基于串行最小频移键控的8进制调制的研究

提出了一种新型的基于串行结构的最小频移键控调制技术,产生了相位连续,频谱宽度窄,每码元时间有两次π/2相移,类似于传统最小频移键控调制信号,给出了该调制方案的理论推导,并将其应用于8进制的多维多阶调制系统中。理论和仿真分析了不同的8进制调制方案在频谱特性,残留色散容限,自相位调制容限的不同,还分析了其受到系统滤波带宽的影响。最后仿真实现了通过350km的色散完全补偿的光纤120Gb/s的数据传输。     

High speed optical transmission utilizing constant envelope modulation based on frequency shift keying and minimum-shift keying

A novel 40-Gb/s constant envelope optical frequency shift keying （FSK） transmitter and the transmission characteristics are investigated both by simulation and experiment. Meanwhile, to increase the spectrum efficiency of FSK, we propose a novel optical minimum-shift keying （MSK） scheme and analyze its per-formance compared with other MSK schemes and other traditional modulation formats. Simulation and experimental results show that the novel FSK scheme could be a potential candidate for the future high speed transmission and label switching systems. And the novel MSK scheme deserves future deep research for its potential excellent performance.     

10G/40G无载波幅度相位调制系统性能研究

无载波幅度相位调制(Carrierless Amplitude and Phase,CAP)是超高速短距离光通信系统中的一种备选的方案,由于其成本低、频谱效率高、功耗小等优点,近年来越来越受到研究人员的关注。基于MATLAB与VPI联合仿真,探究10G/40G速率CAP系统中关键参数对系统性能的影响,包括数字滤波器滚降系数、滤波器抽头数,通过仿真找出最优系统参数值,同时对时钟偏移带来的影响也做了研究,以期为以后设计短距离CAP光通信系统有所帮助。