多维多阶调制格式产生方案的比较研究

Analysis and comparison of the generation schemes for multi-dimensional and multi-level modulation formats

随着带宽需求的不断增长,多维多阶调制格式成为目前研究的热点。文章对8PSK(3阶相移键控)、8QAM(3阶正交调幅)和16QAM(4阶正交调幅)的实现方式从原理和拓扑结构上进行了综合性的比较研究。使用已商用的调制器件,通过串行或串并混合的结构配置,可以得到8PSK、8QAM和16QAM的调制光信号;而使用并行结构的配置方式,可以提高系统的集成度和信号的传输性能,但往往需要多个并行配置调制的新结构,对系统集成的成本和工艺提出了苛刻的要求。

With the continuously growing demand for optical network bandwidths,multi-dimensional and multi-level modulation formats,such as 8PSK,8QAM,16QAM,have become a current focal point of research.In this paper,we make a comprehensive comparative analysis of the principles and topologies for the realization of these formats and obtain 8PSK,8QAM and 16QAM modulated optical signals by using commercially available modulation devices configured in a serial or hybrid structure.We can improve the system integration level and signal transmission performances by using configuration in a parallel structure,but it often needs multiple parallel structures,which raises harsh requirements on the cost and processes for system integration.