【作者】 孙振超；

【导师】 王智；

【作者基本信息】 北京交通大学 ， 光学工程， 2011， 硕士

【摘要】 摘要：在大容量的光交换网络中,信号经过长距离的传输以及在节点中交换或交叉连接,会出现引入串扰、损耗、色散、非线性等问题,使得光信号的强度、相位、形状等发生变化,因此光信号要经过3R再生(放大、整形、定时)处理。全光判决作为3R再生的一项关键技术,有非常高的研究价值。本文以基于环形腔激光器的光判决技术为研究重点,对其进行了深入的理论分析和实验研究。本论文的研究成果主要包括以下内容：1.分析了半导体光放大器的输入输出特性以及环形腔激光器的静态工作点,利用图解法形象直观的分析了环形腔激光器的起振和抑制过程。分析了SOA的驱动电流以及激光器中反馈系数与判决阂值的关系,并以此实现阈值可调功能。2.由理论分析的结果拟合出判决输出信号的上升沿与下降沿波形。分析提出通过减小激光器的反馈系数、增大外部注入光功率、减小环长等方法来提高判决器的响应速度。3.利用基于环形腔激光器的判决器对含有噪声的数字信号光进行判决实验,成功的将信号的振幅抖动修正。解释了实际信号的上升沿波形与理论拟合的上升沿波形有差异的原因,并且分析了S-FRL起振时出现的瞬间放大特性。更多还原

【Abstract】 In the switched network with large capacity, some problems, such as introducing crosstalk, wastage, dispersion, nonlinearity, and so on, might emerge, due to the reason that the signal should experience a long-distant transmission and exchange or cross-linking at the pitch points. These problems will lead to the change of the strength, phase and form of the optical signal. Therefore, the 3R regeneration (Re-amplifying, Re-timing, Re-shaping) dispose is needed for the optical signal. And as the core technology of 3R regeneration, all-optical decision has great researching significance. This thesis implements theoretical analysis and experimental research deeply into the optical decision technology based on the fiber ring laser.The researching results of this thesis can be described as follow:1) It analyzed the in-out features of the semiconductor optical amplifier (SOA) and the quiescent point of the fiber ring laser. And with the use of the graphical method, it imitated the processes of start-oscillation and inhibition. Also, this thesis summarized the relationship between the decision threshold and elements such as drive current of SOA and the reaction coefficient of the laser, according to which the adjustable function of the threshold can be realized.2) It imitated the wave forms of rising and falling edges of the decision output signal, and also provided the ways of decreasing the reaction coefficient of the laser, amplifying the power of the inject light, minishing the length of the ring, and so on, to increase the response speed of the decision device.3) The researcher used the decision device with fiber ring laser to implement the decision experiment to the digital signal light with noise and succeeded in modifying the amplitude shakes of the signal. And in this thesis, the reasons why the practical wave form of rising edge was different from the theoretical one were explained, and the instant amplification characteristic of S-FRL at the starting point was presented.更多还原