光纤线路中菲涅尔反射对传输的影响

文章定量地讨论了光纤线路中存在的菲涅尔反射及其对数字信号传输和模拟信号传输的影响。     

光传输系统的反射损耗测试

本文讨论了在有线电视光传输系统和设备测试中,光反射损耗的测试原理和方法。     

半导体光放大器在传输结构和反射结构中的噪声性能实验研究

半导体光放大器（SOA）在光信号处理中起着非常重要的作用。文章比较研究TSOA传输结构和反射结构的不同噪声特性。实验表明,SOA的反射结构与传输结构有着不同的噪声特性,特别是当SOAT作在饱和状态时,SOA对反射信号噪声进行二次抑制,输出噪声特性得到明显改善。     

华为光传输设备综述

从产业整体看,光传输是我国与世界一流水平距离最近的领域之一,应用与技术实力进入了世界先进行列。华为公司凭借其从事光网络研究开发的丰富经验,在光传输核心技术和高端产品上不断地实现突破,如已经商用的10GSDH、16／32波DWDM系统以及即将推出的80波、160波DWDM系统和OXC设备,并凭借其光传送网的系列产品和演进策略为下一代光网络的构筑做准备。     

WDM-POLSK Transmission Systems by Using Semiconductor Optical Amplifiers

The authors demonstrate the potential of using POLarization Shift Keying (POLSK) modulation format combined with semiconductor optical amplifiers (SOAs) in wavelength division multiplexing (WDM) transmission systems. The constant intensity of the POLSK modulation format allows for substantial removal of cross-gain-modulation impairments in SOAs so that practical amplifier spacing values (more than 100 km) are demonstrated in various different experimental configurations. Record WDM transmission experiments at 10 Gb/s by using SOA-based amplification are presented in short and medium reach system architectures using either single mode fiber or nonzero dispersion shifted fiber     

透射与反射式云纹挠度术及其应用

给出了透射与反射式云纹挠度术,并且应用于测试物体的斜率及曲率。     

Optical Transmission Modules for Intraoffice Transmission Networks

This paper considers the requirements of, and proposes technical solutions for, the optical transmission modules used in intraoffice links. A novel crosstalk noise measurement procedure is proposed along with a quantitative evaluation method for crosstalk prevention which is very important in the development of compact modules. A procedure for circuit adjustment elimination is also proposed, previously a great obstacle to attaining low manufacturing costs. Based upon the above, two types of modules are developed for DS2 and DS3 signal transmissions which meet the requirements of small size, low power consumption, and low cost without transmission performance degradation.     

光缆和全光网技术

本简要地介绍了光通信的有关知识，并介绍了光通信技术的发展，最后对全光网的各个方面作了比较深入的探索。     

城域光传输网

主要针对业界广泛关注的城域光传输网的最新技术进展和应用进行探讨 ,分析了市场的最新需求趋势 ,并比较了目前在城域光传输网十分热门的技术方案 ,结合上海贝尔阿尔卡特公司的新一代城域光传输网解决方案 ,阐明了构建新一代城域光传输网可行的体系结构和网络策略。     

High-Capacity Optical Transmission Systems

The 25 years since the founding of the Journal of Lightwave Technology have seen more than three orders of magnitude increase in the capacity of optical transmission systems. This dramatic increase was brought about by the deployment of WDM and advances in high-speed transmission technologies.     

小型化光发射模块

文章主要介绍２．５Ｇｂ／ｓ小型化光发射模块的原理及性能。该模块具有２４针双列直插结构，体积小、成本低，是新一代的２．５Ｇｂ／ｓ光发射模块。经测试，该模型具有良好的环境温度适应能力。     

用光纤通信实现串行数据传输

与电传输相比,光纤通信在信号传输方面有着非常巨大的优势和良好的应用前景。本文从实际应用角度出发,论述了利用光纤通信实现串行数据传输的原理、方法和应用实例。在文末还指出了光纤通信在短距离通信上应用前景。     

光传输网的发展与趋势

本文回顾了光传输网络的发展,并分析了下一代产品的特点,由此得出下一代网络的主要构成。     

Optical Diffusion in Blood

Light is absorbed and scattered by whole blood. At very low hematocrit values scattering is small, but for hematocrit ?0.05 light patterns in blood indicate that scattered photons obey the diffusion equations. Diffusion theory predicts the circular light patterns observed in normal whole blood. Transmittance measurements by small fiberoptic probes in a blood medium give data which are in good agreement with diffusion theory. Values of the diffusion penetration depth ?d are obtained from the data, which give a quantitative measure of light penetration into blood.     

高速长距离光孤子传输系统和准线性传输系统

针对高速长距离光纤传输系统,本文介绍了光孤子传输和准线性传输系统的概念及其传输特性,针对单信道和波分复用两种传输模式,比较分析了它们在高速长距离传输中的优劣,并对它们的发展前景提出了自己的观点。     

Optical Transmission for Interoffice Trunks

There is general agreement among members of the engineering community that the interoffice telephone trunk is a prime candidate for commercial application of fiber optical systems. Field performance, in terms of endurance in a working telephone environment, remains as one of the few questions to be answered. A fiber optic transmission system was installed between two telephone central offices to demonstrate the performance of a practical system. The installed system uses Burrus Type LED sources and APD detectors. Most of the ancillary equipment uses conventional electronics. This paper describes the operation, considers the similarities between optical and metallic transmission requirements and discusses the method of route selection. The installation of fiber optic cable in existing underground ducts will be covered as well. Hand tools for fiber splicing developed specifically for field applications, will be described and their use will be discussed. Features characteristic to optical transmission will be accentuated.     

Optical Transmission Fiber Design Evolution

This paper reviews optical fiber design evolution for transmission systems over the past three decades, including both multimode and single-modes fibers. Key fiber attributes related to fiber transmission systems and how fiber designs have evolved to improve these attributes to enable higher and higher transmission data rate are discussed. Major fiber design change milestones in the past are covered. Also discussed are recent new developments in optical fiber technology.     

超大容量光传输系统

结合大量的实际测试结果,分析了目前最新的32/40×10Gbit/s波分复用(WDM)系统的性能及技术特点,并简要介绍了光通信领域的几项新技术及其发展趋势。     

电磁波在钢筋混凝土墙中的反射与透射研究

近十年来,随着室内无线系统迅速发展,钢筋混凝土墙对电磁波的反射与透射的研究成为热点。文中将矩量法与格林函数法相结合,对2.4 GHz的电磁波在钢筋混凝土墙中的反射与透射特性进行仿真。结果表明,钢筋条的存在产生了线线交感,使得电磁波的传播特性变得更为复杂,因而反射与传播系数的概念不再适用于定义钢筋混凝土墙的传播特性。     

多层旋波媒质平板的反射与透射

本文先利用电磁场的边界条件导出平面电磁波垂直入射于多层平板旋波媒质的透射场表达式。然后用传输线理论中的阻抗法,解决了多层平板旋波媒质的反射问题。最后对多层旋波媒质平板的一特例－双层结构型旅波吸波材料进行了计算机辅助设计分析,分析表明,双层代替单层可以在一定程度上改善涂层的吸波特性。