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Feed-forward pre-equalization is investigated to extend the transmission capability of μLED-based links, providing better receiver sensitivities up to 5dB compared with post-equalization. Error-free 2Gb/s free-space VLC over 0.6m is demonstrated using a PAM-4 modulated blue μLED and an APD receiver.
The use of an APD-based receiver in a PAM-16 4 Gb/s LED-POF link is shown to provide 10 dB greater link power budget over a PIN photodiode link. Error-free transmission is achieved over 25m SI-POF.
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