DRFM相位校正技术研究

DRFM复制信号的相位不连续会破坏输出信号的相干性，影响干扰效果。将信号取样的起始和终止相位之差记录下来，并在信号复制时进行相位补偿的新技术，可以消除复制信号首尾相位差，并简化电路。3比特相位DRFM中相位校正的精度优于π／4。     

基于相位偏移的条纹投影相位误差补偿方法研究

相移条纹投影技术三维成像的过程中，受设备非线性效应影响存在相位误差。针对相位误差的周期特性，引入相位偏移算法，提出一种非线性相位误差全场补偿方法。利用非线性相位误差的偏移变化，结合多个包裹相位的相位值选取特定阈值，最后使用算法遍历全场相位信息获取理想相位。实验结果显示校正后的误差点数是校正前的2.52%,证实了方法的有效性，通过与其他方法进行数据对比分析，表明所提方法修正相位误差效果有所提高。     

射频应用的压控振荡器相位噪声的研究

相位噪声是压控振荡器（VCO）的关键参数之一。本文阐述了VCO相位噪声的特性，分析了时不变和时变两种相位噪声模型，给出了优化相位噪声的方法。     

直接数字式频率合成器的相位截断误差的分析

介绍了直接数字式频率合成器的原理以及相位截断的概念，并给出了相位截断误差的表达式，最后给出了直接数字式频率合成器无相位截断点头的设计方法，并给出了实验结果。     

面向结构光三维测量的相位展开技术综述(特邀)

结构光三维形貌测量方法越来越多地应用于逆向工程、航空航天、生物医学、文物保护等领域。相位展开作为结构光三维测量中的一个关键环节对测量精度、速度和可靠性起着决定性作用。文中综述了相位展开技术的基本原理、国内外研究现状、各类方法的优缺点和未来发展方向。首先根据相位展开计算方法不同，将现有的用于结构光三维形貌测量技术的相位展开技术分为以下四类进行详细的介绍：时间相位展开技术、空间相位展开技术、基于深度学习的相位展开技术和其他相位展开技术；然后详细比较了各种技术的优缺点；最后总结了相位展开技术的特点并展望了该技术的未来研究方向。基于文中综述的内容，研究者们可用于了解各类相位展开技术的原理与进展，进而根据不同方法的特点对比结合应用需求和测量条件选择最有效的相位展开技术，实现三维形貌的精确测量。     

二维相位干涉仪原理及其在短波战术测向机中的应用

本文在二维单基线、多基线相位干涉仪原理的基础上，介绍了基线相位模糊概念，提出了解相位模糊的基本思路和方法．针对短波战术干涉仪测向机，给出了五元测向天线布阵，并分析了其解相位模糊的性能。     

一种新型相位补偿与均衡技术

为了提高通信质量，使信号无失真地传输，均衡技术广泛地应用于通信系统中，本文介绍一种新型相位均衡技术－－ＳＡＷ相位均衡技术，这种相位均衡技术可直接在中频甚至射频均衡，在许多通信系统中具有广阔的应用前景。文中介绍了几种ＳＡＷ相位均衡器的构造方法。     

结环行器的相位特性

利用带线结环行器的相关理论，导出了结环行器的相位特性，并进而分析环行器的常规参数与插入相位变化的关系，通过实验验证了理论结果，对环行器的设计，调试具有一定的指导意义。     

和差两路相位不平衡性探讨

对和差两路相位的形成、影响相位不平衡性因素进行详细的分析，并在此基础上，提出减小和差两路相位差的方法。     

本振相位噪声对OFDM的影响及仿真

讨论了相位噪声对OFDM系统引起的两种干扰——公共相位噪声和信道间干扰，给出了干扰功率与信号功率的比值；建立和仿真了本振为自由振荡器时相位噪声的功率谱密度摸型；仿真了相位噪声对信道间干扰、系统误码率的影响。     

Evolution of Quantum States in an Electro-Optic Phase Modulator

We present a quantum mechanical model to evaluate the time evolution of quantum states of light in an electro-optic phase modulator (EOPM). The phase modulator is analogous to a multilevel atomic system with equally spaced energy levels, each of which corresponds to the sidebands of the phase modulated optical field. Using perturbation theory, we solve the equations governing the interaction of the optical field with a modulating field both with and without phase velocity mismatch. A unitary operator that evolves any given quantum state allows us to evaluate the response of EOPM for single photon, coherent and squeezed states. We apply these results to the analysis of frequency coded quantum key distribution scheme.     

Relativistic Dynamics,Electromagnetic Field,and Spin,as All Quantum Effects

We consider a quantum particle as a wave packet in the coordinate space. When the conjugate wave packet in the momentum space is considered, we find that the group velocities of these two wave packets, which describe the particle dynamics, are in agreement with the Hamilton equations only if in the time dependent phases one considers the Lagrangian instead of the Hamiltonian which leads to the conventional Schrdinger equation. We define a relativistic quantum principle asserting that a quantum particle has a finite frequency spectrum, with a cutoff propagation velocity c as a universal constant not depending on the coordinate system, and that any time dependent phase variation is the same in any system of coordinates. From the time dependent phase invariance, the relativistic kinematics is obtained. We consider two types of possible interactions: 1) An interaction with an external field, by a modification of the time dependent phase differential with the terms proportional to the differentials of the space-time coordinates multiplied with the components of this field four-potential, and 2) an interaction by a deformation of the space-time coordinates, due to a gravitational field. From the invariance of the time dependent phase with field components, we obtain a mechanical force of the form of Lorentzs force, and three Maxwell equations: The Gauss-Maxwell equations for the electric and magnetic fluxes, and the Faraday-Maxwell equation for the electromagnetic induction. When the fourth equation, Ampre-Maxwell, is considered, the interaction field takes the form of the electromagnetic field. For a low propagation velocity of the particle waves, we get a packet of waves with the time dependent phases proportional to the relativistic Hamiltonian, as in Diracs famous theory of spin, and a slowly-varying amplitude with a phase proportional to the momentum and this velocity. In the framework of our theory, the spin is obtained as an all quantum effect, without any additional assumption to the quantum theory. When a space-time deformation is considered in the time dependent phase of a quantum particle, from the group velocity we get the particle dynamics according to the general theory of relativity. In this way, the relativistic dynamics, the electromagnetic field, and the spin of a quantum particle are obtained only from the invariance of the time dependent phases of the particle wave functions.     

Effect of Transverse Electric Field on Polariton Reflectance Spectra of Wide Quantum Wells

Excitonic waves propagating in thick GaAs/AlGaAs quantum wells form an interference pattern, which is observed as oscillations in the reflectance spectra. Oscillations in the spectra of wide GaAs quantum wells should reveal a non-trivial behavior as a function of the external uniform electric field as it is found in the theory developed in the present work. The oscillations are suppressed as the electric field increases and then reappear again with an opposite phase at the further rise of the field.     

Raman跃迁中原子的熵压缩

运用量子信息熵理论研究了Raman跃迁中原子的熵压缩特性.讨论了系统初态参数对原子信息熵压缩的影响.结果表明:信息熵压缩的分量数、压缩方向、压缩深度可以由原子的分布角、双模相干场相对位相和平均光子数的选取来控制.结果证明了信息熵能实现对原子压缩效应的高灵敏量度.     

非对称两态叠加多模叠加态光场的等幂次N次方H压缩

根据量子力学的态叠加原理,构造了由强度不相等的两个多模复共轭相干态|{z_j~((a)*)}〉_q和|{z_j~((b)*)}〉_q,这两者的线性叠加所组成的非对称两态叠加多模叠加态光场|Ψ〉_q。利用多模压缩态理论,研究了态|Ψ〉_q的等幂次N次方H压缩特性,结果表明:当满足一定的相位条件时,无论腔模总数q与压缩次数N两者之积qN是奇数还是偶数,态|Ψ〉_q的两个正交相位分量总可分别呈现出等幂次N次方H压缩效应。     

Power spectrum measurement of a modulated semiconductor laser usingan interferometric self-homodyne technique: influence of quantum phasenoise and field correlation

The amplitude-phase coupling effect introduces important dynamic line broadening in modulated semiconductor laser systems. The theory of a technique allowing measurement of the broadened spectrum using a single laser is presented. The quantum phase fluctuations of the lasing field are shown to be of great importance to the photocurrent spectrum of the mixed fields. Expressions for the photocurrent spectrum, which is shown to measure the optical field modulation power spectrum, are derived. Measurement results illustrating the theory are also presented     

CO2激光脉冲外差探测一阶统计特性分析

从分析高斯本振光和爱里信号回波互相干函数 (或外差量子效率 )一阶统计量入手 ,推导出CO2 激光脉冲外差探测振幅、位相和波矢空间夹角匹配条件 ,其外差量子效率的最大理论值为 0 82。在离焦失准状态下 (即球像差 ) ,两束光的位相差主要由高斯本振光波前弯曲决定 ,并因此导致外差量子效率的降低。     

InGaAsP/GaAs单量子阱半导体激光器光学特性的研究

用改进的液相外延方法 L PE 生长了无铝的 In Ga As P/Ga As分别限制单量子阱半导体激光器 ,测量其远场分布近似为高斯分布 .用缓变波导理论分析了产生这种分布所对应的光波导结构的折射率分布模型 ,并简单解释了其生成原因 ,为改善光束质量提供了参考     

Electric field effect on weak localization in a semiconductor quantum wire

The influence of an electric field on weak localization in a semiconductor quantum wire is studied by a recently proposed generalized quantum Langevin equation approach to the conductivity problem. A new physical picture is presented. In our model the electronic motion is essentially one-dimensional, and the phase coherence length ℓ_φ is much larger than the elastic mean free path ℓ₂ of electrons. We find that when the electric field E exceeds a critical value E_c = KV_F/eℓ_φ, where V_F is the Fermi velocity, it will introduce a new cut-off length with implications for the experimental results on semiconductor quantum wires. Our theory is in good agreement with the experiments of Hiramoto and co-workers.     

Tavis-Cummings模型系统中光场的相位特性

本文应用全量子理论研究了单模强相干光场与两个全同的二能级原子相互作用的Tavis－Cummings（T－C）模型系统中光场相位的演化特性．具体计算了光场厄米相位算符的期望值、相位概率分布及相位涨落，并讨论了原子间的偶极相互作用和原子的初始相干性对光场相位性质的影响．