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Perfect Optical Nonreciprocity with Mechanical Driving in a Three-Mode Optomechanical System

Communications in Theoretical Physics 2019年第8期71卷 1011-1016页

作者： Li-Hua Zhao Xian-Li Li He-Lin Lu Xue-Dong Tian College of Electronic science Northeast Petroleum University Daqing 163318 China Department of Physics Yunnan Minzu University Kunming 650500 China College of Physics science and Technology Guangxi Normal University Guilin 541004 China

Nonreciprocal devices are indispensable for building quantum networks and ubiquitous in modern communication ***, we study perfect optical nonreciprocity in a three-mode optomechanical system with mechanical *** scheme relies on the interference between optomechanical interaction and mechanical *** find perfect optical nonreciprocity can be achieved even though nonreciprocal phase difference is zero if we drive the system by a mechanical driving with a nonzero *** obtain the essential conditions for perfect optical nonreciprocity and analyze properties of the optical nonreciprocal *** results can be used to control optical transmission in quantum information processing.

关键词： cavity optomechanics optical nonreciprocity nonreciprocal transmission mechanical driving

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BDS/GPS deformation analysis of a long-span cable-stayed bridge based on colored noise filtering

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Geodesy and Geodynamics 2023年第2期14卷 163-171页

作者： Jun Ma China Railway Siyuan Survey and Design Group Co. LTDWuhan 430079China School of Surveying and mapping Wuhan UniversityWuhan 430079China

Combining GPS and BDS technology to monitor the deformation of long-span railway bridges with stricter deformation control requirements is of significance to the safety and control of the bridge and the safety of railway *** studies have ignored the influence of coloured noise in the deformation time *** is not conducive to accurate deformation analysis of long-span railway ***,GPS,BDS and GPS/BDS monitoring data of Ganjiang Bridge located in Ganzhou city,Jiangxi province,China are adopted in this paper to filter the coloured noise in the deformation time series by principal component analysis(PCA),and the influence of coloured noise on the deformation analysis results of railway bridge is *** experimental results show that the diurnal temperature difference causes the mid-span and the tower of the railway cable-stayed bridge to deform with a period of about one day in the vertical and longitudinal directions,*** colored noise will make the uncertainty of the deformation parameter estimation overly *** can significantly reduce the coloured noise,and thus reduce the uncertainty of deformation parameter estimation by about 73%.Moreover,the average difference between the daily periodic motion amplitudes of the monitoring points obtained by using GPS and BDS deformation time series is 1.65 *** use of GPS/BDS deformation time series is not only helpful to reduce the influence of coloured noise,but also can reduce the difference between amplitude analysis results obtained from GPS and BDS deformation time series.

关键词： Long-span railway bridges GNSS deformation monitoring Coloured noise PCA

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