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Observation of parity-time symmetry in time-division multiplexing pulsed optoelectronic oscillators within a single resonator

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Photonics Research 2022年第8期10卷 1915-1923页

作者： HAO DING QIZHUANG CEN KUN XU MING LI yitang dai State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China School of Electronic Electrical and Communication EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100190China Peng Cheng Laboratory Shenzhen 518052China

In recent years,parity-time(PT)symmetry in optoelectronic systems has been widely studied,due to its potential applications in lasers,sensors,topological networks,and other *** this paper,a time-division multiplexed pulsed optoelectronic oscillator(OEO)is proposed to study the dynamics of a PT symmetry *** microwave pulses are used to realize the PT symmetry in a single spatial resonator based on the temporal degrees of *** gain and loss of the microwave pulses and the coupling coefficient between them can then be *** first demonstrate the phase diagram from PT broken to PT symmetry in the OEO *** theoretically prove that the perturbation of a coupling-induced phase shift larger than(2π)×10^(-2)causes the disappearance of the PT *** this experiment,the perturbation is less than(2π)×0.5×10^(-2);thus,the phase transition of PT symmetry is *** addition,multipairs of PT-symmetry pulses indicate that pulsed OEO could be used to implement complex non-Hermitian Hamilton ***,it is confirmed that pulsed OEO is an excellent platform to explore the dynamics of PT symmetry and other non-Hermitian Hamiltonian systems.

关键词： optoelectronic resonator symmetry

Low-latency full-field temporal magnification based on spectral compression

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Photonics Research 2021年第12期9卷 2494-2500页

作者： XIANGZHI XIE JILONG LI FEIFEI YIN KUN XU yitang dai State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China Advanced Institute of Photonics Technology School of Information Engineeringand Guangdong Provincial Key Laboratory of Information Photonics TechnologyGuangdong University of TechnologyGuangzhou 510006China

Temporal magnification is an emerging technology for the observation of single-shot optical signals with irregular and ultrafast dynamics,which exceed the speed,precision,and record length of conventional *** temporal magnification schemes suffer from transmission delay and large volume of dispersive *** only the signal envelope can be magnified in the dispersion-based schemes,real-time full-field(phase and amplitude)measurement for a complex ultrafast optical signal remains an open ***,a bandwidth-compressed temporal magnification scheme for low-latency full-field measurements of ultrafast dynamics is *** the dispersion-based schemes,temporal magnification of a complex optical signal is achieved by bandwidth *** bandwidth is coherently compressed by the Vernier effect relying on the detuned free spectral range of a periodic optical filter and time ***,a temporal magnification factor of 224 is realized,and full-field measurements for picosecond pulses are *** proposal eliminates the dependence on dispersive elements and shows great potential in integration,which may pave a new path toward full-field measurement for nonrepetitive and statistically rare signals.

关键词： field spectral dispersion

A Detection-Switching-Assisted DCF Mechanism for Simulcast WLAN-over-Fiber Based Distributed Antenna Systems

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Chinese Journal of Electronics 2017年第4期26卷 837-841页

作者： FAN Yuting LI Jianqiang XU Kun dai yitang State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications

Distributed antenna systems(DASs) using Radio-over-fiber(Ro F) links is a promising candidate to provide flexible coverage and high data rates. For simulcast Wireless local-area network(WLAN) use in Ro F systems, the stations covered by different Remote antenna units(RAUs) contend for the wireless medium using Media access control(MAC) mechanism. Severe inter-RAU hidden nodes problem will happen due to the stations in different RAUs cannot detect each other very well. In order to alleviate this inter-RAU collision problem, a promising detection-switching-assisted Distributed coordination function(DCF) mechanism is presented using in the uplink. The control delay issues of the proposed mechanism are also discussed in this paper.

关键词： Radio-over-fiber(RoF) Distributed an tenna system IEEE 802.11.Detection-switch mechanism

Dual-Wavelength Linearization of Radio-over-Fiber Link for Broadband Access and Ubiquitous Sensing

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China Communications 2012年第1期9卷 20-24页

作者： Wu Zhongle Lv Qiang dai yitang Lin Jintong State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876P.R China

Radio-over-Fiber （RoF） technologies have been considered to be a promising solution to broadband access and ubiquitous sensing. We present a novel approach using dual-wavelength lights to suppress the nonlinear intermodulation distortion in intensity-modulated RoF link both theoretically and experimentally. The system we proposed rminly consists of two Laser Diodes （LDs） at different wavelengths, a commercial available Mach-Zehnder Modulator （MZM） and a Photo Detector （PD）. More than 25 dB suppression of the Third-order Interrnodulation Distortion （IMD3） is achieved by adjusting the wavelength and opti- cal power of the laser. Besides, the output of the MZM is then sent to the photodetector via a single fiber, which simplifies the system complexity for distrbution of RF signals over long distances.

关键词： RoF optical linearization IMD3 intensity modulator

Dissipative microwave photonic solitons in spontaneous frequency-hopping optoelectronic oscillators

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Photonics Research 2022年第5期10卷 1280-1289页

作者： TENGFEI HAO HAO DING WEI LI NINGHUA ZHU yitang dai MING LI State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China School of Electronic Electrical and Communication EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100190China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China Peng Cheng Laboratory Shenzhen 518052China

Dissipative solitons relying on the double balance between nonlinear and linear effects as well as cavity loss and gain have attracted increasing attention in recent years,since they give rise to novel operating states of various dissipative nonlinear *** optoelectronic oscillator(OEO)is a dissipative nonlinear microwave photonic system with a high quality factor that has been widely investigated for generating ultra-low noise single-frequency microwave ***,we report a novel operating state of an OEO related to dissipative solitons,i.e.,spontaneous frequency hopping related to the formation of dissipative microwave photonic *** this operating state,dissipative microwave photonic solitons occur due to the double balance between nonlinear gain saturation and linear filtering as well as cavity loss and gain in the OEO cavity,creating spontaneous frequencyhopping microwave *** generation of wideband tunable frequency-hopping microwave signals with a fast frequency-hopping speed up to tens of nanoseconds is observed in the experiment,together with the corresponding soliton *** work reveals a novel mechanism between the interaction of nonlinear and linear effects in an OEO cavity,extends the suitability and potential applications of solitons,and paves the way for a new class of soliton microwave photonic systems for the generation,processing,and control of microwave and RF signals.

关键词： microwave solitons dissipative

Optoelectronic parametric oscillator

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Light(Science & Applications) 2020年第1期9卷 1028-1037页

作者： Tengfei Hao Qizhuang Cen Shanhong Guan Wei Li yitang dai Ninghua Zhu Ming Li State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China School of Electronic Electrical and Communication EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China

Oscillators are one of the key elements in various applications as a signal source to generate periodic *** them,an optical parametric oscillator(OPO)is a driven harmonic oscillator based on parametric frequency conversion in an optical cavity,which has been widely investigated as a coherent light source with an extremely wide wavelength tuning ***,steady oscillation in an OPO is confined by the cavity delay,which leads to difficulty in frequency tuning,and the frequency tuning is discrete with the minimum tuning step determined by the cavity ***,we propose and demonstrate a counterpart of an OPO in the optoelectronic domain,i.e.,an optoelectronic parametric oscillator(OEPO)based on parametric frequency conversion in an optoelectronic cavity to generate microwave *** to the unique energy-transition process in the optoelectronic cavity,the phase evolution in the OEPO is not linear,leading to steady single-mode oscillation or multimode oscillation that is not bounded by the cavity ***,the multimode oscillation in the OEPO is stable and easy to realize owing to the phase control of the parametric frequency-conversion process in the optoelectronic cavity,while stable multimode oscillation is difficult to achieve in conventional oscillators such as an optoelectronic oscillator(OEO)or an OPO due to the mode-hopping and mode-competition *** proposed OEPO has great potential in applications such as microwave signal generation,oscillator-based computation,and radio-frequency phase-stable transfer.

关键词： effect oscillator parametric

Broadband photonic radio frequency(RF) channelization based on coherent optical frequency combs and polarization I/Q demodulation

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Science China Technological Sciences 2013年第3期56卷 621-628页

作者： dai yitang XU Kun XIE XiaoJun YAN Li WANG RuiXin LIN JinTong Beijing University of Posts and Telecommunications State Key Laboratory of Information Photonics and Optical CommunicationsP.O.Box 55(BUPT)

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 *** 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 ***,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 *** 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 *** input RF tones are accurately down-converted to an intermediate frequency(IF) with a maximum frequency error of 110 ***,crosstalk and spurious free dynamic range(SFDR) of the scheme are also discussed.

关键词： optical frequency comb polarization I/Q demodulation microwave photonic radio frequency(RF) signal processing

Microwave photonics: radio-over-fiber links, systems, and applications [Invited]

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Photonics Research 2014年第4期2卷 54-63页

作者： Kun Xu Ruixin Wang yitang dai Feifei Yin Jianqiang Li Yuefeng Ji Jintong Lin State Key Laboratory of Information Photonics&Optical Communications(Beijing University of Posts and Telecommunications) P.O.Box 55(BUPT)Beijing 100876China

Microwave photonics(MWPs)uses the strength of photonic techniques to generate,process,control,and distribute microwave signals,combining the advantages of microwaves and *** 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 ***,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 ***,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 *** this paper,we identify some of the notable challenges in MWP and review our recent *** and future direction of research are also discussed.

关键词： fiber Microwave microwave

Recent advances in optoelectronic oscillators

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Advanced Photonics 2020年第4期2卷 4-23页

作者： Tengfei Hao Yanzhong Liu Jian Tang Qizhuang Cen Wei Li Ninghua Zhu yitang dai JoséCapmany Jianping Yao Ming Li Chinese Academy of Sciences Institute of SemiconductorsState Key Laboratory on Integrated OptoelectronicsBeijingChina University of Chinese Academy of Sciences School of ElectronicElectricaland Communication EngineeringBeijingChina University of Chinese Academy of Sciences Center of Materials Science and Optoelectronics EngineeringBeijingChina Beijing University of Posts and Telecommunications State Key Laboratory of Information Photonics and Optical CommunicationsBeijingChina Universitat Politécnica de Valencia ITEAM Research InstitutePhotonics Research LabsValenciaSpain University of Ottawa Microwave Photonics Research LaboratoryOttawaOntarioCanada

An optoelectronic oscillator(OEO)is a microwave photonic system that produces microwave signals with ultralow phase noise using a high-quality-factor optical energy storage *** type of oscillator is desired in various practical applications,such as communication links,signal processing,radar,metrology,radio astronomy,and reference clock ***,new mode control and selection methods based on Fourier domain mode-locking and parity-time symmetry have been proposed and experimentally demonstrated in OEOs,which overcomes the long-existing mode building time and mode selection problems in a traditional *** to these mode control and selection methods,continuously chirped microwave waveforms can be generated directly from the OEO cavity and single-mode operation can be achieved without the need of ultranarrowband filters,which are not possible in a traditional *** OEOs with a compact size and low power consumption have also been demonstrated,which are key steps toward a new generation of compact and versatile OEOs for demanding *** review recent progress in the field of OEOs,with particular attention to new mode control and selection methods,as well as chip-scale integration of OEOs.

关键词： optoelectronic oscillator microwave photonics Fourier domain mode-locking parity-time symmetry photonics integrated circuits