In 40 Gb/s systems with low polarization-mode dispersion(PMD) fibers,first-order PMD is the dominate factor with quite small value. An adaptive PMD compensator consisting of an electrical polarization controller(PC) ,...In 40 Gb/s systems with low polarization-mode dispersion(PMD) fibers,first-order PMD is the dominate factor with quite small value. An adaptive PMD compensator consisting of an electrical polarization controller(PC) ,a section of polariza-tion maintaining fiber(PMF) ,a degree of polarization(DOP) detector and a feedback control module is employed in 40 Gb/s NSFCNet. This compensator has a simple structure and high speed,which can compensate up to 20 ps first-order PMD adaptively and the average searching time is 2 ms.展开更多
P427.1 96042788激光热晕补偿数值模抉计算与实验=Numericalcomputation and experiment of laser thermalblooming and compensation[刊,中]/万敏,苏毅,张凯,易亨瑜.孙和平(中国工程物理研究院应用电子学研究所.四川,成都(610003))
U43 98032093用于波前补偿实验的对流湍流系统的光学特性=Op-tical characteristics of laboratory—generatedconvective turbulence system for wavefrontdistortion compensation[刊,中]/张骏,曾宗泳,肖黎明,马成胜,翁宁泉(中科院安...U43 98032093用于波前补偿实验的对流湍流系统的光学特性=Op-tical characteristics of laboratory—generatedconvective turbulence system for wavefrontdistortion compensation[刊,中]/张骏,曾宗泳,肖黎明,马成胜,翁宁泉(中科院安徽光机所.安徽,合肥(230031))∥光学学报.—1997,17(9).—1259—1264描述一种用于波前补偿实验的对流湍流系统。展开更多
P183.4 2001010725有限光束相位共轭实时大气湍流补偿实验=Experiments of real-time atmosphericturbulence compensation with phase conjugation of limited beams[刊,中]/高晓明,张为俊,王沛,葛传文,程平,杨,韩亚农(中科院安徽光机...P183.4 2001010725有限光束相位共轭实时大气湍流补偿实验=Experiments of real-time atmosphericturbulence compensation with phase conjugation of limited beams[刊,中]/高晓明,张为俊,王沛,葛传文,程平,杨,韩亚农(中科院安徽光机所激光光谱开放实验室.安徽,合肥(230031)),吴毅,王英俭,龚知本(中科院安徽光机所大气光学重点实验室.安徽,合肥(230031))∥光学学报.-2000,20(2).-283-285报道了在距地面4 m高的1000 m水平传输通道上,通过改变光束的尺寸研究取样孔径对相位共轭补偿特性的影响。研究结果表明。展开更多
The scattering-model-based(SMB)speckle filtering for polarimetric SAR(Pol SAR)data is reasonably effective in preserving dominant scattering mechanisms.However,the efficiency strongly depends on the accuracies of both...The scattering-model-based(SMB)speckle filtering for polarimetric SAR(Pol SAR)data is reasonably effective in preserving dominant scattering mechanisms.However,the efficiency strongly depends on the accuracies of both the decomposition and classification of the scattering properties.In addition,a relatively weak speckle reduction particularly in distributed media was reported in the related literatures.In this work,an improved SMB filtering strategy is proposed considering the aforementioned deficiencies.First,the orientation angle compensation is incorporated into the SMB filtering process to remedy the overestimation of the volume scattering contribution in the Freeman-Durden decomposition.In addition,an algorithm to select the homogenous pixels is developed based on the spatial majority rule for adaptive speckle reduction.We demonstrate the superiority of the proposed methods in terms of scattering property preservation and speckle noise reduction using L-band Pol SAR data sets of San Francisco that were acquired by the NASA/JPL airborne SAR(AIRSAR)system.展开更多
For a 100 GHz DWDM angle-tuned filter with low polarization dependent loss,the insertion loss and the Gaussian-transformation tendency of the transmission spectrum will become more serious as the incident angle is inc...For a 100 GHz DWDM angle-tuned filter with low polarization dependent loss,the insertion loss and the Gaussian-transformation tendency of the transmission spectrum will become more serious as the incident angle is increased. It is because of that the optical path and the transmission modes of the thin film filter will change when the incident angle is varied. According to the thin film matrix theory,the analysis model is established,the displacement change of the transmission field is simulated,and a dynamic compensation fitting is also designed and fabricated in the paper. The experimental results show that it can effectively reduce the insertion loss and the phenomenon of Gaussian process. Using the compensation fitting,the tunable range of the filter is at about 20 nm which coincides with the theoretical design.展开更多
Ground-satellite quantum key distribution(QKD)is a feasible way to implement global-scale quantum communication.Herein we propose an approach to dynamically compensate the polarization of the photons when passing thro...Ground-satellite quantum key distribution(QKD)is a feasible way to implement global-scale quantum communication.Herein we propose an approach to dynamically compensate the polarization of the photons when passing through the optical telescope used in ground-satellite QKD.Our results experimentally demonstrate that the fidelity of any polarization state after dynamic compensation can be achieved by more than 99.5%,which fulfills the requirements of ground-satellite QKD.展开更多
文摘In 40 Gb/s systems with low polarization-mode dispersion(PMD) fibers,first-order PMD is the dominate factor with quite small value. An adaptive PMD compensator consisting of an electrical polarization controller(PC) ,a section of polariza-tion maintaining fiber(PMF) ,a degree of polarization(DOP) detector and a feedback control module is employed in 40 Gb/s NSFCNet. This compensator has a simple structure and high speed,which can compensate up to 20 ps first-order PMD adaptively and the average searching time is 2 ms.
文摘P427.1 96042788激光热晕补偿数值模抉计算与实验=Numericalcomputation and experiment of laser thermalblooming and compensation[刊,中]/万敏,苏毅,张凯,易亨瑜.孙和平(中国工程物理研究院应用电子学研究所.四川,成都(610003))
文摘U43 98032093用于波前补偿实验的对流湍流系统的光学特性=Op-tical characteristics of laboratory—generatedconvective turbulence system for wavefrontdistortion compensation[刊,中]/张骏,曾宗泳,肖黎明,马成胜,翁宁泉(中科院安徽光机所.安徽,合肥(230031))∥光学学报.—1997,17(9).—1259—1264描述一种用于波前补偿实验的对流湍流系统。
文摘P183.4 2001010725有限光束相位共轭实时大气湍流补偿实验=Experiments of real-time atmosphericturbulence compensation with phase conjugation of limited beams[刊,中]/高晓明,张为俊,王沛,葛传文,程平,杨,韩亚农(中科院安徽光机所激光光谱开放实验室.安徽,合肥(230031)),吴毅,王英俭,龚知本(中科院安徽光机所大气光学重点实验室.安徽,合肥(230031))∥光学学报.-2000,20(2).-283-285报道了在距地面4 m高的1000 m水平传输通道上,通过改变光束的尺寸研究取样孔径对相位共轭补偿特性的影响。研究结果表明。
基金Project(2012CB957702) supported by the National Basic Research Program of ChinaProjects(41590854,41431070,41274024,41321063) supported by the National Natural Science Foundation of ChinaProject(Y205771077) supported by the Hundred Talents Program of the Chinese Academy of Sciences
文摘The scattering-model-based(SMB)speckle filtering for polarimetric SAR(Pol SAR)data is reasonably effective in preserving dominant scattering mechanisms.However,the efficiency strongly depends on the accuracies of both the decomposition and classification of the scattering properties.In addition,a relatively weak speckle reduction particularly in distributed media was reported in the related literatures.In this work,an improved SMB filtering strategy is proposed considering the aforementioned deficiencies.First,the orientation angle compensation is incorporated into the SMB filtering process to remedy the overestimation of the volume scattering contribution in the Freeman-Durden decomposition.In addition,an algorithm to select the homogenous pixels is developed based on the spatial majority rule for adaptive speckle reduction.We demonstrate the superiority of the proposed methods in terms of scattering property preservation and speckle noise reduction using L-band Pol SAR data sets of San Francisco that were acquired by the NASA/JPL airborne SAR(AIRSAR)system.
文摘For a 100 GHz DWDM angle-tuned filter with low polarization dependent loss,the insertion loss and the Gaussian-transformation tendency of the transmission spectrum will become more serious as the incident angle is increased. It is because of that the optical path and the transmission modes of the thin film filter will change when the incident angle is varied. According to the thin film matrix theory,the analysis model is established,the displacement change of the transmission field is simulated,and a dynamic compensation fitting is also designed and fabricated in the paper. The experimental results show that it can effectively reduce the insertion loss and the phenomenon of Gaussian process. Using the compensation fitting,the tunable range of the filter is at about 20 nm which coincides with the theoretical design.
基金supported by the National Natural Science Foundation of China(Grant No.11274296)Zhejiang Provincial Natural Science Foundation of China(Grant No.LY13F050007)K.C.Wong Magna Fund in Ningbo University
文摘Ground-satellite quantum key distribution(QKD)is a feasible way to implement global-scale quantum communication.Herein we propose an approach to dynamically compensate the polarization of the photons when passing through the optical telescope used in ground-satellite QKD.Our results experimentally demonstrate that the fidelity of any polarization state after dynamic compensation can be achieved by more than 99.5%,which fulfills the requirements of ground-satellite QKD.
