Abstract
Violet laser diode (VLD) based white-light source with high color rendering index (CRI) for lighting communication is implemented by covering with Y3Al5O12:Ce3+ (YAG:Ce) or Lu3Al5O12:Ce3+/CaAlSiN3:Eu2+ (LuAG:Ce/CASN:Eu) phosphorous diffuser plates. After passing the beam of VLD biased at 70 mA (~2Ith) through the YAG:Ce phosphorous diffuser, a daylight with a correlated color temperature (CCT) of 5068 K and a CRI of 65 is acquired to provide a forward error correction (FEC) certified data rate of 4.4 Gbit/s. By using the VLD biased at 122 mA (~3.5Ith) to excite the LuAG:Ce/CASN:Eu phosphorous diffuser with 0.85-mm thickness, a warm white-light source with a CCT of 2700 K and a CRI of 87.9 is obtained at a cost of decreasing transmission capacity to 2.4 Gbit/s. Thinning the phosphor thickness to 0.75 mm effectively reduces the required bias current by 32 mA to achieve the same CCT for the delivered white light, which offers an enlarged CRI of 89.1 and an increased data rate of 4.4 Gbit/s. Further enlarging the bias current to 105 mA remains the white-light transmission capacity at 4.4 Gbit/s but reveals an increased CCT of 3023 K and an upgraded CRI of 91.5.
Highlights
With the rapid development of self-sustainable green-smart houses, visible light communication (VLC), optical wireless communication (OWC) and light fidelity (Li-Fi) have attracted much attention as indoor users always demand huge data capacity and multi-functional lighting control during daily life[1, 2]
Note that the transmission capacity as high as 12 Gbit/s is guaranteed for the violet laser diodes (LDs) (VLD) based 7-m PtP VLC system
With adhering the LuAG:Ce/CASN:Eu or YAG:Ce phosphorous diffuser to the VLD, the high-color rendering index (CRI) white-lighting and high-spectral-usage data transmission can meet the demand of smart lighting communication for green housing applications
Summary
With the rapid development of self-sustainable green-smart houses, visible light communication (VLC), optical wireless communication (OWC) and light fidelity (Li-Fi) have attracted much attention as indoor users always demand huge data capacity and multi-functional lighting control during daily life[1, 2]. The high-order CAP modulation and hybrid post equalization helps the red/blue/green/yellow (RBGY)-LED based WDM-VLC to approach 8-Gbit/s free-space transmission over 1 m31. By employing bit-rate adaptive OFDM scheme, Chun et al used RC R-LED and B/G-μLEDs to demonstrate WDM-VLC transmission up to 11.28 Gbit/s34. Janjua et al demonstrated a RGB LDs based 20-cm-long WDM-VLC with data rate beyond 4 Gbit/s52, and the proposed white light exhibits a correlated color temperature (CCT) of 5835 K. Therein the white light generated by illuminating the blue light through the yellow phosphor becomes a more compact and cost-effective solution than the RGB mixed white-light source with higher transmission capacity Such a drawback can be alleviated by carrying high-spectral-efficiency data formats such as high-level quadrature amplitude modulation (QAM)-OFDM65, 66. The VLD based lighting communication has yet to be discussed to date
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