Single subcarrier gold sequences modulated timing synchronization for upstream OFDMA-PON

We propose a symbol synchronization scheme based on Gold sequences modulated on a single pilot subcarrier for the OFDMA-PON. The IMDD real-time experimental demonstrations are carried out with two ONUs and one OLT. The results show that the accurate symbol synchronization can be achieved at received optical power of -21dBm on the condition of SFO range from 0ppm to 70ppm between two ONUs.