For growing transmitting capability over fixed bandwidth, there are many potential techniques that had been developed in the recent years. There are several possible methods for increasing transmission capacity over fixed bandwidth. One of the most effective methods that can offer achieving more information is orthogonal frequency division multiplexing (OFDM). We designed a powerful simulation framework for a backhaul RoF-MMW optical transmission system between main base station and remote antenna unit based on multi-carrier OFDM modulation. The powerful simulation of next generation optical MC-OFDM transportation along RoF-MMW long transmission system had been successfully implemented. By using 50 Gb/s default bit rate and 128 QAM modulation format for OFDM-RoF-MMW system along 50 km, the best achievement of overall bit rate obtained (11.2 Tb/s) with accepted BER to get ultra-high-capacity transmission system. Thanks to the python DSP and the losses compensators used in the simulation framework, the PAPR losses and drift in the receiver section had been compensated and many values of OFDM sub-carriers (16 and 32 OFDM sub-carriers) achieved for ultra-high-capacity transmission system.