Hi Alistu,
thanks for your reply, please may I have more information about OFDMA.
I agree with you about OFDMA, we should use one block OFDM modulation with multi-ports at the OLT or CO, but if we use the same concept at the ONUs (which is one block OFDMA demodulation) that means we have to split the signals after the OFDM demodulation (in the electrical mode, not in optical mode). I think this is not full FTTH, because the optical to electrical converter and OFDM demodulation happened before the fiber reach the end users (homes or ONUs). Am I right or not?