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Implementation of an optical wireless communication system deploying a novel post‐equalization circuit for indoor application

This paper experimentally demonstrates an optical wireless communication (OWC) system with commercially available LED and PD for lighting purpose by optimizing the performance of the OWC system with a newly proposed post‐equalization circuit. We used non‐return to zero (NRZ) on‐off keying (OOK) modulating at 622 Mbps with operating carrier wavelength of 636 nm, which corresponds to red visible light. The free space transmission length of the system was set at 50 cm and the LED emitted 9.1 lx. Different post‐equalization gains were tested to optimize proposed post‐equalization circuit by using the frequency response characteristics at different modulating frequencies and the bit‐error rate (BER) of the OWC system. For the optimized case, we were able to achieve error‐free transmission at 622 Mbps and a maximum achievable data rate of 636.6 Mbps with a BER of 9.9 × 10−6.