In this manuscript, an approach for generation of flattened optical frequency comb (OFC) by using four wave mixing (FWM) effect in wideband Semiconductor optical amplifier (SOA) is proposed. The performance of proposed OFC has been analysed in presence of multi-tone RF modulated signal. The wideband SOA produces a comb-like spectrum comprised of numerous closely spaced frequency components by modulating the input light wave with a single frequency and interaction of these light waves inside the amplifier produced new frequency components. The proposed optical network is proficient for generating 58 comb lines with 2 dB maximum power deviation in which 28, 19 and 11 frequency comb lines having 2 dB maximum power deviation. The impact of confinement factor, injection current and carrier density of wideband SOA is investigated to get variations in optical frequency comb lines and maximum power deviation. This flattened OFC has advanced application in passive optical network as well as in optical sensing and it can act as multichannel source in high performance optical networks.