摘要:In this paper, equivalent circuit models of semiconductor laser diodes and photodetectors are developed respectively in general purpose circuit analysis program PSPICE. whose model parameters can be extracted from external performance of the devices. The characteristics of a practical microwave subcarrier multiplexed (SCM) lightwave system are analyzed by using the presented models. The simulated results have a good agreement with experimental data.
关键词:PSPICE;microwave subcarrier multiplexed lightwave system
摘要:In this paper,the polarization control of optical fiber in coherent optical communication system is theoretically studied and the mathematical model is proposed. Consequently, a reset equation of fiber squeezer in solving endless polarization control is obtained.
摘要:This article introduces a 155Mbit/s add—drop multiplexer produced by GPT corporation. The general structure, functions of individual circuit card, management method and equipment management operation system have been described as well.
摘要:High speed and large capacity are the trends in the development of optical fiber communications. In this paper, the high speed light source, optical modulator, optical detector, optical amplifier and optical fiber dispersion equation are discussed, which are the main technical issues for IM/DD fiber optic transmissions.
摘要:<正> 据《NEC技报》1993年5月报道:ITS—2400 1:N SONET传输系统是北美长途通信公司开发的,具有最大传输容量的光通信传输系统。ITS—2400系统由NEC SONET设备构成,将非同步的DS3(44.736Mbit/s)信号、同步的OC—3(155.52Mbit/s)信号或同步的OC—12(622.08Mbit/s)信号复用成同步的OC—48(2.4Gbit/s)的光信号。本系统具有以下特长:
摘要:In this paper,the mode field diameter of random—core and double—cladding single mode fibers is studied through computer. This method is widely applicable and has the merits of high accuracy and speed. It has been proved to have a highly applicable value by comparing with the experimental results.
关键词:double cladding;single mode fiber;mode field diameter
摘要:This paper discusses the mechanical reliability of long—length optical fibers. Two kinds of reference techniques for proof testing of optical fiber strength as well as the test methods are briefly presented. Optical fiber strength after proof testing is theoretically, analyzed. Finally,optical fiber lifetime is estimated and the lifetime design picture of optical fiber which passed three—grades proof testing strain is given.
摘要:The high temperature softening property of quartz glass tube used in the field of optical fiber fabrication is studied. The high temperature status of different samples were observed with high temperature microscope. The contents of varied metal impurities and the OH ions were measured respectively. The factors influencing the high temperature softening properties of quartz glass are discussed in detail. The suggestions for improving the quality of China—made quartz glass tubes are proposed.
摘要:In this paper, the design and fabrication of a stainless PC SM optical fiber connector is presented. The stainless material is used for the pin proper with its endface is made into a spherical shape. The typical value of insertion loss is 0. 3 dB,and the return loss is more than 35 dB. With a excellent anti—reflection performance,it is thereby especially applicable to the large capacity,extra high speed digital transmission,wide band video analogue transmission and LAN optical fiber communication system.
关键词:stainless;PC SM optical fiber connector;return loss
摘要:The performances and the application of QGG06—W intelligent optical power meter suitable for field installation project are described in this paper. The introduction focuses on the principle and feature of the meter.
关键词:optical power meter;optical attenuation;single-chip microcomputer
摘要:Tetraethoxysilane was hydrolyzed with HCl and mixture of HF with the fumed silica was added and well—dispersed. By adding ammonia solution the pH value of sol was adjusted to 4. 5 and the sol was poured into a polypropylene mold and gelled,then the gel was dried into dry—gel and sintered into silica glass. Large—size silica glass tubes are obtained whose outside diameter is 20 mm,the wall thickness is 2. 5 mm and the length is 250 mm,the ratio of the volumes of wet gel to silica glass is 50%,Dry—gel is not easy to crack. The rate of finished products is about 90%.
摘要:<正> 1993年10月28日美国工程科学院院士,AT&T Bell Lab激光和光纤通信专家厉鼎毅博士偕同Bellcore宽带光波系统研究室主任林清隆博士来上海。厉博士是上海交通大学名誉教授,曾多次来国内讲学,林博士是新竹交大兼职教授,这是第一次来上海进行学术交流。两位博士于10月29日上午和30日上午在交大举行了演讲和座谈会。他们详细介绍了最近3年国际上光纤放大器(EDFA)和波分多路技术(WDM)的重要作用,以及由这两者形成新的一代光波传输系统(即我们常称的光纤通信系统)。特别使我们受到鼓舞和加强信心的是,我们对光纤通信的一些重要观点获得了两位国际