46.4 Gbps visible light communication system utilizing a compact tricolor laser transmitter

Area of Science:

• Optoelectronics
• Wireless Communication Technologies
• Photonics

Background:

• Visible Light Communication (VLC) offers advantages like high data rates and freedom from electromagnetic interference.
• Laser Diodes (LDs) are increasingly important for high-speed VLC due to their superior modulation bandwidth.
• Existing VLC systems face challenges in achieving ultra-high data rates and spectral efficiency.

Purpose of the Study:

• To demonstrate a novel Red/Green/Blue (R/G/B) laser diode (LD) based Visible Light Communication (VLC) system.
• To achieve a data rate exceeding 40 Gbps using advanced modulation and bit-loading techniques.
• To analyze the performance and emission characteristics of R/G/B-LDs in a high-speed VLC context.

Main Methods:

• Implementation of a VLC system utilizing R/G/B laser diodes as light sources.
• Employment of Discrete Multitone (DMT) modulation for efficient data transmission.
• Application of adaptive bit-loading technology to optimize spectral efficiency (SE).

Main Results:

• A record data rate of 46.41 Gbps was achieved in the R/G/B-LD based VLC system.
• Optimal data rates for individual R/G/B channels were determined as 17.168 Gbps, 14.652 Gbps, and 14.590 Gbps.
• Bit-error-ratios (BER) for all channels met the 7% forward-error-correction (FEC) threshold, approaching the Shannon limit.

Conclusions:

• R/G/B laser diodes are highly effective light sources for achieving ultra-high-speed VLC.
• The combination of DMT and adaptive bit-loading significantly enhances spectral efficiency in VLC systems.
• The demonstrated system performance validates the potential of LD-based VLC for future high-capacity wireless communication.