Abstract
White light generation by mixing red, green, and blue laser diodes (RGB LDs) was demonstrated with Commission International de l’Eclairage coordinates of (0.2928, 0.2981), a correlated color temperature of 8382 K, and a color rendering index of 54.4 to provide a maximal illuminance of 7540 lux. All the white lights generated using RGB LDs were set within the risk group-1 criterion to avoid the blue-light hazard to human eyes. In addition, the RGB-LD mixed white light was diffused using a frosted glass to avoid optical aberration and to improve the performance of the lighting source. In addition, visible light communication (VLC) by using RGB-LD mixed white-light carriers and a point-to-point scheme over 1 m was performed in the directly modulated 16-QAM OFDM data format. In back-to-back transmission, the maximal allowable data rate at 10.8, 10.4, and 8 Gbps was determined for R, G, and B LDs, respectively. Moreover, the RGB-LD mixed white light-based indoor wavelength-division multiplexing (WDM)-VLC system yielded a total allowable transmission data rate of 8.8 Gbps over 0.5 m in free space. Such a high-speed RGB-LD mixed WDM-VLC system without any channel interference can be used to simultaneously provide data transmission and white lighting in an indoor environment.
Highlights
White light generation by mixing red, green, and blue laser diodes (RGB LDs) was demonstrated with Commission International de l’Eclairage coordinates of (0.2928, 0.2981), a correlated color temperature of 8382 K, and a color rendering index of 54.4 to provide a maximal illuminance of 7540 lux
The 16-quadrature amplitude modulation (QAM)-orthogonal frequency division multiplexing (OFDM) data transmitted at 10.8 Gbps by a single red LD exhibited an average error vector magnitude (EVM), signal-to-noise ratio (SNR), and BER of 16.6%, 15.6 dB, and 2.6 × 10−3, respectively
The Commission International de l’Eclairage (CIE) coordinates and correlated color temperature (CCT) of the tricolor RGB-LD-generated white light were (0.2928, 0.2981) and 8382 K, respectively, and the CCT of white light was further decreased to 7275 K by adhering an 0.3-optical density (OD) filter on the blue LD output
Summary
White light generation by mixing red, green, and blue laser diodes (RGB LDs) was demonstrated with Commission International de l’Eclairage coordinates of (0.2928, 0.2981), a correlated color temperature of 8382 K, and a color rendering index of 54.4 to provide a maximal illuminance of 7540 lux. The RGB-LD mixed white light-based indoor wavelength-division multiplexing (WDM)-VLC system yielded a total allowable transmission data rate of 8.8 Gbps over 0.5 m in free space. In 2013, Wang et al presented an RGB-LED white-lighting source based WDM-VLC system with a total transmission data rate of 575 Mbps over 66 cm by employing the quadrature amplitude modulation (QAM)-orthogonal frequency division multiplexing (OFDM) with high spectral usage efficiency[15]. A tricolor set of RGB LDs was established to construct an indoor white-lighting WDM-VLC system with an allowable transmission raw data rate of 8.8 Gbps in total, and a maximal transmission distance of 0.5 m with forward-error correction (FEC) qualifications was demonstrated. The variation in maximal allowable transmission capacity of the blue LD with changing CCT of the RGB-LD generated white light was comprehensively analyzed
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