Manuscript originally submitted to the repository as for publication by IEEE in the papers of the International Conference On Communication Problem-Solving (ICCP2014). However, it does not appear among the published papers for this conference, and no reference has been found to it being published elsewhere.Plastic optical fiber (POF) data links have been widely viewed as a cost- and energy- effective solutions for short-reach Gigabit data communications such as in-home and automotive networks. POF also has excellent compatibility with low-cost light-emitting-diodes (LEDs). In this paper, we demonstrate a 4 Gb/s single micro-LED (μLED) PAM-16 link and a record 4.7 Gb/s multiple μLEDs PAM-8 link by 1) use of avalanche photodiodes (APD) in combination with high order modulation formats; and 2) illumination of multiple μLEDs. Both digital implementation based on FPGA and analogue implementation are considered for real-time transmitters
