垂直沟道器件的研究与进展

介绍了垂直沟道器件的常见结构和工艺，分析了垂直沟道器件的最新进展以及垂直沟道器件制作工艺中的最新技术，详细讨论了垂直沟道器件的性能，并分析了垂直沟道器件的优点以及存在的问题。     

光纤器件回波损耗测量系统分析

介绍了各种光纤器件（光无源器件、有源器件、光纤集成器件等）回波损耗的测量原理和测量方法。提出了一些关键技术的解决方法和试验方案。对各种不确定因素进行了分析和试验验证，最终建立了一套光纤器件回波损耗测量装置。     

微波功率器件及其材料的发展和应用前景

介绍了微波功率器件的发展和前景,对HBT,MESFET和HEMT微波功率器件材料的特点和选取,以及器件的特性和设计做了分类说明.着重介绍了SiGe合金、InPSiC、GaN等新型微波功率器件材料.并对目前各种器件的最新进展和我国微波功率器件的研制现状及与国外的差距做了概述与展望.     

基片集成波导技术的研究现状和展望

综述了基片集成波导(SIW)技术研究的现状和热点,首先分析了SIW的基本理论,包括SIW结构设计、损耗机制和频带宽度等;然后详细分析了基于SIW的微波和毫米波器件,包括无源器件、有源器件、天线和可调谐器件;接着对基于SIW技术的器件模拟和制作进行了详细论述;最后对SIW技术应用于太赫兹器件的设计进行了展望.     

采用半背沟注入提高PDSOI nMOSFETs的热载流子可靠性

提出了一个提高PDSOI nMOSFETs可靠性的方法,并且研究了这种器件的热载流子可靠性.这种方法是在制造器件中,进行背沟道注入时只注入背沟道一半的区域.应力试验结果表明这种新的器件和常规器件相比,展示了较低的热载流子退变.2D器件模拟表明在漏端降低的峰值电场有助于这种器件提高的热载流子可靠性.     

无机全固态电致变色器件研究进展

电致变色是一种在外加电场下材料光学属性可变的现象。本文围绕全固态电致变色器件,阐述了器件中每一层的结构、可选材料、性能等,并根据全固态电致变色器件近期的研究进展,总结了两种全固态器件的典型结构,详细介绍了两类器件结构的结构特点、制备方法和电致变色性能,并展望了未来全固态电致变色器件的发展方向。     

可编程模拟器件原理与开发

本文介绍了可编程模拟器件的基本原理和开发流程,列举了主流器件系列,并说明其核心技术,展望了可编程模拟器件的发展前景。     

航天磁性器件失效分析与筛选试验

磁性器件在航天产品中广泛,尤其在电源系统中,起着关键的作用。基于美国航天磁性器件的失效统计数据,分析了磁性器件的主要失效原因。又对国内航天磁性器件的失效进行了初步的统计和分析。通过对比美国和国内航天磁性器件由设计、生产和使用中发生的失效对比,给出了发生失效的主要原因。为了保证磁性器件的质量和可靠性,提出在参考美军标和国军标的基础上,实施国内航天磁性器件筛选试验的建议。     

酞菁铜（CuPc）薄膜器件的制备及其电双稳特性

一些无机半导体器件和许多有机薄膜器件都具有电双稳特性.通过对CuPc有机薄膜器件的,I-V曲线的分析,说明CuPc薄膜器件具有明显的电双稳特性.研究了膜厚对器件I-V特性的影响,结果表明CuPc膜厚达到750 nm器件才表现出明显的电双稳特性,此时跳变电压为7.51V.Ag底电极器件的转变电压(9.6V)与ITO底电极器件的转变电压(7.47V)不同,简要分析了造成这种区别的原因.并对器件电双稳态特性的形成机理进行了解释.     

SOI在高压器件中的应用

综述了绝缘层上的硅(SOI)材料在高压器件中的应用,分析了SOI高压器件的不同结构,并对现在最常用的RESURF LDMOS高压器件结构,以及不同器件参数对击穿电压的影响进行了分析和讨论.     

Fibre bragg gratings optical sensing technology

Fibre optic technology is a well established field in the world of smart structures. While optical communications systems date back as far as the late 1700s when the French engineer Claude Chappe invented the ‘optical telegraph’, advances in optical fibres did not really take off until Corning Glass Works (now Corning, Inc.) developed single-mode fibres with attenuation below 20 dB/km in 1970¹. Now fibre optics are widely used in the telecommunications industry. This breakthrough also led the way for the development of fibre optic sensors. While there are many types of optical sensors, the focus of this article is on the fibre Bragg grating sensor. In-line fibre Bragg gratings (FBGs) were developed as narrow band optical filters for the telecommunications industry². Television commercials by the major telephone companies describe the capability of transmitting as many as 16 telephone calls on the same optical fibre link, a capability made possible with wavelength division multiplexing using Bragg grating or equivalent spectral filtering technology. This intrinsic multiplexing capability and their sensitivity to thermo-mechanical loads also render in-fibre Bragg gratings one of the most promising distributed sensor technologies for structural systems. There are many other applications of FBGs including shape, moisture and corrosion sensing.     

光纤光栅应变传感器监测复合材料层板疲劳过程

采用光纤光栅 (FBGs) 作为疲劳计监测了复合材料层板在等应力幅疲劳测试过程中的应变变化,该变化反映了复合材料在疲劳过程中刚度的衰减规律。试验结果验证了FBGs传感器的疲劳监测能力。FBGs不仅能够埋入复合材料中反映材料疲劳过程中的刚度衰减,而且具有良好的耐久性与稳定性,在经过高达106次循环周次后,依然保持良好的传感能力。FBGs作为一种有效的手段和工具,为复合材料服役过程中的损伤监测、寿命评估以及材料破坏失效阶段的预警提供了可能。     

Surface-relief fiber Bragg gratings for sensing applications

We present a new type of fiber Bragg grating (FBG) in which we etch the grating into the flat surface of a D-shaped optical fiber. Instead of being written in the core of the fiber, as are standard FBGs, these surface-relief FBGs are placed in the cladding above the core. These gratings are a viable alternative to standard FBGs for sensing applications. We describe the fabrication process for etching Bragg gratings into the surface of D-fibers and demonstrate their performance as temperature sensors.     

Uniformly thinned optical fibers produced via HF etching with spectral and microscopic verification

A method for producing uniformly thinned (etched) optical fibers is described, which can also be employed to etch optical fibers containing a Bragg grating (FBG) uniformly for evanescent-field-based sensing and other applications. Through a simple modification of this method, the fabrication of phase-shifted FBGs based on uneven etching is also shown. The critical role of how a fiber is secured is shown, and the success of the method is illustrated, by differential interference contrast microscopy images of uniformly etched FBGs. An etched FBG sensor for the monitoring of the refractive index of different glycerin solutions is demonstrated.     

Switchable dual-wavelength fiber laser mode-locked by carbon nanotubes

We have proposed a switchable mode-locked fiber laser by means of carbon nanotube saturable absorber and fiber Bragg gratings (FBGs). The single-wavelength mode-locking operation can be switched between 1549.5 and 1559.5 nm, respectively, which correspond to the central wavelengths of two FBGs. With the appropriate setting of polarization controller, the stable dual-wavelength operation can be achieved due to the high stability of saturable absorber based on carbon nanotubes. Our method provides a simple, stable, low-cost, dual-wavelength ultrafast-pulsed source.     

Clock stability characterization and measurement intelecommunications

Clock stability characterization and measurement for telecommunications pose peculiar issues and requirements. This paper aims to provide an overview on this subject. After briefly recalling the background work, the key features and issues of clock stability characterization and measurement in telecommunications are described. The timing signal reference model and the stability quantities adopted in the new international standards are introduced and the impact of the measurement configuration and of the time error sampling period on their behavior are elucidated. The measurement of clock stability in telecommunications is then addressed, and a standard practical measurement procedure is outlined. Several measurement results are provided to support the concepts expounded with experimental evidence. The results shown have been chosen among those obtained throughout the last three years by testing clerks of digital switching exchanges, clocks for synchronous digital hierarchy (SDH) equipment, and state-of-the-art stand-alone slave clocks for synchronization networks. They thus represent a survey of the actual performance of clocks currently deployed in telecommunications networks     

Single-pulse fiber Bragg gratings and specific coatings for use at elevated temperatures

The technique of recording fiber Bragg gratings (FBGs) with single exposure pulses during the fiber drawing process allows production of such gratings in complex array structures, with high mechanical strength of the fiber and in a simple and cost-efficient way. This is of special interest for the growing field of fiber sensor applications with FBGs. A general advantage of fiber sensor systems is their ability to be used also at elevated temperatures compared with conventional electric or electronic sensors. For this purpose, the fiber itself as well as the grating structure and the fiber coating should be stable under such elevated temperature conditions. We have investigated different coating materials and possibilities of making temperature-stable FBGs of types I and II in the range of 100 degrees C-1000 degrees C with good reflection efficiency by single-pulse exposure during the fiber drawing process.     

Fiber Bragg grating in large-mode-area fiber for high power fiber laser applications

Fiber Bragg gratings (FBGs) are indispensable components in the design of monolithic high-power fiber lasers. As the laser power scales up, the adoption of larger-mode-area fibers with high V numbers poses new challenges for FBG design and fabrication. In this paper, we present the simulation, fabrication, and measurement of the FBGs inscribed on large-mode-area fibers. The simulation used the T-matrix approach to calculate the spectral response of the FBG that matched well with the measured spectra. The observed fringes in the reflection spectrum are explained by the interference between the low-order modes that were also confirmed with the simulation. Some unique features of the FBG and their potential applications are discussed.     

Study on the quality of interference fringes from a pulsed UV source for application in a biprism based fiber Bragg grating writing

This paper presents a study on the quality of interference fringes formed from a pulsed UV (255 nm, 5.6 kHz, and 40 ns) source for an application in writing fiber Bragg gratings (FBGs). The interference fringes of separation of about 8 microm, formed by a biprism of apex angle 2 degrees , were studied for their contrast, evolution of contrast, and positional and intensity stability over a period of 5 min (over 10(6) pulses). Second harmonic UV (255 nm) sources of different spatial coherence and pointing stability characteristics were employed as the inputs. It is established that the UV fringes contrast and interference pattern stability with time is largely controlled by the optical resonator geometry of the fundamental wavelength (510 nm) copper vapor laser (CVL) oscillator. In particular, the generalized diffraction filtered resonator (GDFR) CVL produced the highest quality second harmonic beam with the highest fringes contrast and stability. The implications of these results were studied by employing these UV sources for the fabrication of the C-band FBGs by a 24 degrees apex angle biprism.     

Intensity demodulation-based acoustic sensor using dual fiber Bragg gratings and a titanium film

We report on recent experimental results obtained with fiber Bragg grating (FBG) microphone for acoustic measurement. The sensing element is formed by longitudinally sticking ends of two FBGs onto a titanium film, and then being packaged in an aluminum cylinder. Due to wavelength shift of the FBGs induced by the external acoustic disturbance, the corresponding periodic fluctuation in power can be observed on the optical oscilloscope. Theoretical analysis verifies that the optical power variation, result of the titanium film vibration caused by the acoustic disturbance, possesses a linear relationship with the sound pressure in a specific range. A relatively flat frequency response in the range from 100?Hz to 1?kHz with the average signal-to-noise ratio (SNR) above 22?dB is experimentally demonstrated. The maximum sound pressure sensitivity of the proposed sensor is found to be 90?μW/Pa within a sound pressure range 100.3–118.5?dB. The sensing system presents good stability and reliability, and has the advantage of direct self-demodulation.