信号偏置调制下单模激光对信号的响应特性研究-长江大学物理科学与.docVIP

信号偏置调制下单模激光对信号的响应特性研究 学 生：杨洪权，长江大学物理与科学技术学院 指导教师：韩立波，长江大学物理与科学技术学院 [摘要]在自然科学的各个领域中，随机动力学系统存在着多种多样的形式。激光是一种典型的随机动力学系统。近年来，噪声对激光系统的影响，已成为人们普遍关注的课题。本论文用线性化近似的方法，研究了信号偏置调制下由具有色关联的色泵噪声和色量子噪声驱动的单模激光增益模型对信号的响应特性。根据单模激光增益模型，建立加入偏置信号后，由具有色关联的色泵噪声和色量子噪声驱动的单模激光增益模型对信号的响应特性方程。当各种参数发生改变时，信号偏置调制下单模激光对信号的响应特性存在很大的差异。通讯工程中的调制方式通常有信号直接调制和信号偏置调制。理论和实践证明：在一般情况下，信号偏置调制优越于信号直接调制。为了提高激光器和激光通讯的质量，现代通讯工程中普遍采用信号偏置调制方式。作为特殊情况，分别讨论了无外信号的单模激光增益模型，信号直接调制下的单模激光增益模型和信号偏置调制下的单模激光增益模型的响应特性，并对三种模型的响应特性进行比较。 [关键词]信号偏置调制；单模激光；关联噪声；响应；线性化近似 The Studying of the Response Characteristics of a Single-Mode Laser to Input Signal in the Modulation of a Bias Signal Candidate: YANG HONG-QUAN, Shool of Physics Science and Technology, Yangtze University Supervisor: HAN LI-BO, Shool of Physics Science and Technology, Yangtze University [Abstract]There are various stochastic dynamics systems in many scientific fields. Laser system is a kind of typical stochastic dynamics one. Recently, the subject of the influences on laser systems by noises has attracted considerable attention. By using the linear approximation method, the response is studied in a gain-noise model of a single-mode laser driven by colored cross-correlated pump noise and quantum noise, which each is colored, with a modulated bias signal. According to a gain-noise model of a single-mode laser, we obtain the response equation in a gain-noise model of a single-mode laser driven by colored cross-correlated pump noise and quantum noise, which each is colored, with a modulated bias signal. When the parameters are changed, the response of a single-mode laser with a modulated bias signal is very different. Generally speaking, there are two ways: modulated signal and modulated bias signal in the modulation of the communication. Theories and experiences all proved that modulated bias signal is superior to modulated one in a usual case. In order to improve the quality of laser and communication, modulated bias signal is broadly adopted in modern communic