L波段掺铒光纤放大器的研究.doc

毕 业 设 计（论 文） 题 目 L波段掺铒光纤放大器的研究 姓 名 所在学院 理学院 专业班级 06光信1 学 号 指导教师 日 期 2009年12月15日  摘 要 作为光通信系统中的一个关键器件在光通信领域中扮演着十分重要的角色。然而随着系统容量的不断增加，目前所使用的波段已不能满足系统扩容的要求，这就迫切需要向波段或更短的波段扩展。由于工作在波段的波长远离掺铒光纤()的吸收峰()，导致波段的增益效率受到了一定的限制，因此如何提高波段的增益效率具有重要的学术意义和实际应用价值。 本论文在前人的基础上，对提高波段的增益效率进行了系统的研究和模拟仿真。通过模拟不同结构的Ｌ波段掺铒光纤放大器，得到了不同的系统增益特性及其他性能指标。例如： １.模拟仿真了基于光环形器的双通结构波段。结果表明：基于光环形器的双通结构波段其增益较传统波段提高了７ｄＢ　，功率转换效率提高到２７.２９％　。 ２.模拟仿真了Ｌ波段双级级联双程放大的放大器结构。结果表明：在小信号功率（－３０ｄＢｍ）输入条件下、波长范围内，放大器输出增益都大于同时增益平坦度优于。其噪声指数在整个L波段都小于（处噪声指数仅为）。 关键词：光放大器 掺铒光纤 L波段 C波段 Abstract EDFA as optical communication systems, a key device in optical communications field plays an important role. However, with the continuous increase in system capacity, The C-band currently in use can not meet the requirements of the system expansion, There is an urgent need to EDFA or less to the L-band S-band extension. As the work in the L-band wavelength away from the erbium-doped fiber (EDF) of the absorption peak (1531nm), Leading to L-band EDFA gain efficiency by certain restrictions, Therefore, how to improve the efficiency of L-Band EDFA gain significant academic significance and practical application value. In the predecessors of this paper, based on improving the efficiency of L-band EDFA gain a systematic study and simulation. By simulating different structures of the L-band erbium-doped fiber amplifier, has been a different system gain characteristics and other performance indicators. For example: 1. Simulation of the device based on optical ring structure of the double-pass L-band EDFA. The results showed that: device based on optical ring structure of the double-pass L-band EDFA its more traditional L-band EDFA gain increases 7dB, power conversion efficiency increased to 27.29%. 2. Simulation of the L-band two-stage double-pass amplification of the amplifier cascade structure. Results showed that: In the small-signal power (-