【作者】 朱炜；

【导师】 赵学增； 许文海；

【作者基本信息】 哈尔滨工业大学 ， 机械电子工程， 2006， 博士

【摘要】 当代社会和经济发展中,信息容量日益剧增,为提高信息的传输速度和容量,光纤通信被广泛的应用于信息化的发展,成为继微电子技术之后信息领域中的重要技术。密集波分复用(Dense Wavelength Division Multiplexing, DWDM)技术是提高光纤通信系统容量的最主要技术。随着通信系统容量的增加,DWDM系统的信道数成倍增加,每个信道容量也逐步提升,这些都大大增加了对DWDM光源输出精度和稳定性的要求。本文在对DWDM光源设计的各项关键技术进行综述的基础上,结合目前实际情况,提出了从LD(Laser Diode, LD)的控制模型入手,研究DWDM光源混合式控制技术。首先从LD的温度特性入手,分析了分布反馈式LD(Distribute Feedback Laser diode, DFB-LD)的温度控制误差、温度控制对象。在温度特性的基础上,以LD的速率方程为基础,进一步分析了输出功率和输出波长特性。并以自主设计的LD参数测试仪为核心搭建测试系统,对模型进行实验验证。以LD的温度控制对象模型为基础,分析DWDM光源运行规律,设计DWDM光源的温度控制系统。该温度控制系统利用软硬件复合补偿的方法提高温度控制的精度,利用模糊参数可调的模拟PI控制器提高系统的稳态响应。为了解决温度启动过程中的时间滞后,改善系统的响应速度,采用单独的温度启动控制策略,启动阶段采用带预测的模糊-PI控制器,在保证系统的快速性的基础上尽量减少系统超调,同时对控制对象的时间滞后有抑制作用。在高精度、高稳定的温度控制基础上,利用LD的波长-温度关系,设计了LD的波长锁定模块。分析了引起波长漂移的因素,设计了LD的模拟老化实验,验证波长锁定模块的波长控制效果。依据国家标准对DWDM光源的输出波长的长期稳定度进行测试。以LD的功率输出特性模型为基础,依据DWDM光源系统的设计要求,设计了自动功率控制/自动电流控制(APC/ACC)的功率控制器,并依据相关国家标准进行了功率的稳定度输出测试,验证功率控制器的控制效果。分析了浪涌对LD的危害,设计了防静电、软启动、LD过流保护一系列的LD的浪涌保护措施,同时设计了半导体制冷器的过流保护装置,保证系统长期正常工作。更多还原

【Abstract】 With the development of society and economy, the capability of the information system grows day by day. Optical fiber communication, which is extensive used in the development of informatization, becomes the most important technology after the microelectronic technique. DWDM (Dense Wavelength Division Multiplexing) is the most important technology which enhances the capability of the optical fiber communication system. With the development of communication system capability, the channels of the DWDM system are geminated and the capability of every channel grows gradually. All of these require the DWDM source output has high precision and stability.The key techniques of the DWDM source design are discussed. With these techniques and the practical situation, we select a scheme. This scheme based on control model of the LD (laser diode) module. And the study keystone is the hybrid control technique of DWDM source.Based on the rate equation and the temperature characteristic of the LD, the temperature control object model and the temperature control error of DFB-LD are analyzed. Then the power and wavelength output characteristic is farther analyzed. The test system, whose core is the LD parameter test instrument designed by ourselves, is established to validate the control model.Based on the temperature control object model of the LD module and the running characteristic of the DWDM source are analyzed, the temperature control system of the DWDM source is designed. In this system, the soft hardware complex-compensate technique is adopted to enhance the precision of temperature control, the analog PI controller, whose parameters are adjusted by analog fuzzy controller, is designed to enhance the stationary response. To restrain the time-delay of the startup phase of the temperature and improve the response speed, the fuzzy-PI controller with predictive control is adopted to the startup phase. This control mode can decrease the system overshoot and ensure the system rapidity. The predictive control can restrain the time-delay of the controlled object.On the high precision and stability temperature control system and the更多还原