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Damian Marek

You cannot transmit the pilot tones down the fiber length because they will become distorted and essentially useless as a reference for the receiver. The output of the pilot tones on the OFDM Modulation should be directly connected to the OFDM Demodulation. This models the fact that in a real system the receiver knows the pilot tones beforehand and can adjust the detected pilot tone signal with the known pilot tones.