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Tunable optical comb generation based on carrier-suppressed intensity modulation and phase modulation

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Chinese Optics Letters 2010年第5期8卷 468-470页

作者：邹喜华潘炜 Center for Information Photonics and Communications Southwest Jiaotong University Microwave Photonics Research Laboratory University of OttawaON K1N 6N5Canada

An approach to generate a flat optical comb with tunable comb spacing and adjustable comb number is *** the proposed approach,a Mach-Zehnder modulator（MZM）,being biased to generate two carrier-suppressed first-order sidebands,is cascaded with a phase *** two optical sidebands are then sent to the phase modulator to generate two identical,but frequency-shifted phase-modulated *** to the complementary nature of the two adjacent comb lines in the phase-modulated spectra,the overlapping of the two spectra would lead to the generation of a flat optical *** only the phase modulation index or the microwave power is needed to be adjusted,the system is easy to be implemented with tunable comb spacing and adjustable comb *** simulations are performed,and the approach is verified by an experiment.

关键词： Computer simulation Phase modulation

Reconfigurable single-shot incoherent optical signal processing system for chirped microwave signal compression

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Science Bulletin 2017年第4期62卷 242-248页

作者： Ming Li Shuqian Sun Antonio Malacarne Sophie LaRochelle jianping yao Ninghua Zhu Jose Azana Institut National de la Recherche Scientifique-Energie Materiaux et Telecommunications(INRS-EMT)VarennesQuebec J3X 1S2Canada State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China University of Chinese Academy of Sciences Beijing 100049China TeCIP Institute Scuolo Superiore Sant'AnnaPisa 56124Italy Center for Optics Photonics and Laser(COPL)Universite LavalQuebec G1V OA6Canada Microwave Photonics Research Laboratory University of OttawaOntario K1N 6N5Canada

We propose and demonstrate a reconfigurable and single-shot incoherent optical signal processing system for chirped microwave signal compression, using a programmable optical filter and a multiwavelength laser(MWL). The system is implemented by temporally modulating a specially shaped MWL followed by a suitable linear dispersive medium. A microwave dispersion value up to 1.33 ns/GHz over several GHz bandwidth is achieved based on this approach. Here we demonstrate a singleshot compression for different linearly chirped microwave signals over several GHz bandwidth. In addition, the robustness of the proposed system when input RF signals are largely distorted is also discussed.

关键词： Fourier optics and signal processingAnalog optical signal processing Radio frequency photonics Pulse compression

4×4 multiple-input multiple-output coherent microwave photonic link with optical independent sideband and optical orthogonal modulation

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Chinese Optics Letters 2017年第1期15卷 33-39页

作者： Xiang Chen jianping yao Microwave Photonics Research Laboratory School of Electrical Engineering and Computer Science University of Ottawa Ottawa Ontario K1N 6N5 Canada

A 4× 4 multiple-input multiple-output coherent microwave photonic （MWP） link to transmit four wireless signals with an identical microwave center frequency over a single optical wavelength based on optical independent sideband （OISB） modulation and optical orthogonal modulation with an improved spectral efficiency is proposed and experimentally demonstrated. At the transmitter, the OISB modulation and optical orthogonal modulation are implemented to generate an OISB signal using a dual-parallel Mach-Zehnder modulator （DP- MZM） driven by four microwave orthogonal frequency-division multiplexing （OFDM） signals with an identical microwave center frequency. At the receiver, the OISB signal is coherently detected at a coherent receiver where a free-running local oscillator （LO） laser source is employed. Digital signal processing is then used to recover the four OFDM signals, to eliminate the phase noise from the transmitter laser source and the LO laser source, and to cancel the unstable wavelength difference between the wavelengths of the transmitter laser source and the LO laser source. Error-free transmission of three 16 quadrature amplitude modulation （16-QAM） 1 Gbps OFDM signals and one 16-QAM 1.5 Gbps OFDM signal at a microwave center frequency of 2.91 GHz over a 10 km single-mode fiber is experimentally demonstrated.

关键词： Fiber optics and optical communications Radio frequency photonics Heterodyne

Polarimetric parity-time symmetry in a photonic system

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Light(Science & Applications) 2020年第1期9卷 390-397页

作者： Lingzhi Li Yuan Cao Yanyan Zhi Jiejun Zhang Yuting Zou Xinhuan Feng Bai-Ou Guan jianping yao Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou 511442China Microwave Photonics Research Laboratory School of Electrical Engineering and Computer ScienceUniversity of OttawaOttawaON K1N 6N5Canada

Parity-time(PT)symmetry has attracted intensive research interest in recent *** symmetry is conventionally implemented between two spatially distributed subspaces with identical localized eigenfrequencies and complementary gain and loss *** implementation is *** this paper,we propose and demonstrate that PT symmetry can be implemented between two subspaces in a single spatial unit based on optical polarimetric *** controlling the polarization states of light in the single spatial unit,the localized eigenfrequencies,gain,loss,and coupling coefficients of two polarimetric loops can be tuned,leading to PT symmetry *** a demonstration,a fiber ring laser based on this concept supporting stable and single-mode lasing without using an ultranarrow bandpass filter is implemented.

关键词： polarization symmetry Polar

Exceptional-point-enhanced sensing in an all-fiber bending sensor

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Opto-Electronic Advances 2023年第12期6卷 36-43页

作者： Zheng Li Jingxu Chen Lingzhi Li Jiejun Zhang jianping yao Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou 510632China Microwave Photonics Research Laboratory School of Electrical Engineering and Computer ScienceUniversity of OttawaOttawaON K1N 6N5Canada

An exceptional-point(EP)enhanced fiber-optic bending sensor is *** sensor is implemented based on paritytime(PT)-symmetry using two coupled Fabry-Perot(FP)resonators consisting of three cascaded fiber Bragg gratings(FBGs)inscribed in an erbium-ytterbium co-doped fiber(EYDF).The EP is achieved by controlling the pumping power to manipulate the gain and loss of the gain and loss FP *** a bending force is applied to the gain FP resonator to make the operation of the system away from its EP,frequency splitting occurs,and the frequency spacing is a nonlinear function of the bending curvature,with an increased slope near the ***,by measuring the frequency spacing,the bending information is measured with increased *** achieve high-speed and high-resolution interrogation,the optical spectral response of the sensor is converted to the microwave domain by implementing a dual-passband microwave-photonic filter(MPF),with the spacing between the two passbands equal to that of the frequency *** proposed sensor is evaluated experimentally.A curvature sensing range from 0.28 to 2.74 m^(−1) is achieved with an accuracy of 7.56×10^(−4 )m^(−1 )and a sensitivity of 1.32 GHz/m^(−1),which is more than 4 times higher than those reported previously.

关键词： exceptional-point enhanced sensitivity bending sensor parity-time symmetry.

A special issue on Photonics Research in Canada

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Frontiers of Optoelectronics 2018年第2期11卷 105-106页

作者： jianping yao Lawrence R. CHEN School of Electrical Engineering and Computer Science University of Ottawa Ottawa ON KIN 6N5 Canada Department of Electrical and Computer Engineering McGill University Montreal QC H3A 0E9 Canada

Canada has a long standing history of contributions to the field of photonics. Photonics research occurs at a number of universities across the country as well as in government research labs. The Canadian photonics industry includes small start-ups to large scale corporations, many of which are involved in research. It is estimated that photonics is a $6 billion industry in Canada that employs more than 24000 people. Photonics clusters can be found in Vancouver, Toronto, Ottawa, Montreal, and Quebec City---cities that are also home to universities where world renowned photonics research takes place.

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Photonic Generation and Processing of Microwave Signals

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Photonic Generation and Processing of Microwave Signals

Investigation of insulation layer dynamic characteristics for high-speed railway

2020年全国微波毫米波会议

作者： jianping yao School of Electrical Engineering and Computer Science University of Ottawa

Microwave photonics is an field that deals with the use of photonic techniques to generate,process,control,and transmit microwave signals to take advantage of the high frequency,large bandwidth,and low loss offered by modern photonics for applications such as broadband wireless communications,radar,sensing,imaging and *** this talk,an introduction to microwave photonics will be presented,then techniques to generate and process of microwave signals based on photonics will be discussed,with an emphasis on the implementation based on photonic integrated *** in implementing the techniques and future research directions will also be discussed.

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cnki会议

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Research in Cold and Arid Regions 2015年第4期7卷 430-437页

作者： HongYe Yan GuoTang Zhao DeGou Cai QianLi Zhang jianping yao AiJun Cheng Railway Engineering Research Institute China Academy of Railway Sciences China Railway Corporation

Dynamic performance of insulation is one of the key parameters during the insulation application for high-speed railway subgrade. This paper conducted laboratory and field tests for the materials and dynamic load, especially for thermal performance, elastic deformation, and accumulated deformation of insulation materials. Experiment results show that mechanical properties of insulation layer structure are stable, which satisfies the requirements of the high speed railway.

关键词： high-speed railway insulation materials dynamic load elastic deformation accumulated deformation

Investigation of frost heave prevention using permeable subgrade structure

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Research in Cold and Arid Regions 2015年第5期7卷 611-618页

作者： DeGou Cai jianping yao HongYe Yan QianLi Zhang AiJun Cheng Jie Liu Railway Engineering Research Institute China Academy of Rails Science

This paper set up a series of comprehensive targets based on the concept of＇anti-freeze filler＇, which include reasonable water retention rate, frost heave characteristics, and compaction characteristics of filling material. Then, a type of permeable graded gravel is proposed, suitable for high-speed railway subgrade. A series of in-door water retention, permeability, and frost heave tests were performed under different graded conditions. Water retention, permeability, and frost heave characteristic of dif- ferent graded filling materials can be determined, in order to define the gradation range of permeable graded gravel. Relying on the frost-heave monitoring record of high speed railway in Northeast China, a series of experimental studies were per- formed, which included on-site filler production, compaction test, and the anti-frost effect test, in order to improve the pro- duction and compaction techniques of permeable graded gravel. From the research of this paper, the use of permeable graded gravel subgrade as the anti-frost structure for the high-speed railway subgrade in cold areas is feasible.

关键词： high-speed railway frost-heave prevention structure permeable filling material filling material production compaction control