ADC/DAC resolution tolerance improvement by implementing probabilistic shaping distributions in PAM and QAM modulation schemes

Xiao Han, Yang Yue, Zhen Qu, Ryan Holmes, Ivan B. Djordjevic

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, we simulated the ADC/DAC resolution tolerance improvement by implementing probabilistic shaping (PS) distributions in PAM and QAM modulation schemes for 400G and 800G transmissions. We compared PS- and uniformdistributed PM-16QAM, PM-32QAM, and PM-64QAM performance in 800G coherent transmission in FR links. The PS distribution scheme is based on Maxwell-Boltzmann distribution, and 0.1378 FEC overhead is chosen. We demonstrate that for any of these modulation schemes the post-BER (post-FEC bit-error rate) performance is more sensitive to ADC resolution. Moreover, the application of PS distribution can offer us 0.5-dB improvement in received optical power (ROP) for LDPC-coded PM-16QAM and 0.7-dB improvement for PM-32QAM, while PM-64QAM can get 0.6-dB improvement in ROP. For PAM transmission, we simulated a 4-channel CWDM 400G transmission system with wavelengths 1271 nm, 1291 nm, 1311 nm, and 1331 nm for 4-PAM modulation scheme. The PS distribution scheme we used in PAM is exponential distribution, and the FEC overhead is also 0.1378. We demonstrated that the pre-SER (pre-FEC symbol-error rate) performance is also more sensitive to the ADC resolution compared to DAC resolution. Therefore, the PS LPDCcoded modulation represents a great candidate to improve the system performance and reduce the cost.

Original languageEnglish (US)
Title of host publicationMetro and Data Center Optical Networks and Short-Reach Links IV
EditorsAtul K. Srivastava, Madeleine Glick, Youichi Akasaka
PublisherSPIE
ISBN (Electronic)9781510642591
DOIs
StatePublished - 2021
EventMetro and Data Center Optical Networks and Short-Reach Links IV 2021 - Virtual, Online, United States
Duration: Mar 6 2021Mar 11 2021

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11712
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceMetro and Data Center Optical Networks and Short-Reach Links IV 2021
CountryUnited States
CityVirtual, Online
Period3/6/213/11/21

Keywords

  • 400G CWDM transmission
  • 800G
  • DAC/ADC resolution
  • PAM4
  • PM-16QAM
  • PM-32QAM
  • PM-64QAM
  • PS distribution
  • coherent detection

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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