title: Going beyond 4 Gbps data rate by employing RGB laser diodes for visible light communication.
abstract: 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.
authors.forename: Bilal
authors.initials: B
authors.lastname: Janjua
authors.forename: Hassan M
authors.initials: HM
authors.lastname: Oubei
authors.forename: Jose R
authors.initials: JR
authors.lastname: Durán Retamal
authors.forename: Tien Khee
authors.initials: TK
authors.lastname: Ng
authors.forename: Cheng-Ting
authors.initials: CT
authors.lastname: Tsai
authors.forename: Huai-Yung
authors.initials: HY
authors.lastname: Wang
authors.forename: Yu-Chieh
authors.initials: YC
authors.lastname: Chi
authors.forename: Hao-Chung
authors.initials: HC
authors.lastname: Kuo
authors.forename: Gong-Ru
authors.initials: GR
authors.lastname: Lin
authors.forename: Jr-Hau
authors.initials: JH
authors.lastname: He
authors.forename: Boon S
authors.initials: BS
authors.lastname: Ooi