Abstract

The feasibility of a time-domain technique, proposed for uplink synchronization of the bandwidth scalable orthogonal frequency division multiple access passive optical network (BS-OFDMA PON), is experimentally demonstrated. The results show that a delay variation of less than 50% of the cyclic prefix is tolerable, relaxing the thin time synchronization required in the uplink of the evaluated architecture. Moreover, we enhance the spectral efficiency of the BS-OFDMA PON by reducing the guard band (${B_g}$) between the optical carrier and the signal bandwidth, as well as by eliminating the frequency gap (${\Delta _{{f_G}}}$) between the optical network units. The downlink results demonstrate that ${\Delta _{{f_G}}}$ can be eliminated with negligible performance penalties, and ${B_g}$ can be reduced to almost half the signal bandwidth. Error-free transmissions were achieved after uplink propagation over 45 km of single-mode fibers with received power of ${\approx}{-}{16.8}\;{\rm{dBm}}$ and ${B_g} = 450\;{\rm{MHz}}$, with a signal bandwidth of 1 GHz.

© 2021 Optical Society of America

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