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划国家高技术研究发展计划更多>>
相关领域:电子电信自动化与计算机技术机械工程更多>>

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11 条 记 录,以下是 1-10
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面向2G/3G/4G/WLAN融合接入应用的光载无线分布式天线系统被引量:1
2012年
文章认为满足2G/3G/4G/WLAN四网融合业务的多样性、多业务等级、高品质要求,需要建设能够实现宽带接入的光载无线分布式天线网络。为了实现低成本、高性能、多业务融合接入的光载无线(ROF)分布式天线网络,文章基于商用的千兆以太网光器件,设计了低成本、宽带的光收发模块;利用光损耗和受激布里渊散射(SBS)效应对链路传输性能的影响,基于激光器线宽展宽技术,抑制了受激布里渊散射效应;采用副载波复用技术,实现了点到点的多业务混合传输;采用粗波分复用技术,实现了点到多点的多业务分布式传输。
徐坤纪越峰戴一堂
关键词:四网融合光损耗副载波复用粗波分复用
Photonics-assisted compressive sampling system for wideband spectrum sensing
2017年
Compressive sampling (CS) has attracted considerable attention in microwave and radio frequency (RF) fields in recent years. It enables the acquisition of high-frequency signals at a rate much smaller than their Nyquist rates. Combined with photonics technology, traditional CS systems can significantly enlarge their operating bandwidth, which offers great potential for spectrum sensing in cognitive radios. In this Letter, we review our recent work on photonic CS systems for wideband spectrum sensing. First, a proof-of-concept photonics-assisted CS system is demonstrated; it is capable of acquiring numerous radar pulses in an instantaneous bandwidth spanning from 500 MHz to 5 GHz with a 500-MHz analog-to-digital converter (ADC). To further reduce the acquisition bandwidth, multi-channel photonics-assisted CS systems are proposed for the first time, enabling the acquisition of multi-tone signals with frequencies up to 5 GHz by using 120-MHz ADCs. In addition, the system bandwidth is increased from 5 to 20 GHz by employing time-interleaved optical sampling.
郭强陈明华梁云华陈宏伟杨四刚谢世钟
关键词:OPTOELECTRONICS
Improvement of phase coherence of optical pulse train based on fiber nonlinear effect被引量:1
2013年
A novel method to improve the phase coherence of optical pulse train with wavelength conversion based on cross-phase modulation and four-wave mixing effects in high nonlinear fiber is proposed.The method is experimentally demonstrated and the phase coherence of the pulse train from the mode-locked fiber laser is greatly improved.The improvement of the pulse quality is characterized in time and frequency domain.
GAO HongBiaoCHEN MingHuaCHEN HongWeiXIE ShiZhong
关键词:交叉相位调制高非线性光纤脉冲序列相干性四波混频效应波长转换
Broadband photonic radio frequency(RF) channelization based on coherent optical frequency combs and polarization I/Q demodulation被引量:5
2013年
In this work,we analyze and demonstrate a novel photonic-assisted broadband and high-resolution radio frequency(RF) channelization scheme based on dual coherent optical frequency combs(OFCs),regular optical de-muxes,and polarization I/Q demodulators in theory and experiment.The use of two coherent combs avoids precise optical alignment,and a numerical filter in digital signal processor(DSP) enables an ideal rectangular frequency response in each channel without any ultra-narrow optical filters.Besides,due to the use of polarization I/Q demodulation,ambiguous frequency estimate in direct detection can be avoided and the amplitude,phase mismatch in traditional I/Q demodulation can be mitigated.In experiment,we use two coherent OFCs with the free spectrum range(FSR) of about 40 GHz to demonstrate the channelization scheme with seven channels,500 MHz channel spacing and frequency coverage from 3.75 GHz to 7.25 GHz.The input RF tones are accurately down-converted to an intermediate frequency(IF) with a maximum frequency error of 110 kHz.Meanwhile,crosstalk and spurious free dynamic range(SFDR) of the scheme are also discussed.
DAI YiTangXU KunXIE XiaoJunYAN LiWANG RuiXinLIN JinTong
关键词:信道间隔
Using bidirectional modulation of 2-Ch phase modulator as basis for nonlinear distortion compensation in analog photonic links
2013年
We propose a third-order intermodulation distortion (IMD3) compensation scheme based on the bidirec- tional modulation of 2-Ch phase modulator (PM). We realize the destructive combination of IMD3 by using different modulation efficiencies and appropriately adjusting the input optical power ratio to satisfy a fixed relationship with modulation efficiency. The primary advantage of this scheme is that out-of-phase IMD3 is introduced using only one 2-Ch PM, thereby resulting in the cancellation of IMD3. Up to 27-dB suppression in IMD3 is experimentally demonstrated--a feature that will be useful in low-distortion analog or)tical transrni^sirm.
牛剑徐坤谢小军戴一堂李建强纪越峰林金桐
关键词:OPTICSPHYSICS
Microwave photonics: radio-over-fiber links, systems, and applications [Invited]被引量:5
2014年
Microwave photonics(MWPs)uses the strength of photonic techniques to generate,process,control,and distribute microwave signals,combining the advantages of microwaves and photonics.As one of the main topics of MWP,radio-over-fiber(RoF)links can provide features that are very difficult or even impossible to achieve with traditional technologies.Meanwhile,a considerable number of signal-processing subsystems have been carried out in the field of MWP as they are instrumental for the implementation of many functionalities.However,there are still several challenges in strengthening the performance of the technology to support systems and applications with more complex structures,multiple functionality,larger bandwidth,and larger processing capability.In this paper,we identify some of the notable challenges in MWP and review our recent work.Applications and future direction of research are also discussed.
Kun XuRuixin WangYitang DaiFeifei YinJianqiang LiYuefeng JiJintong Lin
关键词:FIBERMICROWAVEMICROWAVE
Photonic-assisted approach for instantaneous microwave frequency measurement with tunable range by using Mach-Zehnder interferometers被引量:5
2013年
A novel photonic-assisted approach to microwave frequency measurement is proposed and experimentally demonstrated. The proposed scheme is based on the frequency-to-power mapping with different transmis- sion responses. A polarizer is used in one output branch of a phase modulator to simultaneously implement phase modulation and intensity modulation. Owing to the complementary nature of the transmission re- sponses and the Mach-Zehnder interferometers (MZIs), this scheme theoretically provides high resolution and tunable measurement range. The measurement errors in the experimental results can be kept within 0.2 GHz over a freauencv ranee from 0.1 to 5.3 GHz.
王大鹏徐坤戴键吴钟乐纪越峰林金桐
Generation and noise analysis of a wide-band optical frequency comb based on recirculating frequency shifter
2014年
By optimizing the gain configuration and length of the loop, a 90-tone optical frequency comb (OFC) is successfully generated based on recirculating frequency shifter structure. The peak-to-peak power fluctuation of the 90-tone OFC is 4.26 dB and the tone-to-noise ratio is higher than 19.17 dB. To further analyze the noise accumulation feature of the tones when travelling around the loop, linewidth of the tones is measured by delayed self-heterodyne interferometer structure. The result shows the linewidth of the tones deteriorates little during the recirculating process, indicating that the generated OFC is an ideal multi-wavelength source for high-speed communication svstems.
于瀛雷诚陈明华陈宏伟杨四刚谢世钟
Effect of optical losses on the transmission performance of a radio-over-fiber distributed antenna system
2013年
The effects of optical losses oil a directly-modulated radio-over-fiber (RoF) system used for distributed antenna networks are determined. The results show that with a properly designed bidirectional amplifier, the RoF link can tolerate over 20 and 16 dB of optical losses for down- and up-links, respectively. Simulation results are also consistent with the experimental data. These findings can contribute to tile design of RoF distributed antenna systems with different topologies.
龚志山徐坤孟学军裴寅清孙小强戴一堂纪越峰林金桐
关键词:ROFOVERLINKWIFI
基于误差补偿的分布式喇曼温度传感器(英文)被引量:4
2014年
基于分布式喇曼传感器,对斯托克斯光和反斯托克斯光两路信号的同步问题进行了合理假设,并给出相应的补偿方法.为了进一步提高解调温度的准确度,采用温度解调系统及温度解调软件对实验系统收集到的数据进行分析.给出了实际开发分布式喇曼传感系统中补偿后离散式的温度解调算法,对该算法解调出来的温度进行实验测试.结果表明:解调温度的误差和监测点到光纤光注射端的距离及相应监测点待解调的温度值均有线性关系.该温度传感器空间分辨率达1m,对于整个2km的探测光纤,即使考虑到温控箱拥有0.5℃左右温度误差,整个实验系统的温度解调误差也在1℃左右.
刘建青尹飞飞李建强徐坤丁卫民戴一堂林金桐
关键词:误差补偿高准确度光波分复用
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