A Microwave Photonic Notch Filter Using a Microfiber Ring Resonator

A novel tunable microwave photonic filter based on a microfiber ring resonator is proposed and experimentally demonstrated. A fiber ring laser based on the microfiber ring resonator is employed to generate two singlelongitudinal-mode carriers, then the dispersive element introduces the delay between two modulated carriers. By adjusting the diameter of the microfiber ring resonator, the proposed microwave photonic notch filter can be continuously and widely tuned. The measured notch rejection ratio is greater than 35 dB, and there is good agreement between the experimental result and the theoretical analysis.     

以电阻测量为例谈师范生的普通物理实验设计

以电阻测量为例,介绍如何设计普通物理实验内容,使师范生受到物理实验的基本功、语言和文字表达等训练,培养物理师范生能够针对中学物理教学特点,设计中学物理实验,撰写实验讲义,指导中学生实验的能力。     

A Proposal and Demonstration for Photonic Generation of a Microwave Signal by Incorporating a Microring Resonator

A proposal for photonic generation of a microwave signal is presented by employing a dual wavelength erbiumdoped fibre ring laser. In the laser, a microring resonator is cascaded with a tunable bandpass filter to serve as a dual-wavelength selector, an unpumped polarization maintaining erbium-doped fibre is used as a saturable absorber. By replacing the microring resonator with a delay interferometer to verify the proposal, a wavelengthtunable dual wavelength single longitudinal mode laser is demonstrated, and a microwave signal at 10.01 GHz with a linewidth of less than 25 kHz is obtained by beating the two wavelengths at a photodetector.     

Theoretical Study on Negative Parity States of^（191,193,195,197） Au in Particle Triaxial-Rotor Model

By taking the particle triaxial-rotor model with variable moment of inertia, we investigate the energy spectra, the deformation and the single particle configuration of the negative-parity states in nuclei^（191,193,194,197） Au systemically. The calculated energy spectra agree well with experimental data. The obtained results indicate that the negative-parity states in^（191,193,195,197）Au originate from the proton-hole h11/2 configuration coupled to a triaxial oblate Hg core. Meanwhile the main single particle configuration of the bands 1, 2 and 3 are identified to be [5h11/2 1/2） （α=-1/2）, [5h11/2 1/2） （α = 1/2） and 15h9/2 7/2）, respectively.     

智能弗兰克-赫兹实验测量仪的研制

采用AT90S 8535单片机研制了一种智能弗兰克－赫兹实验测量仪，能测量10^-9-10^-12A微电流，提供0－50V线性程控稳压电源，模糊控温，图形液晶显示中英和曲线，曲线数据打印，具有测量快、精度高、体积小、成本低、使用方便等优点。本介绍了该测量仪的硬件组成、典型电路工作原理、软件设计，分析了实验结果。     

基于单片机多谱勒效应实验仪的设计

介绍了用单片机设计多谱勒效应实验仪的电路组成和典型电路,电路简洁,操作方便,成本低,教学效果好。     

LabVIEW在物理设计性实验中应用的探讨

介绍了LabVIEW的优势,探讨了LabVIEW在物理设计性实验中的应用,并通过具体示例详细说明.     

LabVlEW在物理设计性实验中应用的探讨

介绍了LabVIEW的优势，探讨了LabVIEW在物理设计性实验中的应用，并通过具体示例详细说明。     

强脉冲信号在光纤参变放大器中的放大特性研究

考虑到抽运损耗、走离、色散和非线性等效应,用分步傅里叶方法求解耦合的非线性薛定谔方程组,就强脉冲信号在连续光抽运光纤参变放大器中的放大情况进行了理论研究。研究结果表明,强脉冲信号除经历振幅放大,脉冲时域展宽等过程外,还会发生令人感兴趣的脉冲分裂现象,即一个脉冲信号分裂为两个子脉冲。而且即使在连续光抽运的情况下,走离效应对强脉冲信号的放大也产生了显著影响,即促使两个子脉冲振幅不等以及脉冲漂移。最后,强脉冲信号独特的放大特性用光纤参变放大器的饱和增益特性做了很好的解释,并指出脉冲分裂现象在信号抽样、脉冲压缩、光时分复用系统中有潜在用途。