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Doppler radar by using single multicarrier pulse based on optical fibre delay lines

Journal of Systems Engineering and Electronics 2010年第3期21卷 404-407页

作者： Junqi Duan Zishu He National Information Control Laboratory Chengdu 610036 P. R. China Department of Electronic Engineering University of Electronic Science and Technology of China Chengdu 610054 P. R. China

The proposed Doppler measurement technique shows that the Doppler measurements can be accomplished by a single pulse with multiple frequency components through optical fibre delay *** and velocity ambiguity can be removed,and the velocity resolution can be improved dramatically by using long optical fibre delay ***,the velocity resolution can be modified by adjusting the length of optical fibre delay *** addition,the proposed radar can achieve high range resolution by using a single wideband *** a result,the new approach can improve radar performance significantly.

关键词： Doppler radar matched filters optical delay lines radar signal processing radar system velocity measurement.

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Tunable hexagonal boron nitride topological optical delay line in the visible region

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Chinese Optics Letters 2024年第5期22卷 124-130页

作者：费宏明武敏林瀚杨毅彪肖连团 College of Physics Taiyuan University of TechnologyTaiyuan 030024China College of Information Engineering Shanxi Vocational University of Engineering Science and TechnologyJinzhong 030619China College of Science RMIT UniversityMelbourneVictoria 3000Australia College of Electronic Information and optical Engineering Taiyuan University of TechnologyTaiyuan 030024China

Tunability,ultracompact design,high group index,low loss,and broad bandwidth are desired properties for integrated optical delay lines(ODLs).However,those properties are challenging to achieve simultaneously in the visible *** paper proposes a tunable hexagonal boron nitride topological optical delay line(ODL)in the visible region based on valley photonic *** topological edge state from the beard-type boundary allows the achievement of an ultralow group velocity close to zero,which results in a large group index of 629 at 645 ***,we demonstrate tuning of the slow-light wavelength and optical delay times with electrically tunable liquid crystals by applying external *** device has an ultracompact size of 5μm×2.7μm with an optical delay distance of 25a(a is the lattice constant)and a delay time of 12 *** design can provide a new possibility for designing ODLs working in the visible region for optical communication and quantum computing systems.

关键词： valley photonic crystal topological edge states optical delay lines

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Subwavelength grating devices in silicon photonics

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Science Bulletin 2016年第11期61卷 879-888页

作者： Junjia Wang Ivan Glesk Lawrence R.Chen Department of Electrical and Computer Engineering Mc Gill University Department of Electronic and Electrical Engineering University of Strathclyde

Subwavelength grating(SWG) waveguides in silicon-on-insulator are emerging as an enabling technology for implementing compact, high-performance photonic integrated devices and circuits for signal processing and sensing applications. We provide an overview of our recent work on developing wavelength selective SWG waveguide filters based on Bragg gratings and ring resonators, as well as optical delay lines. These components increase the SWG waveguide component toolbox and can be used to realize more complex photonic integrated circuits with enhanced or new functionality.

关键词： Subwavelength gratings Siliconphotonics Integrated optics - Bragg gratings Ringresonators optical delay lines

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