【作者】 江平新；

【导师】 容太平；

【作者基本信息】 华中科技大学 ， 电路与系统， 2004， 硕士

【摘要】 自由空间光通信是最近几年兴起的一门通信技术。大气激光通信是其在地面上的特定实现,是解决接入网“最后一公里”问题的方法之一。由于其具有设计简单,接入方便,高速率低成本等优点,是目前所见到的最有效的解决方案。大气激光通信是一种宽带技术,主要的特点是在近距离通信时能以灵活的方式,用比现有系统低得多的成本,获得光纤传送的容量,可广泛应用于智能建筑、军事等方面。光发射技术是大气激光通信的核心技术之一。本文结合一台155Mbps点对点的无线光端机的研制,对光发射子系统部分做了详细讨论。首先阐述了系统的方案设计,在这个过程中对系统的各个部分的功能、特点都进行了简单的分析。接着,对光发射子系统的光发射单元、发射控制单元等几个部分进行了详细探讨,其中对光发射单元中VCSEL和自动光功率控制;发射单元与光纤的耦合等关键问题都作了较详细的分析说明。最后,对各部分电路进行了实验测试,并给出了系统调试结果。在软件设计方面,本文还针对当前比较流行的嵌入式实时操作系统μC/OS-II,给出了其在C8051F015片上系统(SOC)上的具体实现。并结合光管理模块的具体功能,编写了一部分板级支持包(BSP),最后从总体上给出了基于此操作系统的软件设计。总结了系统需要进一步改进的方面,并对一些关键技术的应用前景进行了展望。更多还原

【Abstract】 Free-space optical communication is a prospective technology at present. The atmosphere laser communication is it’s realizing specifically on earth, and is one of the methods that solve the problem of "The Last One Kilometer" in access network. It is a system easy to be implemented, immediately untilized and is one of the most cost effective broadband wireless solution that we have seen to date. The atmospheric laser communication technology is primarily feathered by flexible access method and low cost in short distance, compared to fiber transmission capacity, and can be widely applied in the fields of intelligence building and military. The technology of transmission of laser is one of the core technologies of atmosphere laser communication. This paper makes in detail discussing to the laser transmission subsystem combining one set of 155Mbps point-to-point wireless optical communication equipment.Explained systematic conceptual design at first, the every part of the system is made simple discussing and analysis in this section. Next, the paper discusses the optical transmission communication subsystem in detail that is laser transmission unit,control unit. And the performance of system is also analysized. Among this part the key technologies such as automatic power control (APC) and VCSEL in laser transmission module, coupling between laser transmission module and optical fibre made detailed analysis. Finally, every part of the system is tested and the results of the entire system test are given. In software design, the paper focuses on popular embedded real-time operating system μC/OS-II, its transplanting on C8051F015 on-chip-system. And combine the function of optical network management module, writing some board support package (BSP). Designing the software based on this operating system and BSP on the whole finally. Finally, further improvements for the system have been summarized and the application prospect of some core technologies has been provided.更多还原