共查询到20条相似文献,搜索用时 31 毫秒
1.
根据TE0模光波导的本征场分布、瑞利索末菲标量衍射积分公式和激励源与光波导耦合的匹配效率公式,给出光波导端面衍射和耦合的归一化发射系数和接收系数计算公式,推导出光波导端面非接触耦合的耦合效率计算公式。光波导模场分布采用高斯函数近似表达,给出简洁的计算光波导端面非接触耦合的耦合效率函数表达式。最后,基于星形光波导耦合器结构参量的特点,将累加运算采用积分运算近似表达,给出星形光波导耦合器接收光波导总的接收效率与耦合器基本参量的关系,阐明了星形光波导耦合器的耦合特性。 相似文献
2.
本文求得了单模双包层光纤之间耦合系数精确的解析表达式.计算了上升内包层、匹配包层和凹陷内包层光纤耦合系数随归一化频率V的关系曲线.也给出了不同V值的耦合系数随归一化距离(D/α)的关系曲线.该公式不但能够计算x偏振模的耦合系数,而且也能计算y偏振模的耦合系数.它可用于分析折射率差较大的光纤之间能量耦合以及耦合器的偏振特性. 相似文献
3.
jj耦合下二价原子精细结构能级的一般表达式 总被引:3,自引:2,他引:1
利用表象变换理论以及由拉卡代数方法计算双电子组态LS谱项能量的结果,导出了j耦合下二价原子精细结构能级的一般表达式 相似文献
4.
用光线矩阵方法推导了光纤-自聚焦棒-反射器在共轴耦合情况下的后向耦合系数;分析了它与耦合系统结构参数之间的关系.用计算机模拟画出了反射器为平面镜的系统的后向耦合系数和后向耦合损耗的曲线分布,计算曲线与实验结果大致符合. 相似文献
5.
6.
This work focuses on the characteristics of the Rayleigh-Taylor Instability (RTI) of the interfaces formed by two semi-infinitely distributed fluids and one interlayer. In consideration of the coupling effects between the interfaces, the expression of the growth rate is obtained. The result reveals that the instability growth rate depends on the density and thickness of the interlayer. It is found that /f the interlayer thickness is less than 0.6 times of the disturbing wavelength, the coupling effects should be considered. 相似文献
7.
以两个光学电子的原子的sp和p^2组态为例,分析了由于电子自旋-轨道磁相互作用相对于静电相互作用的增强而导致原子状态的角动量从LS耦合过渡到jj耦合。 相似文献
8.
The emission spectrum of a two-level atom interacting with a single mode radiation field in the case of periodic oscillation coupling coefficient is investigated.A general expression for the emission spectrum is derived.The numerical results for the initial field in pure number stare are calculated.It is found that the effect of the coupling coefficient modulation on the spectral structure is very obvious in the case of a low modulation frequency and larger amplitude when the initial field is vacuum,which is potentially useful for exploring a modulated light source. 相似文献
9.
WUNing RUANTu-Nan 《理论物理通讯》2001,35(6):693-696
Relations between helicity coupling amplitude and L-S coupling amplitude are discussed.The equivalence condition for these two kinematic analysis methods and the limitations of the L-S coupling amplitude are also studied in this paper. 相似文献
10.
利用耦合模理论对非平行波导耦合特性进行了研究,得到了非平行波导的普遍性耦合方程及耦合系数表达式.进一步采用小角度近似,给出了几种情况下的计算结果,并与目前报道的利用其他方法计算的结果做了比较.研究表明,不同方法得到的波导中光功率虽然在远距离处都趋于稳定不变,但稳定功率的大小有明显的差别;另外由新提出方法得到的近距离处光功率随着传输距离的起伏变化更为明显.由于该方法同时考虑了非平行波导中光场相位和振幅对耦合方程和耦合系数的影响,因而所得结果能更全面地反映非平行波导的耦合特性,对实际应用更有意义.
关键词:
非平行波导
耦合方程
耦合系数 相似文献
11.
在长距离无线光通信中,接收点光功率密度与光束发散角平方呈反比关系,为了获得小的发散角和大的功率耦合效率,要求准直系统有较大的数值孔径(NA),但数值孔径过大会增加像差,因此合理设计功率耦合效率与准直系统的数值孔径就非常重要。该文对半导体激光器光束准直系统中功率耦合效率进行了研究,给出了半导体激光器光束功率耦合效率与k(孔径半径与孔径处等效光束半径之比)的关系表达式,并结合激光器光束准直系统,给出了半导体激光器光束功率耦合效率与准直系统数值孔径的关系表达式。该研究结论对于半导体激光器光束准直系统设计具有参考作用。 相似文献
12.
A. Waksberg 《International Journal of Infrared and Millimeter Waves》2002,23(9):1327-1335
Coupling losses have been calculated for laser resonators with unequal apertures and extended Fresnel Numbers. This was done using both, diffraction theory and a simple linear model.A close form expression was derived to calculate coupling losses with reasonable accuracies for a limited range of paramters. This should help in the preliminary design of hole coupling laser resonators. 相似文献
13.
The emission spectrum of a two-level atom interacting with a single mode radiation field in the case of periodic oscillation coupling coefficient is investigated. A general expression for the emission spectrum is derived. The numerical results for the initial field in pure number stare are calculated. It is found that the effect of the coupling coefficient modulation on the spectral structure is very obvious in the case of a low modulation frequency and larger amplitude when the initial field is vacuum, which is potentially useful for exploring a modulated light source. 相似文献
14.
15.
The mutual coupling between neurons in a realistic neuronal system is much complex, and a two-layer neuronal network is designed to investigate the transition of electric activities of neurons. The Hindmarsh-Rose neuron model is used to describe the local dynamics of each neuron, and neurons in the two-layer networks are coupled in dislocated type. The coupling intensity between two-layer networks, and the coupling ratio (Pro), which defines the percentage involved in the coupling in each layer, are changed to observe the synchronization transition of collective behaviors in the two-layer networks. It is found that the two-layer networks of neurons becomes synchronized with increasing the coupling intensity and coupling ratio (Pro) beyond certain thresholds. An ordered wave in the first layer is useful to wake up the rest state in the second layer, or suppress the spatiotemporal state in the second layer under coupling by generating target wave or spiral waves. And the scheme of dislocation coupling can be used to suppress spatiotemporal chaos and excite quiescent neurons. 相似文献
16.
The magnetic properties of Fe/Zn/Fe trilayers have been studied by ferromagnetic resonance and magnetization measurements. These measurements have been used to investigate the magnetic anisotropy of the iron layers and the magnetic coupling across the semiconductor spacer. The angular dependence of the resonance spectra has been measured in-plane and out-of-plane in order to deduce magnetic anisotropy constants of the samples. Experimental data were fitted by using an energy-density expression that includes bulk cubic anisotropy, growth-induced uniaxial in-plane anisotropy and perpendicular-surface anisotropy terms. A small ferromagnetic coupling is observed in the trilayers with spacer thickness up to
. 相似文献
17.
热效应对光折变晶体两波耦合的特性影响的理论分析 总被引:3,自引:1,他引:2
用一种模型对两波耦合进行了分析,导出了强度相位的解析式,对影响两波耦合的参数进行了理论分析。分析了对BaTiO3光折变晶体的两波耦合的测量结果。 相似文献
18.
19.
以悬细线拉拽小重物作为等效耦合弹簧,可实现2个一维单摆之间的耦合.通过改变重物的质量或细线的长度,实现等效耦合弹簧的劲度系数的改变. 相似文献
20.
By means of the coupled mode theory and transfer matrix technique, a method is presented for analyzing the bending coupling
between straight and bent rectangular waveguides, or between two bent rectangular waveguides. Calculations show that an effective
coupling region exists around the central coupling point, in which the bending coupling appears, beyond which the bending
coupling is very weak, and the propagation power in each waveguide becomes constant. When the bending radius becomes larger
or the central coupling gap becomes smaller, this effective coupling region becomes wider, in which the coupling behavior
becomes stronger. 相似文献