【作者】 宋艳；

【导师】 王芳；

【作者基本信息】 河南师范大学 ， 电路与系统， 2011， 硕士

【摘要】 EDFA作为新一代光通信系统中的关键部件,给光纤通信和传输技术带来了一场革命。EDFA中最关键的是它工作时增益的稳定特性,对这些特性起着决定性作用的是EDFA中泵浦激光器的输出是否具有稳定性,这就要求在选择泵浦激光器的驱动电路时,要选择稳定性能强的电路。本文针对EDFA的这一特性需求,对驱动电路的结构和性能进行研究和设计,研究重点恒流源电路作为泵浦激光器的驱动的改进设计,同时实现了基于FPGA的EDFA硬件电路的设计。本论文的主要内容分为以下四个方面:首先,介绍了目前光纤通信的发展状况,国内掺铒光纤放大器的研究情况,掺铒光纤放大器的在光纤通信中的作用和地位,本论文的内容和所承担的任务。其次,介绍了EDFA的构成框架,EDFA的工作原理及结构组成,它主要包括光路部分和电路部分,简述了EDFA的光路结构组成和电路结构组成。第三,重点构建了EDFA中泵浦激光器驱动电路的整体电路结构图,泵浦激光器驱动电路结构有以下几部分组成:慢启动电路、纹波调节电路、过流保护电路、上电防冲击电路、恒流源电路、光电探测电路、温度控制电路,其中重点研究了恒流源电路作为泵浦激光器的驱动的改进设计,在Pspice环境下绘制驱动电路,并对所设计的电路进行直流扫描、瞬态、温度及噪声分析,从而验证所设计电路的准确性和可行性,将理论计算和模拟分析的结果进行比对,得到此设计电路能够更进一步提高驱动电路的稳定性,使泵浦激光器得到更加稳定的输出,仿真结果和理论分析基本一致。最后,将研究设计的泵浦激光器驱动电路用在基于FPGA的带自动增益控制的EDFA中,利用FPGA处理复杂的时序方便的特点,结合PID算法,使得该电路具有结构简单、便于扩展、高可靠和易实现等特点,采用FPGA对泵浦激光器驱动电路进行硬件设计,增加了整个系统的可靠性,从而使驱动电源具有智能化程度高、抗干扰能力强、温度控制精度高、电源稳定度高、对激光器无损害等优点。更多还原

【Abstract】 EDFA optical communication system as a new generation of key components, optical fiber communication and transmission technology to bring about a revolution. EDFA is its most critical work, the stability of the gain characteristics of these features play a decisive role in the EDFA pump laser is whether the stability of the output, which requires the selection of the drive circuit when the pump laser, to select Strong stability of the circuit.In this paper, the characteristics of EDFA’s demand for driver circuit structure and performance of research and design, research focused pump laser current source circuit as the driver of the improved design, while achieving the EDFA-based FPGA hardware design. The paper is divided into the following four areas:First, the introduction of the current development of optical fiber communications, erbium-doped fiber amplifier domestic research situation, erbium-doped fiber amplifier in optical fiber communication in the role and status of the contents of this paper and the tasks undertaken.Second, the composition of the framework introduced EDFA, EDFA’s operating principle and structure of the composition, which includes optical parts and circuit parts, outlines the composition EDFA’s optical structure and circuit structures.And third, build the EDFA pump laser driver circuit in the overall circuit structure, the pump laser driver circuit structure has the following components: slow-start circuit, the ripple regulator circuit, over-current protection circuit, power anti-shock circuit , constant current source circuit, optical detection circuit, temperature control circuit, which focuses on the constant current source circuit as the pump laser drive improved design, drawn in Pspice environment, drive circuit, and the DC circuit designed scan transient, temperature and noise analysis to verify the accuracy and feasibility of the circuit design, the theoretical calculation and simulation to compare the results obtained in this design the circuit to further improve the driving stability of the circuit, so that the pump laser be more stable output, the simulation results and theoretical analysis is consistent.Finally, the research design of the pump laser driver circuit used in FPGA-based automatic gain control EDFA with, the use of FPGA to handle complex timing and convenient features, combined with PID algorithm, making the circuit has a simple, scalable, highly reliable easy to achieve such characteristics, the pump laser driver circuit on FPGA hardware design, increase the reliability of the whole system, so that drive power with high intelligence, anti-interference ability, high precision temperature control, high power stability on the laser without damage and so on.更多还原