【作者】 吴广生；

【导师】 胡必春；

【作者基本信息】 华中科技大学 ， 物理电子学， 2004， 硕士

【摘要】 随着通信技术的发展,通信业务将转向以高速 IP 数据和多媒体为代表的宽带业务,这就要求以波分复用技术(DWDM)为基础的光传输网络能够承载更多的信息量。但是,掺铒光纤放大器(EDFA)的可用带宽已经枯竭,要开辟新的传输窗口就需要研究新型的光放大器。喇曼光纤放大器(FRA)由于其全波长放大和分布式放大特性以及低噪声特性等,使得它在提高现有传输系统速率,提升光网络的传输容量以及增加无中继传输距离方面表现出突出的优势。因此,随着泵浦技术的成熟,喇曼光纤放大器受到了越来越多的关注。本文对喇曼光纤放大器进行了一系列理论分析,在此基础上,设计实现了多波长喇曼泵浦模块,并进行了实验研究。本文对喇曼光纤放大器的主要研究内容和研究结果如下:(1) 阐述了喇曼光纤放大器的理论基础,分析了喇曼光纤放大器的增益饱和特性、增益带宽特性、偏振相关性、噪声特性以及大功率喇曼泵浦特性等。 (2) 介绍了设计多波长泵浦喇曼光纤放大器的主要考虑因素,分析了泵浦配置、光纤类型、偏振问题等对放大器增益特性的影响,讨论了泵浦配置的原则。 (3) 对喇曼光纤放大器设计中用到的主要光学器件做了介绍,分析了多波长喇曼泵浦模块的结构,重点介绍了泵浦激光器驱动、温控电路的设计和控制电路设计。 (4) 对喇曼光纤放大器进行了实验分析,重点测试了信号开关增益、增益平坦度、偏振相关性和等效噪声指数等,并讨论了泵浦之间的互作用现象。 (5) 讨论了增益饱和的喇曼光纤放大器中存在的增益瞬态现象,给出了抑制瞬态效应的方案。更多还原

【Abstract】 With the development of telecommunication technology, the service of communicationwill turn to broadband service charactered as high speed IP data and multimedia data whichrequire the optical network based on the technology of DWDM provide larger capacity totransfer information. But the available gain band of EDFA is now being used up. FiberRaman amplifier (FRA) with all-wave and distributed amplification and low noise figure hasbeen the new hot spot in recent research. Distributed FRA offers several advantages, such asenhancing the bitrates of transmission system, boosting the capacity of optical networks,expanding the relay distance, etc. Therefore, when high-power pump sources becomecommercially available, the FRA gains more and more concern. This dissertation analyzes the principle of FRA and designs the multi-wavelengthRaman pump module.On the basis of the pump module,we operate a series of experimentaltest.The details show as following: (1) FRA’s basic theory is detailed.The properties of FRA are discussed, including gainsaturation property, polarization correlation, noise property and high power pump sourceproperty. (2) Discussing the main factors in multi-wavelength pumped FRA’s design, analyzing theprinciple of pump configuration. (3) The main optical devices used in FRA are introduced.The design of pump’s currentdriving and temperature controlling circuit is stressed. (4) Throgh many experiment,we tested the FRA’s properties,including signal On-Offgain,gain variation,polarization correlation and equal noise figure. (5) Transient phenomena in discrete FRA is analyzed, and methods to suppress transientsare also given.更多还原