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1.
N × N集成光开关阵列模型 总被引:9,自引:8,他引:1
报道了由2N个1 × N 多模干涉马赫-曾德尔光开关组成的N × N光开关阵列结构,分析了这种结构的开关阵列优势和局限性.用场传输矩阵方法建立了1 × N多模干涉光开关的光场传输方程.给出了光开关阵列从任一输入端输入、从任一输出端输出时阵列开关的工作条件.在上述原理及理论基础上分析了4×4光开关阵列的结构和工作条件. 相似文献
2.
本文报道1×N多通道声光偏转选址开关的研究.由 Ti 扩散 LiNbO3波导上两个短程透镜和一个倾斜 chirp 叉指换能器构成的集成光学声光偏转器,在两端分别对接一根和N根单模光纤时,用作多通道选址开关,在换能器带宽为200MHz,对1.3μm波长,可实现N=24;带宽增加到500MHz,可达到N=64,在波长为0.633μm的 He-Ne 激光下进行的实验和理论符合. 相似文献
3.
多层"台阶"近似方法是将平板波导中折射率随厚度变化的曲线近似地用N层台阶形的折线来代替,使每一个小区域内折射率成为常数,由此得到电磁场分布和传播常数.本文从理论上给出了层数N与计算精度之间的关系.推导出在分割成N层和2N层两种近似下的计算值精度的改进.本文结果适用于任何渐变折射率平板光波导. 相似文献
4.
对二维介质柱光子晶体耦合腔波导慢光结构进行了研究,发现随着缺陷腔之间晶格个数增多,群速度减小很快,选用7×7超胞单元时耦合腔波导结构的导模最大群速度νg-max只有光子晶体线缺陷波导的1/251.然后对7×7超胞单元的缺陷腔周围四个介质柱半径进行调整,发现新型结构导模的νg-max进一步减小,最小可达到589×10-4c,约为未调整之前的1/5.最后通过比较发现,当改变缺陷腔上下相邻两个介质柱半径时得到的结构具有更好的慢光特性. 相似文献
5.
本文采用第一性原理框架下的赝势平面波方法结合振动类德拜模型研究了α,β和γ-Si3N4在高温下的点阵常数,弹性常数和弹性模量.研究发现三种同质异相体的体模量都很高.β-Si3N4在低温下表现出脆性,在高温下则表现出延展性.γ-Si3N4在低温和高温下都是脆性的共价化合物.β → γ 相变的相界斜率为正值,说明在较高温度时合成γ-Si3N4所需的压强也较高.α → γ 相变的相界可以表示成 P=16.29- 1.835-10-2 T+9.33945-10-5T2-2.16759-10-7T3+2.91795-10-10T4.本文还分析了Si3N4同质异相体在高压下的态密度和能带.在α-Si3N4中主要是Si-s, p和N-s,p的轨道杂化对晶体的稳定性起作用.α和β-Si3N4都具有ΓV-ΓC类型的间接带隙(分别是4.9~eV和4.4~eV)而γ-Si3N4具有直接带隙(3.9~eV). 研究还发现α-Si3N4和β-Si3N4的价带顶分别沿着Γ-M和Γ-A方向.本文的计算结果和已有的实验数据是一致的. 相似文献
6.
PT-PEK-c电光聚合物薄膜的厚度和介电性质 总被引:2,自引:0,他引:2
研制了新的PT-PEK-c电光聚合物薄膜材料,用准波导耦合m线方法测量了PT-PEK-c电光聚合物薄膜的厚度,并测量了该聚合物薄膜在1×102Hz到1×107Hz频率范围内的室温介电常数.测量结果为:厚度d=2.328±0.315μm,在10KHz下,介电常数εr=4023±0.063,介电损耗tanδ=0.003. 相似文献
7.
两种特殊四态叠加多模叠加态光场的等N次幂H压缩 总被引:3,自引:0,他引:3
根据线性叠加原理,用多模相干态|{Zj*}〉q,|{-Zj*}〉q及其复共轭|{Zj*}〉q和|{-Zj*}〉q组成了两种四态叠加多模叠加态光场|Ψoe(4)Ⅵ〉q和|Ψ(4)oeⅦ〉q,利用多模压缩态理论研究了它们的等N次幂H压缩,结果发现:态|Ψoe(4)Ⅵ〉q和|Ψ(4)oeⅦ〉q具有完全相同的等N次幂H压缩规律;当压缩幂次N与腔模总数q之积,即qN为偶数时,态|Ψoe(4)Ⅵ〉q和|Ψ(4)oeⅦ〉q恒处于等幂次N-H最小测不准态或呈现"半相干态效应";当qN为奇数时,在不同条件下,态|Ψoe(4)Ⅵ〉q和|Ψ(4)oeⅦ〉q可以呈现三种不同状态:第一正交分量呈现等N次幂H压缩;第二正交分量呈现等N次幂H压缩; 可呈现"半相干态效应". 相似文献
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10.
多模辐射场的广义非线性不等阶高阶压缩的一般理论 总被引:168,自引:61,他引:107
本文建立了多模辐射场的广义非线性不等阶高阶压缩的一般理论。首次提出了多模辐射场中各模压缩阶数不相等的Nj次方Y压缩、Nj次方H压缩以及Nj次方X压缩的一般性定义,并对Nj-Y最小测不准态、Nj-Y压缩最小测不准态、Nj-H最小测不准态、Nj-H压缩最小测不准态以及Nj-X最小测不准态和Nj-X压缩最小测不准态等进行了详细讨论。指出,Zhang等人在国际上提出的有关单模辐射场的振幅N次方压缩的定义、Mark Hilery在国际上提出的有关双模辐射场的“双模和压缩”与“双模差压缩”的定义以及由笔者新近提出的有关多模辐射场的N次方Y压缩、N次方H压缩和N次方X压缩等的定义,仅仅只是本文所提出的Nj次方Y压缩、Nj次方H压缩以及Nj次方X压缩等的一般性定义在各种不同条件下的特例. 相似文献
11.
Kwang Taek Kim Boo Jeon Han Min Kuk Kim Young Ho Kim Byeong Ha Lee Kyung Jae Cho 《Fiber and Integrated Optics》2013,32(4):265-277
Abstract Two types of 4 × 4 plastic optical fiber star couplers incorporated with a polymer waveguide as the optical power distributor are proposed, and their high performances are demonstrated. The characteristics of the proposed star coupler are investigated based on ray optics, and its power distribution performance is evaluated in terms of the flatness of the coupling ratio and the amount of the excess loss. Under the best conditions, the flatness of the coupling ratio and the excess loss of the fabricated device have been obtained as 2.0 dB and 2.5 dB, respectively. 相似文献
12.
A multiplexed white light interferometric fiber optic sensors matrix system was designed and demonstrated. In this system, a Mach–Zehnder optical path interrogating technique is used to demodulate each sensor of the sensors matrix. The sensors matrix consists of M×N sensing elements linked by a 1×M star coupler. The multiplexing capacity of the sensing scheme has been analyzed and an experimental result with a 2×2 sensors matrix was presented. 相似文献
13.
YAW-DONG WU 《Fiber and Integrated Optics》2013,32(5):387-404
We propose a new nonlinear all-optical switching device by using the spatial solitons collision. This is 1 × N switching device controlled by two control beams. The numerical results show that this device could really function as a 1 × N all-optical switching device. This device is a potential key component in the application of optical signal processing and optical computing systems. 相似文献
14.
Pt/W/Cr/SiC Schottky-barrier diodes that retain good electrophysical parameters up to 450°C are studied. With the Auger electron spectroscopy (AES) method, it is shown that the thermal stability is provided by using a multilayer metal composition that ensures the metal/SiC interface stability. The surface-barrier structures obtained are tested for radiation hardness. They are irradiated by fast neutrons with a fluence of 4.42×1015 n/cm2 and attendant γ radiation with a dose of 8.67×105 R in the concentration range of N d-N a=1016−5×1017 cm−3. Irreversible modifications of the structures at N d-N a≤8×1016 cm−3 are found. The degradation of the parameters is inversely proportional to the doping level. 相似文献
15.
Abstract The technology of fiber-optic couplers based on fused biconical tapered structures is reviewed, and the linear and star data-bus configurations that can be constructed using these couplers are discussed. A useful network topology for interconnecting star couplers using the hybrid transmission-reflection star coupler is also proposed. This network configuration has the advantage of requiring significantly less optical fiber than networks employing a single transmission or reflection star. 相似文献
16.
We consider the Riemann–Hilbert method for initial problem of the vector Gerdjikov–Ivanov equation, and obtain the formula for its N-soliton solution, which is expressed as a ratio of (N + 1) × (N + 1) determinant and N × N determinant. Furthermore, by applying asymptotic analysis, the simple elastic interactions of N-soliton are confirmed, and the shifts of phase and position are also explicitly displayed. 相似文献
17.
V. M. Kotov 《Technical Physics》1997,42(7):769-774
Planar acoustooptic 2×2 directional couplers that switch optical rays with different wavelengths are considered. A method
for calculating the angular and frequency characteristics of such switches is developed, and the parameters of a switch based
on a planar Ti-LiNbO3 structure are calculated. Experiments employing bulk acoustooptic diffraction in TeO2 are performed, confirming the basic theoretical assumptions. It is shown experimentally that the best conditions for switching
optical rays directed into optical fibers can be provided nearly always by varying the diffraction angles and the frequencies
of the sound waves. The functional possibilities of the 2×2 directional coupler investigated in a fiber-optic gyroscope are
described.
Zh. Tekh. Fiz. 67, 57–62 (July 1997) 相似文献
18.
研究了15 MW峰值功率脉冲激光与600 μm芯径石英光纤耦合中存在的空气击穿现象。对聚焦区域的空气击穿现象进行了理论和实验研究,测得空气击穿阈值为0.79×109 W/cm2。测得固体介质的激光损伤阈值为2.12×109 W/cm2,与理论计算结果相符。提出了七合一光纤耦合器用于解决空气击穿的办法,实验测得7根光纤并束的耦合效率为67.21%。结果表明光纤耦合器可有效解决15 MW峰值功率脉冲激光与600 μm芯径石英光纤的耦合。 相似文献
19.
设计了一种中红外硫系玻璃双芯光子晶体光纤,利用多极法和模式耦合基本理论研究了这种光纤的耦合特性.数值模拟发现,空气孔间距Λ = 5.4 μm,空气孔半径为r = 1.35 μm,空气填充率d/Λ = 0.5的光纤,在归一化波长λ/Λ = 2.04 μm处双折射可以达到0.551×10-2,在归一化波长λ/Λ = 0.93 μm处x偏振方向的耦合长度为145.32 μm,y偏振方向的耦合长
关键词:
双芯光子晶体光纤
硫系玻璃
双折射
耦合长度 相似文献
20.
In this article we propose two kinds of new fiber ring structure with a semiconductor optical amplifier. The first structure is a one-fiber-ring amplifier with an 8 × 8 fiber coupler and a semiconductor optical amplifier (SOA). The second fiber ring structure is a two-fiber-ring laser including an 8 × 8 fiber coupler, a 2 × 2 E/O modulator, and an SOA. The 14-output spectra of the fiber laser are measured. The gain coefficients of each port of the multiple-output-fiber-ring amplifiers are also measured. We apply these two kinds of fiber ring structures in a hybrid CATV and ADSL broadcasting optical fiber communication system. This application can develop a broadcasting system with large coverage area without using many laser diodes and optical amplifiers. The performance of such a system is also analyzed in this article. 相似文献