PS~(-1) Optical Interconnection of 2N×2N Using N×N Holographic Lens Array

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2×N阶梯形网络对角等效电阻的规律

研究了 2×N阶梯形网络的对角等效电阻 ,通过网络分析构建差分方程模型 ,给出了 2×N阶梯形网络对角等效电阻的二个基本规律。     

构建等效模型研究2×N阶网络的等效电阻

研究了更一般的2×N阶电阻网络的等效电阻,通过分析2×N阶梯形电阻网络的结构特点,构建出电阻网络的等效模型,并且构建巧妙的变换方法,给出了2×N阶梯形电阻网络的一个普适规律和趋于无穷时的极限规律.     

Surface phonon dispersion of Cu(100)c(2×2)N

The Cu(100) surface covered with atomic nitrogen has been studied with low energy electron diffraction (LEED), Auger electron spectroscopy (AES) and inelastic electron scattering (EELS). Atomic nitrogen, formed by thermal dissociation of NH₃ adsorbed at 100 K, forms a c(2×2) overlayer on the Cu(100) surface. The dispersion of adsorbate and substrate associated modes of the Cu(100) surface covered with a c(2×2) nitrogen overlayer has been measured along the two dimensional Brillouin zone in the - by inelastic electron scattering. The experimental data are compared to a lattice dynamical slab calculation. The Rayleigh-mode (S₄-phonon) is only slightly changed by the N-overlayer. An optimum fit for the perpendicular and parallel nitrogen modes (=320 cm^–1 and =740 cm^–1 at =0.1) is obtained when the nitrogen atom is placed 0.6 Å above the first copper layer.     

单块晶体集成的N×N纵横开关网络及其控制算法

设计了一种单块晶体集成的n×n纵横开关(Crossbar)网络。通过综合考虑晶体的双折射和全内双反射现象,以及晶体的电光效应,将构成n×n纵横开关网络的所有单元器件都集成到一块具有电光效应的双折射晶体上。同时,给出了该网络的控制算法,通过对开关工作状态的控制,可以实现任意输入输出通道之间的无阻塞连接。这种单块晶体集成的纵横开关网络具有能量损耗低、无阻塞、易安装、抗干扰等优点,适合于全光网络发展的需要。     

基于二维多模干涉效应的N×N光开关模型

报道了由两个N×N三维多模干涉耦合器和一段阵列相移波导组成的三维光开关.首先利用导模传输法分析了三维多模干涉耦合器的一般成像原理,并推导出了其成像位置以及相位矩阵.在此基础上,通过场传输矩阵法建立了光开关的传输方程.利用该传输方程计算得到了光开关工作时,阵列相移波导的相位条件,并通过三维有限差分光束传输法进行仿真验证,...     

单块晶体2×2光开关

利用晶体的双折射和全内双反射现象以及晶体的电光效应 ,设计了一种单块晶体集成的 2× 2光开关 ,将一个电光调制器和两个光束分束器集成到一块铌酸锂晶体上 ,实现了光束合束、偏振态调制和光束分束三种功能。根据这种光开关的工作原理 ,给出两种开关结构 ,一种是易于级联的垂直入射结构 ,另一种是有较低操作电压的倾斜入射结构 ,并对倾斜入射结构的光开关进行了制作和测试。实验结果表明 :这种集成结构的 2× 2光开关操作电压低 ,串扰小 ,能量损耗小 ,抗干扰 ,稳定可靠 ,适用于各种光学互连网络。     

与偏振无关双向2×2和4×4自由空间光开关

利用成熟的偏振控制技术,设计了一种由偏振光分束器、相位型空间光调制器和反射镜构成的2×2光开关,该光开关所用器件少,具有结构简单紧凑、控制灵活方便、功能实现与信号光的偏振态无关以及可以双向交换等特点;在此基础上通过2×2光开关的串连,设计了一种与偏振无关的双向4×4光开关的实验模块,根据其路由选择与控制方法,得到了4×4光开关实现信号光全排列无阻塞输出与交换对应的路由状态表,并对该实验模块的功能实现进行了详细的分析与讨论。     

保偏光纤2×2定向耦合器

介绍一种已研制成的低损耗、宽带、结构紧凑的保偏光纤定向耦合器(PPFDC),它可用于今后的相干纤维光学传输系统或陀螺仪上。这种耦合器由两块直径为200μm蓝宝石球透镜、一块3dB分光器和四根锥形氧化铝陶瓷套管组成,套管上的基准扁平面用于使光纤在接点保持偏振。由于直管内光纤只有很短一段经过抛光,故光纤的固有热应力变化最小。光轴和机械轴成一定角度,因而光纤端面或透镜表面不会出现串扰光。耦合器的光学方向性大于50dB,在1.3μm波长区的反射损耗大于40dB。在1.2到1.4μm内的过量损耗小于1dB。消光比大于25dB。耦合器耦合区的长度包括两块球透镜和分光器在内约1mm,光纤端面分布反馈激光二极管的谱线宽度用耦合器由延迟自零检测系统测量。采用调相耦合器的新型保偏光纤陀螺仪的实验结果表明,灵敏度和稳定度均是适用的。这些实验结果证实耦合器的上述各种特性均是正确的。     

GaAs2×2Mach-Zehnder光波导开关调制器

报道了GaAs2×2非对称Mach-Zehnder光波导开关调制器的研制结果,分析了这种开关的工作原理和产生串音的因素.采用两个非对称X型耦合器代替传统的Y分支耦合器,得到了性能良好的X型3dB耦合器.λ=1.15μm时,器件的串音比小于-22.4dB,开关电压约1.2V.     

高精度2×2阵列拼接光栅结构设计

 提出了一种大口径高精度2×2阵列光栅拼接结构,采用模块化和框架式结构设计,保证拼接结构的稳定性;设计了差动螺纹微调组件与压电驱动器相结合的微纳调整组件结构,实现拼接光栅微纳量级的调整要求;讨论了关键组件的设计和制造问题。设计制造的2×2阵列光栅实验样机的最大相对共面误差为17 μm,微纳调整组件的最小调整精度可以达到1.8 nm,分辨力为0.9 nm,初步光路实验表明,设计的拼接调整机构可以快速实时地调整2×2阵列光栅达到要求的精度,且稳定时间大于1 h。     

Two-Player 2 × 2 Quantum Game in Spin System

In this work, we study the payoffs of quantum Samaritan’s dilemma played with the thermal entangled state of XXZ spin model in the presence of Dzyaloshinskii-Moriya (DM) interaction. We discuss the effect of anisotropy parameter, strength of DM interaction and temperature on quantum Samaritan’s dilemma. It is shown that although increasing DM interaction and anisotropy parameter generate entanglement, players payoffs are not simply decided by entanglement and depend on other game components such as strategy and payoff measurement. In general, Entanglement and Alice’s payoff evolve to a relatively stable value with anisotropy parameter, and develop to a fixed value with DM interaction strength, while Bob’s payoff changes in the reverse direction. It is noted that the augment of Alice’s payoff compensates for the loss of Bob’s payoff. For different strategies, payoffs have different changes with temperature. Our results and discussions can be analogously generalized to other 2 × 2 quantum static games in various spin models.     

4×2×3阵列式放大器参数测量系统优化设计

 采用软边光阑和多级空间滤波器组合技术实现了光束的空间整形和等像面传输，利用Fresnel光束传输计算程序对4×2×3阵列式放大器参数测量系统进行了优化设计，分析了空间滤波器中小孔尺寸对光束波面传输的影响，并对优化设计结果进行了分析和讨论，所用方法和所得结论对高功率固体激光放大系统的设计有应用意义。     

4×2×3阵列式放大器参数测量系统优化设计

采用软边光阑和多级空间滤波器组合技术实现了光束的空间整形和等像面传输，利用Fresnel光束传输计算程序对4×2×3阵列式放大器参数测量系统进行了优化设计，分析了空间滤波器中小孔尺寸对光束波面传输的影响，并对优化设计结果进行了分析和讨论，所用方法和所得结论对高功率固体激光放大系统的设计有应用意义。     

Spatial extension of quantum gravitational particles inR 4×K N

It is observed that the magnitude relationma ² l _P/c holds if the non-Euclidean incremental spatial volume associated with a fundamental particle of massm and radiusa is characteristically quantum gravitational in a Kaluza-Klein or superstringR ⁴×K ^N . HereR ⁴ is the four-dimensional Riemannian space-time of general relativity andK ^N is a small-scale, compact,N-dimensional space of characteristic quantum gravitational volumel _P ^N , withl _P (G/c ³)^1/2= 1.61×10^–33 cm denoting the Planck length. For the electron and electron neutrino (assumed to possess nonzero mass bounded empirically by <30 eV) the derived magnitude relationa(l _P/mc)^1/2 yields the estimatesa _e 2.5×10^–22 cm and 3.3×10^–20 cm, spatial extensions which may be detectable by way of fine-scale effects in SSC experiments.     

Symplectic three-algebra and \mathcal{N}=6, Sp(2N)×U(1) superconformal Chern–Simons-matter theory

We introduce an antisymmetric metric into a 3-algebra and call it a symplectic 3-algebra. The $\mathcal{N}=6$ , Sp(2N)×U(1) superconformal Chern–Simons-matter theory with SU(4) R-symmetry in three dimensions is constructed by specifying the 3-brackets in a symplectic 3-algebra. We also demonstrate that the $\mathcal{N}=6$ , U(M)×U(N) theory can be recast into this symplectic 3-algebraic framework.     

A 2×2 spatial optical switch based on PT-symmetry

We show a PT-symmetric coupler having an arm with a tunable gain and a no-loss arm when appropriately designed to possess reciprocal behavior, unlike its rivals having a fixed gain/loss arm, can perform as a tunable 2×2 spatial optical switch. The degree of the tunability equals the ratio of the coupler's length to the total coupling length.