In this paper, we will focus on the modulation format used to produce the optical pulses, which are return to zero (RZ), and non-return to zero (NRZ). Bit error rate (BER) performance is assessed for OCDMA-RoF system. OCDMA-RoF system is viewed as a promising method for improving spectral efficiency and in the meantime diminish hardware equipment. The execution of RZ against NRZ is looked at through software simulation. We utilized two systems designed as follows: the first system used a RZ pulse generator and the second system used is NRZ pulse generator, and both frameworks were tried with 8 Optical Line Terminal (OLT) at the transmitter and 8 Optical Network Units (ONU) at the receiver without an erbium doped fiber amplifier (EDFA). It has been found that the NRZ pulse generator in this framework is prevalent than the RZ pulse generator for all re-enactment results. The performances are described through the received power at various bit rates and also an RF spectrum signal of NRZ and RZ format.