by Luc Maret, Research Engineer in Wireless Communications, CEA-Leti, technology research institute

We present a broadband free space light communication using high-speed micro organic light emitting diode (OLED) as transmitter. We report first the design and bandwidth measurements of innovative OLEDs whose size are in the range of tens of micrometres. For OLEDs with reduced active area such as 40 µm x 40 µm, a cut-off frequency up to 345 MHz is reached. Then a free-space optical wireless link is build based on these high-speed micro-OLED. Using Direct Current Optical-Orthogonal Frequency Division Multiplexing) with adaptive bit and energy loading, we achieve a data rate of 2.85 Gb/s.

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