【作者】 刘炜霞；

【导师】 陈伟；

【作者基本信息】 武汉理工大学 ， 交通信息工程及控制， 2003， 硕士

【摘要】 近年来，突发模式的数据传输方式正在越来越多的应用于数字通信系统中，这些系统通过光纤、无线和同轴电缆等媒质实现点到多点的连接。各国的设计人员都在进行使用时分多址(TDMA)技术的本地接入方式的研究工作，例如在本地接入方式中，利用工作于突发模式的无源光网络(PON)实现光纤到用户、光纤到路边的连接。 随着视频点播等交互业务的出现，用户到中心局的通信量大为增加。因此，能够为用户提供话音、数据和视频的综合通信的宽带多媒体接入方式成为当今世界的热门研究和开发领域。其中，以ATM为基础的无源光网络(ATM-PON或APON)是能够提供所需带宽的技术之一，它结合了ATM多业务和多比特率的支持能力和PON的透明宽带传输能力，具有较高的技术优势，因而备受各国的关注。 APON系统利用无源单星／双星结构及特殊的点对多点多址协议使得多个光网络单元共享一个光线路终端，实现资源的共享。其核心是在PON上采用TDMA方式传输ATM信元。APON的这种点到多点的网络结构和时分多址的工作方式决定了其上行信号是以“突发”方式工作的。由于不同的光网络单元ONU与光线路终端OLT的距离不同，实际工作时到达接收端的信号的幅度，相位都相差很大。APON系统中所用的突发式光收发模块就是应用于对系统上行通道的突发光信号发射和接收。要想成功地实现对突发信号的收发，收发端都要采用特殊的技术，因此，突发模式的光电收发技术是APON系统的关键技术之一。 由于突发信号的上述特征，目前常规的信号产生仪器均无法产生这样的突发式光信号，对其研究和相关测试极为不便。因此在研究突发光模块的过程中，就需要建立一套测试系统来产生突发光信号，模拟出突发信号幅度和相位不均衡的特点，同时还要能够根据需要改变相关的数据，通过突发光信号模拟产生系统来仿真PON上行信号的实际发送和接收过程，以检测发射模块和接收模块的性能，只有这样测出的模块指标才能满足实际系统的要求。由于突发式光信号的特殊性，其性能的测试与常规模块的指标测试有一些不同之处。本文就是根据课题组承担的湖北省科技攻关重大项目“宽带接入网武汉理工大学硕士学位论文的突发式光发射和接收模块研究”的技术方案，对突发光模块的相关指标测试问题进行深入地分析和研究，并提出了具体有效的测试方法。 论文主要内容包括8章。第1章对国内外宽带接入技术及APON系统的发展动态进行了分析，明确了课题研究的目的和意义，介绍了研究的主要内容。第2章深入研究了APON系统的原理及关键技术。第3章分析了1 55Mb/s突发式光收发模块的技术特点，并提出了设计与实现方法。第4章对突发式光测试系统的功能、原理，总体测试设置及方法进行了论述。第5章详细介绍了为实现对突发式光收发模块的测试而设计的突发信号模拟产生器的基本原理与各部分功能电路的实现。第6章和第7章分别对具体指标的测试过程和测试结果进行了分析和论述。第8章是对全文的总结。更多还原

【Abstract】 These years, the use of burst mode data transmission is increasing in digital-communication systems. These systems use point-to-point and point-to-multipoint connections over optical, wireless, and coaxial media. Designers worldwide are working on local-access approaches using time-division multiple-access (TDMA) technology. Examples include using passive optical networks (PONs) to realize fiber to the home, fiber to the curb.With the advent of the interactive services such as VOD (Video On Demand), the communication traffic from subscriber to central office are increasing significantly. And the broadband multimedia access technology that can afford voice, data, and video is one of today’s hottest research-and-development areas. Of which, the passive optical network based on ATM (Asynchronous Transmission Mode) is one of the technologies that can supply the needed bandwidth. It combines the multi-services and multi-bit rate ability of ATM and the transparent transfer ability of PON, has higher technique dominance, and attracts many attentions.The APON system use the passive single-star or double-star architecture and the special point-to-multipoint multiple address protocol, the multiple branches (ONUs) share the capacity of one fiber and connect to one OLT to realize the sharing of the resources. The kernel of the APON is to transfer the ATM cells over PON. The network architecture of point-to-multipoint and the working mode of TDMA (Time Division Multiple Address) of APON make the upstream signal works in burst mode. Because the distances from different ONUs to OLT are different, the amplitudes and phases of the different signals will have significant difference when receiving the receive terminal. The burst mode optical transmitter and receiver module are used to transmit and receive the upstream burst-mode optical signal. To transmit and receive the signal successfully, both the receiving and the transmitting terminal need to use special technology. The burst mode optical transmitting and receiving technology is one of the key techniques used in APON system.However, up to now none of the signal generators can generate burst mode optical signal, so the research and test of the module are very inconvenient. So we setup a test system to generate burst mode optical signal, to simulate the feature of amplitude and phase disproportion of the burst mode signal, and at the same time it can change the relevant data when needed. The burst mode optical signal generators are used to simulate the upstream transmitting and receiving process, and detect the characteristics of the transmitter and receiver module. Only use this method, the indexes measured can satisfy the requirement of the real system. Because of the particularity of the burst mode optical signal, there are many differences between the continuous mode module and the burst mode module. On the basis of the technique scheme of the item-Researching of the Burst Mode Optical Receiver and Transmitter Module used in Broadband Access Network, this paper introduces the setup of the test system of the burst mode optical module for APON, offers the test indexes and method.There are 8 chapters in this paper. In chapter 1, the latest developments in the broadband access technology and APON system are described. The research aim, significance and the main research content of this paper are put forward. Chapter 2 analyzes the principle of the APON system and the key technologies used in it. Chapter 3 introduces technique characteristic of burst mode optical receiver and transmitter module in APON system, and proposes a method of designing 155Mb/s burst mode optical receiver and transmitter module. Chapter 4 discusses the function, principle, testing setup and method of the burst mode optical test system, and gives the main test index. Chapter 5 particularly introduces basic principle of the circuit of the burst mode signal generator used for the testing of the burst mode optical transmitter and receiver module. Chapter 6 and chapter 7 introduce the proce更多还原