Nonlinearity Mitigation of Multi-Level Optical Transmission Using Spectrum-Split Digital Pre-Distortion

Gyu Tai Lim, Hyoung Joon Park, Sang Kook Han

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


To overcome the frequency-dependent nonlinear characteristics of a directly modulated laser (DML) in a multi-level optical transmission, the spectrum-split digital pre-distortion (SS-DPD) is proposed and experimentally demonstrated to mitigate the frequency-dependent nonlinear impairments. The SS-DPD is employed in a 5 Gb/s PAM-4 optical transmission using a DML over a 5 km standard single-mode fiber at 1550 nm. We experimentally compared the SS-DPD with the DPDs based on the Volterra series and the memory polynomial (MP). The results demonstrate that the SS-DPD improved approximately 1 dB in terms of the receiver sensitivity compared with the MP-DPD. Moreover, the SS-DPD achieves 0.4 dB receiver sensitivity gain compared with the Volterra DPD.

Original languageEnglish
Article number8930915
JournalIEEE Photonics Journal
Issue number1
Publication statusPublished - 2020 Feb

Bibliographical note

Funding Information:
Manuscript received October 24, 2019; revised December 3, 2019; accepted December 6, 2019. Date of publication December 11, 2019; date of current version January 7, 2020. This work was supported by the Institute for Information and Communications Technology Promotion (IITP) under Grant 2019-0-00685, funded by the Korean government (MSIT) (Free space optical communication based vertical mobile network). Corresponding author: Sang-Kook Han (e-mail:

Publisher Copyright:
© 2020 IEEE.

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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