How to Let XGS-PON XGPON GPON work together

Since the uplink/downlink wavelengths are different from GPON, XGS-PON uses the Combo scheme to share ODN with GPON. XGS-PON’s Combo optical transceiver integrates GPON optical transceiver, XGS-PON optical transceiver, and WDM combiner.

In the uplink direction, after the optical signal enters the XGS-PON Combo port, the WDM filters the GPON signal and the XGS-PON signal according to the wavelength, and then sends the signal into different channels.
In the downstream direction, the signal from the GPON channel and the XGS-PON channel is multiplexed by WDM, and the mixed signal is downlink to the ONU through ODN, and because the wavelength is different, different types of ONUs select their desired wavelengths through internal filters to receive the signal.

Since XGS-PON inherently supports coexistence with XG-PON, the Combo solution for XGS-PON supports mixed access of three types of ONUs: GPON, XG-PON, and XGS-PON. The Combo optical module for XGS-PON is also referred to as a tri-mode Combo optical module (whereas the Combo optical module for XG-PON, which supports mixed access of GPON and XG-PON ONUs, is referred to as a dual-mode Combo optical module).