Comparison of VSB PAM4 and OOK Signal in an EML-Based 80-km Transmission System

Hsing-Yu Chen, Jeffrey Lee, Noriaki Kaneda, Jyehong Chen, Young-Kai Chen

Research output: Contribution to journalArticleAcademicpeer-review

13 Citations (Scopus)


A comparison between 51.84-Gb/s vestigial sideband 4-level pulse amplitude modulation (PAM4) and ON-OFF keying (OOK) signals at a transmission distance of 80 km is experimentally demonstrated for the first time. An electro-absorption modulated laser-based intensity-modulation and direct-detection 80-km transmission is achieved using both modulation formats without dispersion compensating fiber. The relative frequency between single sideband filter and signal is adjusted to find an optimized condition for both carrier to signal power ratio and sideband suppression ratio. The experimental results show that with linear equalization and without bandwidth limitation, the OOK signal has a 4-dB better sensitivity compared with PAM4 after 80-km standard single-mode fiber transmission.

Original languageEnglish
Article number8070385
Pages (from-to)2063-2066
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number23
Publication statusPublished - 1 Dec 2017
Externally publishedYes


  • amplitude shift keying
  • Intensity modulation
  • optical interconnections
  • optical modulation format


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