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White Light Color Conversion with Red/Green/Violet-mLDs and Yellow-LED Mixing for 30 Gbps Visible Lighting Communication

Photonics Research
  • Wei-Chun Wang, Chih-Hsien Cheng, Huai-Yung Wang, and Gong-Ru Lin
  • received 02/25/2020; accepted 05/03/2020; posted 05/04/2020; Doc. ID 391431
  • Abstract: The visible wavelength division multiplexing (VWDM) optical wireless communication (OWC) beyond 30 Gbit/s with a white-light beam mixed by red/green/violet (R/G/V) LDs and yellow (Y) LED is demonstrated via 32-level QAM discrete multitone modulation. To faciliate both high-quality indoor lighting and high-speed optical wireless communication, the R/G/V-LD white-light module incorporates with a Y-LED to provide high color rendering index (CRI) and encapsulates with a frosted glass to enlarge its divergent angle. By respectively encoding the R/G/V LDs with the filtered 16-quadrature amplitude modulation discrete multi-tone (16-QAM DMT) data in back-to-back case, the total raw data rate as high as 34.8 Gbit/s is achieved by encoded R/G/V LDs with respective VWDM data rates of 18/7.2/9.6 Gbit/s. To fulfill the demanded CRI and correlated color temperature (CCT) for indoor white-lighting, the yellow LED contributes the yellowish-orange luminescence with flexible CCT and CRI varying from 3952K to 3031K and from 0 to 45.9, respectively. Cold white-light carrier at CCT of 4852K, CRI of 71.6 and CIE of (0.3652, 0.4942) is also approached with attenuating the red LD power, such a cold white-light spot with illuminance of 6800 lux and divergent solid angle (Ω) of 0.89 steradian (sr) can support VWDM data transmission at 28.4 Gbit/s.
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