VCSEL and LED Based Visible Light Communication System by Applying Decode-and-Forward Relay Transmission

Chien-Hung Yeh, Yun-Cheng Yang, Chi Wai Chow, Yu-Wen Chen, Tzu-An Hsu

Research output: Contribution to journalArticlepeer-review


In this investigation, we propose and demonstrate an integrated vertical-cavity surface-emitting laser (VCSEL) and blue light emitting diode (LED) based visible light communication (VLC) system by using the decode-and-forward (DF) relay scheme indoors. The 682 nm visible VCSEL can reach 3 Gbit/s on-off keying (OOK) modulation rate for 4 m free space transmission by applying 1.25 GHz bandwidth PIN photodiode (PD). Then, the VLCVCSEL signal connects to multiple blue LEDs for broadcasting VLCLED traffic in parallel. Therefore, the maximum VLCLED rates of 775, 700, and 600 Mbit/s are obtained at the free space transmission lengths of 2, 3, and 4 m, respectively within the forward error correction (FEC) target under 4 m VLC transmission at the low detected power of 15 mu W. In addition, the number of LEDs used in the DF relay VLC system depends on the practical requirement of VLCLED rate and traffic length indoors.

Original languageEnglish
Pages (from-to)5728-5732
Number of pages5
JournalJournal of Lightwave Technology
Issue number20
StatePublished - 15 Oct 2020


  • Light emitting diodes
  • Vertical cavity surface emitting lasers
  • Wireless communication
  • Relays
  • Visible light communication
  • Modulation
  • Forward error correction
  • Decode-and-forward (DF)
  • LED
  • on-off keying (OOK)
  • visible light communication (VLC)
  • VLC

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