Abstract
Data communication based on white light generated using a near-ultraviolet (NUV) laser diode (LD) pumping red-, green-, and blue-emitting (RGB) phosphors was demonstrated for the first time. A III-nitride laser diode (LD) on a semipolar (2021¯) substrate emitting at 410 nm was used for the transmitter. The measured modulation bandwidth of the LD was 1 GHz, which was limited by the avalanche photodetector. The emission from the NUV LD and the RGB phosphor combination measured a color rendering index (CRI) of 79 and correlated color temperature (CCT) of 4050 K, indicating promise of this approach for creating high quality white lighting. Using this configuration, data was successfully transmitted at a rate of more than 1 Gbps. This NUV laser-based system is expected to have lower background noise from sunlight at the LD emission wavelength than a system that uses a blue LD due to the rapid fall off in intensity of the solar spectrum in the NUV spectral region.
Highlights
Visible light communication (VLC) has gained momentum in recent years due to concerns about bandwidth limitations for radio frequency (RF) based communication systems
III-nitride laser diodes (LDs) have been considered as a promising alternative to address the bandwidth limitations in light emitting diodes (LEDs), with VLC systems using LDs demonstrating multi Gigabit data rates [15,16,17,18,19]
Since the dynamics of LDs are dominated by the photon lifetime rather than the carrier lifetime, LDs have much higher modulation bandwidths (> 5 GHz) than LEDs [20]
Summary
Visible light communication (VLC) has gained momentum in recent years due to concerns about bandwidth limitations for radio frequency (RF) based communication systems. Many studies have shown significant progress in VLC by using III-nitride based light emitting diodes (LEDs) as a transmitter [1,2,3,4,5,6,7]. III-nitride laser diodes (LDs) have been considered as a promising alternative to address the bandwidth limitations in LEDs, with VLC systems using LDs demonstrating multi Gigabit data rates [15,16,17,18,19]. In addition to high-speed performance, LDs show promise for solid-state lighting applications because they operate at higher current densities and have higher output powers per unit wafer area than LEDs [21,22]. LDs can be utilized for light fidelity (LiFi) networks, underwater wireless optical communications (UWOC), and plastic optical fiber (POF) communications [27,28]
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