垂直不均匀磁场中静磁波的传播特性

本文理论分析了垂直不均匀磁场作用下磁性薄膜中静磁波的传播特性,具体计算了抛物线分布的不均匀磁场对静磁对表镣波振幅的影响,计算表明,在适当分布的不均匀场作用下,与均匀磁场情形相比,波导中传播的 振幅有所增加,从而也增强了静民导波光相互作用时的射效应。     

静磁正向体波与导波光的非共线相互作用

在考虑静磁正向体波（MSFVW）传播损耗及微带换能器耦合损耗的情况下，利用耦合模理论推导出导波光（GOW）衍射效率的表达式，并针对掺铋钆铁石榴石（Bi-YIG)薄膜波导和钇铁石榴石（YIG）波导计算了GOW衍射效率的频率响应曲线。数值计算表明，虽然MSFVW在Bi-YIG薄膜中的传播损耗大于YIG薄膜，但前者具有很大的一级磁光系数，故Bi-YIG波导中GOW的衍射效率仍远大于YIG波导。     

基于磁调谐光纤Bragg光栅的全光纤型多路分/插复用器

提出了一种新型的用作多信道切换的光分／插复用器,它由多个可调谐光纤Ｂｒａｇｇ光栅、一对光纤环行器、ＷＤＭ复用器和解复用器构成。讨论了该分／插复用器的结构、性能和特点。利用磁极间磁场力使光纤光栅产生显著的波称偏移。用可编程磁极来调控光栅的波长偏移。其信道波长调谐速度快,装置无需外加能源即可保护信道波长的偏移。     

磁光光纤Bragg光栅中偏振消光比特性分析

通过分析磁光光纤Bragg光栅中偏振消光比特性,提出一种利用峰值偏振消光比测量磁场的新方案。利用OptiSystem软件仿真表明,当光栅耦合系数远大于磁光耦合参量时,峰值偏振消光比与外加磁场的对数值成线性关系,与理论分析结果一致。文章还给出了峰值消光比与光栅长度、折射率调制深度和费尔德常数之间关系的解析式,可方便地用于分析磁场的测量性能。     

外加偏置磁场对静磁波模式及其频带的影响

本文完整地展现了磁光薄膜中任意倾斜的外加直流偏置磁场对微波静磁波激发模式及其带宽的影响,实现了对不同静磁模的统一考虑,为进一步分析磁光Bragg器件的衍射性能提供理论基础.计算分析表明:(1)当外加偏置磁场的大小不变时,传统磁化情形下的静磁波带宽最大,此时基于MSBVW的磁光Bragg器件较相应的MSFVW器件有更高的工作频率;(2)在适当倾斜的偏置磁场作用下,静磁反向体波(MSBVW)、静磁正向体波(MSFVW)和静磁表面波(MSSW)均可被激发,它们的激发频率依次增大;(3)通过倾斜偏置磁场可使MSFVW的频带向高频移动.     

磁致伸缩调制型光纤Bragg光栅的温度补偿方法

提出了两种简单的磁致伸缩调制型光纤Bragg光栅的温度补偿方法。利用磁场和磁致伸缩材料对光纤光栅的Bragg波长进行调制 ,将一对光纤光栅按特定的结构固定 ,使得磁致伸缩效应对两只光纤光栅的Bragg波长的调制效果相互叠加而温度的影响相互抵消。补偿后的磁场调制型光纤光栅温度在 2 2～ 80℃的范围内 ,波长变化仅为0 11nm ,其温度灵敏度是温度补偿前的 1 10。     

真空器件的磁屏蔽方法

真空器件在使用过程中必须要进行磁屏蔽。本文介绍了在低频磁场环境条件下所采取的磁屏蔽方法。     

用于高灵敏微磁传感器的LMO膜制备与分析

采用溶胶凝胶法制备了LaMnOx(LMO)薄膜,系统研究了不同烧结温度、纵向直流磁场后退火和生长膜层数对LMO薄膜的巨磁阻抗效应的影响。结果表明,烧结温度、膜的层数以及纵向磁场后退火处理均有效提高了LMO的巨磁阻抗比,其中纵向直流磁场后退火处理提高薄膜阻抗比效果最显著,经过10Oe、400℃恒温1h磁场后退火处理后,在频率5MHz、100Oe外磁场下其磁阻抗比达15.8%,相比未后处理样品磁阻抗比提高了一倍,其对应的磁场灵敏度为0.16%/Oe。同时,实验发现磁场后退火不仅影响薄膜的巨磁阻抗比,也会改变阻抗比极大值所对应的激励频率,这一现象目前仍在探究中。     

一种新型磁光开关的理论分析与磁路设计

介绍了一种新型的磁光开关器件（magneto-optic switch）.重点阐述了磁光晶体旋光的原理和磁光晶体的光学性质,并从理论上分析了磁光晶体的旋光角度和控制磁光效应的螺线管产生的非轴线磁感应强度,并对磁路进行了设计与计算.     

光纤Bragg光栅等强度悬臂梁型称重传感器的标定与不确定度分析

研制了一种等强度悬臂梁结构的光纤Bragg光栅称重传感器.为了确定其称量结果的可靠性,通过分析载荷信息传递过程与光栅敏感元件的感知原理,推演传感器设计的理论依据,设计了采用标准质量块进行标定的静态载荷实验装置,通过MATLAB实现静态传感数据分析,并分析标定过程中存在的不确定因素进而确定了传感器的不确定度指标.实验表明...     

Guided-wave devices for optical communication

We review the current status of guided-wave optical communication devices. The operation and presently demonstrated performance characteristics of waveguides switches, modulators, filters, and polarization transforming devices are discussed. Emphasis is given to recent developments with very high speed modulators and polarization insensitive devices.     

Integrable devices for wavelength multiplexing optical communication systems

Devices for wavelength division multiplexing (wdm) applications become very important in today’s communication systems. Here the operation principle and the main characteristics of some key components in wdm-systems are given. Various types of tunable lasers, wavelength converters and tunable filters are discussed.     

1550-nm volume holography for optical communication devices

The two-lambda method can provide a strategic approach to implement all-optical devices for communication wavelength division multiplexing (WDM) signal processing based on volume holography. By writing holograms at 488 nm in LiNbO/sub 3/:Fe and reading them in the third window of optical communication systems (1550 nm), the feasibility of WDM demultiplexers and holographic memories for digital bytes is here demonstrated.     

光纤通信有源器件的发展现状

光纤通信技术的飞速发展使其成为当今信息社会的重要支柱。其发展的基石是有源和无源半导体光电子器件。综述了几种主要的有源光电子器件的研究现状及其发展趋势,包括高速调制DFB激光器及其集成芯片、EDFA泵浦源用980 nm半导体高功率激光器、化合物半导体光电探测器、硅基长波长光电探测器等。     

LiNbO3 based optical devices for fiber communication

h efficiency wavelength converters.     

Design, tolerance analysis, and fabrication of silicon oxynitridebased planar optical waveguides for communication devices

Planar optical waveguiding structures for application in communication networks are highly demanding with respect to low insertion loss, efficient fiber-to-chip coupling, polarization independent operation, high integration density, reliable fabrication, and last but not least cost efficiency. When applying silicon oxynitride, which is a very versatile material, planar waveguiding structures can be designed having the potential of meeting all those requirements. In this paper, we will describe the design of such a waveguiding structure, demonstrate the practical feasibility of realizing this structure and discuss the preliminary measurement results     

A study of green wavelength-division multiplexed optical communication systems using cascaded fiber bragg grating

This paper studies the performance analysis of wavelength-division multiplexed optical communication systems (WDM). First, flat-gain erbium doped fiber amplifiers (EDFAs) are seriously needed to obtain proper and equal amplification of all channels. Such amplifiers can be designed by intrinsically modifying the host material or extrinsically using proper filters. In this research, we benefit from both the intrinsic and extrinsic methods to achieve sharp flat EDFA output gain using cascaded fiber Bragg gratings (FBGs). Second, the performance of our technique has been evaluated through calculating the bit error rate (BER) and signal-to-noise ratio (SNR) of a WDM system embedded with the reported EDFA flattening system. The parametric simulations of the FWHM of FBGs, SNR, optical power and the transmission distance have shown a noticeable improved performance. Sending data via an optical WDM system will be proven from comprehensive simulations to achieve high quality signal transmission spectrums, increased transmission distances and low power consumption. By extension, the reported design using cascaded FBGs can also be generalized to equalize the gain of any arbitrary profile.     

新型光无源器件概述

简单介绍了光纤通信系统中的光连接器、光耦合器、波分复用器和光开关方面的新型光无源器件。     

微结构光纤--新型光通信媒质

文章介绍了微结构光纤(MOF)的结构、导光机制和设计参数,详细讨论了MOF的几种新奇特性及其在光通信系统中广阔的应用前景,最后展望了我国在微结构光纤领域的研究.