In this paper, we present the results of numerical analysis of optical solitons in dual core couplers. We studied the optical couplers as an application for the non-linear Schrödinger equation in the case of ...In this paper, we present the results of numerical analysis of optical solitons in dual core couplers. We studied the optical couplers as an application for the non-linear Schrödinger equation in the case of Kerr law for non-linear and clarify the exact solution in this case. Then we have provided a numerical study of the effect of changing the constants in the form of the three types of solitons: bright soliton and dark solitons and singular soliton.展开更多
This paper theoretically investigates the dependence of leaky mode coupling between inner core fundamental mode and outer core defect mode on phase and loss matching in pure silica dual-core photonic crystal fibres wi...This paper theoretically investigates the dependence of leaky mode coupling between inner core fundamental mode and outer core defect mode on phase and loss matching in pure silica dual-core photonic crystal fibres with the multi-pole method. The complete mode coupling can take place when both the phase and loss matching conditions are satisfied at the avoided anti-crossing wavelength. It shows the influences of cladding structure parameters including the diameters of cladding air holes d1, diameters of outer core holes d2 and hole to hole pitch Λ on the characteristics of leaky modes coupling. The coupled-mode theory is used to analyse the mode transition characteristics and the complete coupling can be clearly indicated by comparing the real and imaginary parts of propagation constant of the leaky modes.展开更多
An ultra-broadband polarization splitter based on graphene layer-filled dual-core photonic crystal fiber(GDC-PCF)that can work in a wavelength range from 1120 nm to 1730 nm is proposed in this paper. Through optimizin...An ultra-broadband polarization splitter based on graphene layer-filled dual-core photonic crystal fiber(GDC-PCF)that can work in a wavelength range from 1120 nm to 1730 nm is proposed in this paper. Through optimizing fiber configuration, the polarization splitter has an extinction ratio of-56.3 dB at 1.55 μm with a fiber length of 4.8 mm.Compared with the photonic crystal fiber reported splitters, to our knowledge, the GDC-PCF splitter with the extinction ratio below-20 dB has a super wide bandwidth of 610 nm. Due to the excellent splitting characteristics, the GDC-PCF will be used in coherent optical communication systems in a wavelength range from infrared to mid-infraed.展开更多
As known,the method to obtain a sequence space by using convergence field of an infinite matrix is an old method in the theory of sequence spaces.However,the study of convergence field of an infinite matrix in the spa...As known,the method to obtain a sequence space by using convergence field of an infinite matrix is an old method in the theory of sequence spaces.However,the study of convergence field of an infinite matrix in the space of almost convergent sequences is so new(see [15]).The purpose of this paper is to introduce the new spaces f and f0 consisting of all sequences whose Cesa`ro transforms of order one are in the spaces f and f0,respectively.Also,in this paper,we show that f and f0 are linearly isomorphic to the spaces f and f0,respectively.The β-and γ-duals of the spaces f and f0 are computed.Furthermore,the classes(f:) and(:f) of infinite matrices are characterized for any given sequence space,and determined the necessary and sufficient conditions on a matrix A to satisfy BC-core(Ax) K-core(x),K-core(Ax) BC-core(x),BC-core(Ax) BC-core(x),BC-core(Ax) st-core(x) for all x ∈∞.展开更多
针对三冗余机电静压伺服系统的研制需求,设计了基于双核全可编程片上系统(All Programmable System on Chip,APSoC)技术的多总线三冗余伺服控制驱动器。通过数字总线实现子控制驱动模块之间信息共享,采用IP核技术实现硬件加速、多电机...针对三冗余机电静压伺服系统的研制需求,设计了基于双核全可编程片上系统(All Programmable System on Chip,APSoC)技术的多总线三冗余伺服控制驱动器。通过数字总线实现子控制驱动模块之间信息共享,采用IP核技术实现硬件加速、多电机高速并行控制;通过试验验证多电机控制的同步性能和测量细节全还原技术;采用多种温度、压力传感器、过流保护电路等构建伺服系统健康网络体系,结合余度表决和故障切除逻辑搭建了三冗余控制驱动平台,对多任务的不同实时性需求分配任务等级,双核协同工作,研制的产品实物通过了系统验证。展开更多
文摘In this paper, we present the results of numerical analysis of optical solitons in dual core couplers. We studied the optical couplers as an application for the non-linear Schrödinger equation in the case of Kerr law for non-linear and clarify the exact solution in this case. Then we have provided a numerical study of the effect of changing the constants in the form of the three types of solitons: bright soliton and dark solitons and singular soliton.
基金Project supported by the National Key Basic Research Special Foundation of China (Grant No. 2010CB327605)the National High-Technology Research and Development Program of China (Grant No. 2009AA01Z220)+2 种基金the Key Grant of the Chinese Ministry of Education (Grant No. 109015)the Discipline Co-construction Project of Beijing Municipal Commission of Education (Grant No. YB20081001301)the Open Fund of Key Laboratory of Information Photonics and Optical Communications (Beijing University of Posts and Telecommunications), Ministry of Education,and the Specialized Research Fund for the Doctoral Program of Beijing University of Posts and Telecommunications (Grant No. CX201023)
文摘This paper theoretically investigates the dependence of leaky mode coupling between inner core fundamental mode and outer core defect mode on phase and loss matching in pure silica dual-core photonic crystal fibres with the multi-pole method. The complete mode coupling can take place when both the phase and loss matching conditions are satisfied at the avoided anti-crossing wavelength. It shows the influences of cladding structure parameters including the diameters of cladding air holes d1, diameters of outer core holes d2 and hole to hole pitch Λ on the characteristics of leaky modes coupling. The coupled-mode theory is used to analyse the mode transition characteristics and the complete coupling can be clearly indicated by comparing the real and imaginary parts of propagation constant of the leaky modes.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61405096 and 61504058)the Introduction of Talent Research and Research Fund of Nanjing University of Posts and Telecommunications,China(Grant No.NY214158)+1 种基金the Open Fund of Laboratory of Solid State Microstructures,Nanjing University,China(Grant No.M28035)the Open Fund of State Key Laboratory of Transient Optics and Photonics,Chinese Academy of Sciences(Grant No.SKLST201404)
文摘An ultra-broadband polarization splitter based on graphene layer-filled dual-core photonic crystal fiber(GDC-PCF)that can work in a wavelength range from 1120 nm to 1730 nm is proposed in this paper. Through optimizing fiber configuration, the polarization splitter has an extinction ratio of-56.3 dB at 1.55 μm with a fiber length of 4.8 mm.Compared with the photonic crystal fiber reported splitters, to our knowledge, the GDC-PCF splitter with the extinction ratio below-20 dB has a super wide bandwidth of 610 nm. Due to the excellent splitting characteristics, the GDC-PCF will be used in coherent optical communication systems in a wavelength range from infrared to mid-infraed.
文摘As known,the method to obtain a sequence space by using convergence field of an infinite matrix is an old method in the theory of sequence spaces.However,the study of convergence field of an infinite matrix in the space of almost convergent sequences is so new(see [15]).The purpose of this paper is to introduce the new spaces f and f0 consisting of all sequences whose Cesa`ro transforms of order one are in the spaces f and f0,respectively.Also,in this paper,we show that f and f0 are linearly isomorphic to the spaces f and f0,respectively.The β-and γ-duals of the spaces f and f0 are computed.Furthermore,the classes(f:) and(:f) of infinite matrices are characterized for any given sequence space,and determined the necessary and sufficient conditions on a matrix A to satisfy BC-core(Ax) K-core(x),K-core(Ax) BC-core(x),BC-core(Ax) BC-core(x),BC-core(Ax) st-core(x) for all x ∈∞.
文摘针对三冗余机电静压伺服系统的研制需求,设计了基于双核全可编程片上系统(All Programmable System on Chip,APSoC)技术的多总线三冗余伺服控制驱动器。通过数字总线实现子控制驱动模块之间信息共享,采用IP核技术实现硬件加速、多电机高速并行控制;通过试验验证多电机控制的同步性能和测量细节全还原技术;采用多种温度、压力传感器、过流保护电路等构建伺服系统健康网络体系,结合余度表决和故障切除逻辑搭建了三冗余控制驱动平台,对多任务的不同实时性需求分配任务等级,双核协同工作,研制的产品实物通过了系统验证。
