The history of optical fiber development is recalled . some popular fields of optical fiber technology study and the facing problems in the fields are simply described , which can supply some instructive reference to the investigators . according to the overview of optical fiber technology , the optical fiber theory is deeply studied in order to find an effective solution to settle the problems in fiber technology 本文对光纤的发展及光纤技术做了综述，回顾了光纤的发展历程，略述了光纤的几个应用技术领域并对近几年光纤技术的几个热点及它们的发展状况和面临的问题做了简要的叙述，为对光纤及光纤技术研究感兴趣的人提供了有意义的参考。
In the first part , the article summarized the definition and importance about dissolved oxygen ( do ) , the general methods of measuring do . the origin , development and excellence of usage in chemical sensor with fiber - optical technology , the characteristic of fiber optical chemical sensor are introduced . those deferent fluorescence indicators have been used in oxygen sensors during more than twenty years and their deferent capability as fluorescence indicators 在第一章中，在研读文献的基础上综述了溶解氧的定义和在生产生活中的重要意义；溶解氧测定的常规方法；光纤技术的起源、发展及其应用于化学传感器的优点；光纤化学传感器的原理特点；探索了不同时期应用于氧传感器的荧光指示剂的种类和性能；制备氧传感探头的几种方法原理和光纤氧传感器在医学、生物、海洋监测等领域中的应用现状。
The normal user must go through the access network and backbone to access the internet via icp there are always high - rate and broadband lines connected to the backbone , the backbone of telecom can provide wide enough bandwidth for all the data transmission as more and more optic fiber with wdm and dwdm technologies have been paved . but " the last mile " from user ' s home to central office is still narrow - band and analog , which becomes bottom - neck of the communication subnet preventing it from being widen 一般用户使用internet时要经过接入网，电信主干网，最后达到icp ( internetcontentprovider ：因特网内容提供商) 。其中icp一般有着高速宽带的线路与主干网相连，而主干网由于波分复用或密集波分复用的光纤技术的大量使用，使得其可提供足够的带宽使用，但是，接入网? ?从用户家庭到电信网的局端的这“最后一公里” ，仍然是窄带的、模拟的，这“最后一公里”就是电信网宽带化的瓶颈。
This paper introduced principle of magnetism - photo optical - fiber electric current measurement system , and designs a digital magnetism - photo optical - fiber electric current meter . with the development of optical - fiber technology and electronic components reliability , the magnetism - photo electric current detection method will be used more widely 论述了磁光式光纤电流测试系统的原理，并设计了一种数字式磁光光纤电流计，该装置所运用的测量方法是电力系统中高压大电流测量技术的一个新方向，随着光纤技术和电子器件可靠性的发展，磁光式电流检测技术可望得到推广使用。
Fabry - perot sensing is a new strain measurement technology with the development of fiber technology at the end of 1980 ， extrinsic fabry - perot interferometer ( efpi ) had become a hot point in the area of " smart structure " in foreign countries since it has the advantage of simple structure and low sensitivity towards temperature . domestic research on fabry - perot sensor is still at the laboratory stage , and there is little report of the application on the smart structure 光纤法珀应变传感是80年代末随着光纤技术的发展而发展起来的一种新型的应变测量技术，其中非本征型光纤法珀传感器由于具有结构简单，温漂时漂小等优点，非常适合智能结构尤其是桥梁的长期在线应变监测，目前已经成为国外应变传感技术研究的重点之一。
This dissertation discuss the key technology of wide band digital t / r module , including : architecture of the wide band digital t / r module ; wide band signal generating technology based on ddws ; using fiber technology to transmit data between radar center and t / r moudle . after studying the digtal t / r module technology over the world , this dissertation present a scheme of l band ( 1300mhz ) wide band ( b = 100mhz ) digital t / r module , and design a test board to verify transmitting technology of wide band digital t / r module , it works at l band . it use gigabit fiber components to transmit data between radar center and t / r module , use ddws and quadrature modulate technology to generate wide band radar transmitting signal , all control signal is generated by fpga 本文探讨了宽带数字t / r组件发射通道的关键技术,主要包括:数字t / r组件的体系结构、基于ddws技术的宽带信号的产生以及数字t / r组件收发数据的光传输技术。本文在深入研究了国内外数字t / r组件技术的基础上,提出了一种l波段( 1300mhz )宽带( b = 100mhz )数字t / r组件的原理框图,并且设计了试验板来验证宽带数字t / r组件发射通道技术。该试验板采用千兆比特光纤技术实现宽带数字t / r组件与雷达主机的数据传输,采用ddws加正交调制技术产生宽带雷达信号,采用一片fpga完成整个组件的控制。
In communication networks many kinds of traffic have stringent end - to - end quality of service ( qos ) requirements ， including delay , bandwidth , packet loss rate etc . with the development of the personal mobile communication system and wide utilization of wireless local area network ( wlan ) , more and more people began to concern on the problems of providing qos on the wireless networks 在有线网络中，许多业务，如语音、视频业务等，有严格的端到端服务质量要求，包括时延、带宽、丢包率等等。随着光纤技术日新月异的发展，主干网上的带宽变得越来越大，而作为接入部分的无线网络带宽资源相对较小。这样，无线接入部分就成为整个网络中端到端连接服务质量的瓶颈。
