We report on experimental demonstration of 2x2 MIMO-OFDM 5.6-GHz radio over fiber signaling over 20 km WDM-PON with directly modulated (DM) VCSELs for femtocells application. MIMO-OFDM algorithms effectively compensate for impairments in the wireless link. Error-free signal demodulation of 64 subcarrier 4-QAM signals modulated at 198.5 Mb/s net data rate is achieved after fiber and 2 m indoor wireless transmission. We report BER of 7x10−3 at the receiver for 16-QAM signals modulated at 397 Mb/s after 1 m of wireless transmission. Performance dependence on different wireless transmission path lengths, antenna separation, and number of subcarriers have been investigated.
Binti Othman, M., Deng, L., Pang, X., Caminos, J., Kozuch, W., Prince, K., ... Tafur Monroy, I. (2011). MIMO-OFDM WDM PON with DM-VCSEL for femtocells application. Optics Express, 19(26), B537-B542. https://doi.org/10.1364/OE.19.00B537