一种新型光域PAM4调制器及关键性能建模分析

A Novel Optical Domain PAM4 Modulator and Its Key Performance Modeling Analysis

摘要:

四级脉冲幅度调制(PAM4)在高速串行链路系统中的地位日益提高,受到越来越多的关注。传统的行波马赫-曾德尔调制器(TWMZM)的分光比为1∶1,文章提出了一种非对称光强的行波马赫-曾德尔调制器(Asymmetric Power TWMZM,AP-TWMZM),并对输入端分光比进行独立推算,得到分光比的值为4∶1。Lumerical软件的建模仿真结果表明,在插入损耗和消光比与TWMZM相当的情况下,AP-TWMZM具有更高的调制效率和更好的线性度,其线性度高达0.948。

Abstract:

Four-level pulse amplitude modulation (PAM4) plays a more and more important role in high-speed serial link systems and receives more and more attention. The traditional traveling wave Mach-Zehnder modulator (TWMZM) has a spectral ratio of 1∶1. In this paper, a traveling wave Mach-Zehnder modulator with asymmetric light intensity (AP-TWMZM) is proposed. Its optical power spectral ratio at the input side is 4∶1. The PAM4 optical signal is generated by the upper and lower arms modulation to realize the optical domain PAM4 modulation. Modeling and simulation with the Lumerical software shows that compared with traditional TWMZM, AP-TWMZM has higher modulation efficiency and its linearity is as high as 0.948.