The demand for high transmission rates and dependable communication drive the optical Multi-carrier modulation technique to be an appealing method owing to its broad spectrum particularity. In this paper, hybrid optical OFDM is evaluated and discussed for LOS and NLOS channel models. The perfect signal shaping characterized by optimal biasing and scaling at the transmitter/receiver sides within the optical power limitations plays a significant role in system performance. Consequently, the minimum needed energy bit/noise bit (Eb/N0) to preserve a required bit-error rate is achieved for a selected multi-layer modulation system and a specified variety of optical power limitations. Simulation results demonstrated the minimisation of the BER could be obtained by reducing the ambient noise vai adopting an extra process stage at the receiver, notably, at the transmitter side. The outcomes were presented in terms of two channels. Upon utilising the identical bit rate of all scenarios, we have found that the equalisation could enhance the overall system performance with MMSE values outperforming the ZF equaliser by SNR of 5 dB at the specific bit-error-rate of 0001.

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