共查询到20条相似文献,搜索用时 109 毫秒
1.
研究了关于自仿集上电荷分布的势论及有关分析性质。指出电荷分布、势及其Fourier变换的构造性质;明确给出了三分Cantor集上二项分布及其矩、Fourier变换、势的具体表达式;并给出一些数值结果。 相似文献
2.
自由空间光学Comega多级互连网络特性研究 总被引:2,自引:2,他引:0
光学Comega网络是一种新颖的易于光学实现的多级光互连网络。本文对该网络结构及特性进行了详细分析,和到了网络的互连函数,并给出了它与Staran,Crossover,Omega,Banyan及基准等常见网络的拓扑等价证明。 相似文献
3.
4.
彩色、黑白CCD摄像机产品报道台湾敏通公司为了广泛推广CCD应用技术,加强海峡两岸的学术交流,该公司在拓展CCD摄像机业务的同时,于1992年10月1日在北京创刊由该公司主办的《敏通科技》杂志,并在海峡两岸同步发送(截止到目前为止已出版发行了9期),... 相似文献
5.
6.
7.
描述了一种基于电寻址空间调制器的二值化联合变换相关器,该系统主要包括阴极射线管耦合液晶光阀(CRT-LCLV)、CCD摄象机和COMPAQ386计算机,文中在理论分析的基础上给出了计算机模拟和初步的实验结果,表明该相关器具有良好的识别性能。 相似文献
8.
CCD在光谱分析系统中的应用研究 总被引:15,自引:3,他引:12
本文对利用CCD作传感器件进行光谱分析的方法进行了理论和实验研究。通过分析CCD的结构特点和光电特性,从理论上证明了利用CCD进行光谱分析的可行性,设计了一套适合线阵CCD的高速图像采集卡,建立了一套智能化光谱数据采集分析系统。该系统主要由光栅、CCD传感器及数据采集卡、计算机等部分组成。我们用高压汞灯作为标准光谱进行定标,得到了一个非常简单的计算光谱的数学公式。实验表明该系统具有较高的测量精度,特别适用于瞬态过程的光谱分析。 相似文献
9.
CC榕树网络及其光学实现 总被引:1,自引:0,他引:1
利用偏振分光棱镜及一维位相型空间光调制器,作者成功地实现了光学CC榕树网络,并给出任意输入输出对间的连接控制方式,它具肥能量损耗低,串扰小,结构紧凑及高通道密度等优点。 相似文献
10.
11.
CompactOpticalOmegaNetwork¥WANGNing;YINYaoal;QIANJiajun;LIULiren(ShanghaiInstituteofOpticsandFineMechanics,AcademiaSinica,P.O... 相似文献
12.
基于异步延迟采样和人工神经网络统计学习提出了一种光通信性能监测方法。通过对高速光信号进行异步延迟采样,获得信号二维幅度直方图,然后提取其中特征参数并对人工神经网络进行训练,最后以人工神经网络的预测输出实现对光信号损伤的监测。构建10 Gb/s非归零码开关键控,40 Gb/s光学双二进制码和归零码差分移相键控光通信仿真系统,并对光信噪比、色散和偏振模色散损伤进行监测。仿真结果表明,所提方法对被监测光信号的速率、码型调制格式透明,可同时准确监测多种并存的传输损伤,损伤参数监测误差小于5%。该方法具有电域处理带宽要求低、采样机制简单的特点,适用于分布式在线光性能监测。 相似文献
13.
We propose and experimentally demonstrate a polarization shift keying label and a vestigial sideband carrier-suppressed return-to-zero payload scheme for a 43 Gbit/s all-optical label switching network. This scheme has a narrow channel bandwidth and a low penalty due to polarization mode dispersion impairments, which confirm it as a candidate technique for the next generation of optical networks. 相似文献
14.
Jianxin Ma Ruijiao Zhang Junjie Zhang Xiangjun Xin 《Fiber and Integrated Optics》2013,32(5-6):217-229
AbstractA novel full duplex fiber wireless link providing alternative wired and 60-GHz wireless access is proposed based on a polarization orthogonal dual-tone optical millimeter-wave signal. In a hybrid optical network unit, the downlink optical signal can be decomposed as a single-sideband optical millimeter-wave signal (baseband optical signal) for wireless (wired) access by a polarization controller and polarization beam splitter. The uplink optical carrier abstracted from the downlink optical signal makes the hybrid optical network unit free from the optical source. The simulation results show that both downlinks and uplinks for either wired or wireless access can maintain quite good performance over 60 km of fiber. 相似文献
15.
Wolfgang E. Ernst 《Optics Communications》1983,46(1):18-22
Complex sub-Doppler spectra can be simplified by the application of microwave modulated polarization spectroscopy (MMPS). This new laser spectroscopy technique is based on a combination of Doppler free laser polarization spectroscopy with microwave optical polarization spectroscopy (MOPS). The method has been used to label particular optical lines in the B2σ-X2σ spectrum of SrF. 相似文献
16.
17.
4×4自由空间光开关结构及其矩阵分析 总被引:10,自引:5,他引:5
光开关是全光通信网络中的一种重要的光无源器件。提出了一种4×4自由空间光开关的结构设计方法,并进行了矩阵理论分析。该4×4光开关具有新颖的光模块化结构,该光开关结构仅由偏振分束组合棱镜,λ/4波片,λ/2波片,直角棱镜,全反镜和偏振光调制器组成,对光开关的控制与输入光束的偏振态无关。所有的输出端口可以和输入端口无阻塞地互连交换。这种新型的光开关结构具有光学元件少,结构紧凑,模块化,与偏振无关的特点。基于4×4光开关的矩阵分析得到了路由控制表,为4×4光开关从任意输人端口到任意输出端口的路由控制状态提供了理论分析手段,从而可以方便地实现无阻塞地光交换开关矩阵的路由控制功能。 相似文献
18.
Anomalous pulse-width narrowing with first-order compensation of polarization mode dispersion 总被引:2,自引:0,他引:2
We present analytical and experimental results to demonstrate the narrowing of pulses transmitted through optical fibers, with polarization mode dispersion compensated for to first order in frequency. The compensation technique splits the optical signal at the fiber output into polarization components that are aligned with the output principal states of polarization, and only one of the two components is subsequently detected. It is shown that it is possible with this compensation technique to have output pulses that are narrower than the input pulses. Pulse narrowing can also be found when the optical signal is split into orthogonal polarization components that are not principal states of polarization. 相似文献
19.
An integrated optical coherent receiver with continuous state of polarization control is proposed and analyzed. The receiver consists of an integrated optical polarization rotator, a state of polarization detector and a balanced mixer receiver. Continuous state of polarization control can be achieved by using two polarization rotators in series and feeding the polarization rotator outputs into the state of polarization detector whose subsequent output is used to control the voltage settings on the polarization rotator. For the general case, the polarization rotator is comprised of two phase shifters and a TE - TM mode converter. The state of polarization detector stage consists of a δβ directional coupler mode splitter. A novel fabrication technique for achieving efficient polarization splitting is discussed. A balanced mixer receiver is implemented using a passive directional coupler with 50/50 power splitting. The need for a passive device is demonstrated and a method for achieving accurate power splitting ratios using the proton exchange fabrication technique is discussed and experimentally demonstrated. An analysis of the performance of such a system including the balanced mixer receiver is carried out to identify the critical areas of fabrication. Discussion is also given to the function and characteristics of the electronic control loop. 相似文献
20.
CC-Banyan network plays an important role in the optical interconnection network. Based on previous reports of (2, 2, 3) the CC-Banyan network, another rectangular-Banyan network, i.e. (3, 3, 2) rectangular CC-Banyan network, has been discussed. First, according to its construction principle, the topological graph and the routing rule of (3, 3, 2) rectangular CC-Banyan network have been proposed. Then, the optically experimental setup of (3, 3, 2) rectangular CC-Banyan network has been designed and achieved. Each stage of node switch consists of phase spatial light modulator (PSLM) and polarizing beam-splitter (PBS), and fiber has been used to perform connection between adjacent stages. PBS features that s-component (perpendicular to the incident plane) of the incident light beam is reflected, and p-component (parallel to the incident plane) passes through it. According to switching logic, under the control of external electrical signals, PSLM functions to control routing paths of the signal beams, i.e. the polarization of each optical signal is rotated or not rotated 90° by a programmable PSLM. Finally, the discussion and analysis show that the experimental setup designed here can realize many functions such as optical signal switch and permutation. It has advantages of large number of input/output-ports, compact in structure, and low energy loss. Hence, the experimental setup can be used in optical communication and optical information processing. 相似文献