This paper presents a sampling frequency offset (SFO) estimation and compensation method based on frequency domain correlation of long training symbols for OFDMA-PON. The method is of high accuracy and low complexity.

The presented synchronization method shows excellent performances in experimental transmissions of both continuous- and burst-mode.

For a certain SFO, in continuous-mode transmission, proposed scheme can perform effectively in a wide received optical power range from −8 dBm to −2 dBm and has high estimation veracity and a large applicable range.

Similar behavior is also demonstrated under burst-mode transmission with tiny performance degradation caused by the fact that the algorithm needs time to reach a stable status of synchronization.