Going beyond 4 Gbps data rate by employing RGB laser diodes for visible light communication

Bilal Janjua, Hassan Oubei, Jose Ramon Duran Retamal, Tien Khee Ng, Cheng Ting Tsai, Huai Yung Wang, Yu Chieh Chi, Hao Chung Kuo, Gong Ru Lin, Jr-Hau He, Boon Ooi

Research output: Contribution to journalArticlepeer-review

103 Scopus citations


With increasing interest in visible light communication, the laser diode (LD) provides an attractive alternative, with higher efficiency, shorter linewidth and larger bandwidth for high-speed visible light communication (VLC). Previously, more than 3 Gbps data rate was demonstrated using LED. By using LDs and spectral-efficient orthogonal frequency division multiplexing encoding scheme, significantly higher data rates has been achieved in this work. Using 16-QAM modulation scheme, in conjunction with red, blue and green LDs, data rates of 4.4 Gbps, 4 Gbps and 4 Gbps, with the corresponding BER/SNR/EVM of 3.3 × 10 -3 /15.3/17.9, 1.4 × 10 -3 /16.3/15.4 and 2.8 × 10 -3 /15.5/16.7were obtained over transmission distance of ∼20 cm. We also simultaneously demonstrated white light emission using red, blue and green LDs, after passing through a commercially available diffuser element. Our work highlighted that a tradeoff exists in operating the blue LDs at optimum bias condition while maintaining good color temperature. The best results were obtained when encoding red LDs which gave both the strongest received signal amplitude and white light with CCT value of 5835K.

Original languageEnglish (US)
Pages (from-to)18746-18753
Number of pages8
JournalOptics Express
Issue number14
StatePublished - Jul 13 2015

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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