摘要
在长距离光通信系统中,采用高阶外调制和相干接收技术来提高系统总的传输容量。但是在短距离光通信系统中更倾向于使用低成本的直接调制-直接检测技术,此时,要实现高速、大容量传输就必须采用多电平调制。目前国际上主流的调制方案有三种:PAM(脉冲幅度调制)、DD-OFDM(直接检测-正交频分复用)调制和CAP(无载波幅度相位)调制,文章对这三种方案的原理与性能进行了分析与比较,希望以此作为未来短距离大容量光通信系统设计的依据。
High-order external modulation and coherent detection technology are generally used in long-haul optical communica-tion systems to improve the overall system transmission capacity.However,a low-cost direct modulation-direct detection tech-nology tends to be more used in short-haul optical communication systems.In this case,it is necessary to adopt advanced multi-level modulation to realize high-rate large-capacity transmission.Currently,there are three principal modulation schemes considered internationally,i.e.Pulse Amplitude Modulation （PAM）,Direct Detection-Orthogonal Frequency Division Multi-plexing （DD-OFDM）modulation,Carrierless Amplitude/Phase （CAP）modulation.This paper analyzes and compares their principles and performances,hoping to use them as the basis for the design of future short-haul large-capacity optical communi-cation systems.
出处
《光通信研究》
北大核心
2014年第3期11-14,55,共5页
Study on Optical Communications
基金
国家自然科学基金资助项目(61177071
61250018)
国家科技支撑计划"新媒体资源管理关键技术研究与集成平台应用示范"资助项目(2012BAH18B00)
上海市科委重点项目(12dz1143000)
