Wavelength division multiplexed passive optical access network (WDM-PON) is anticipated to provide desirable data rates to maximum number of subscribers. However, the use of highly coherent lasers at optical line terminal (OLT) and optical network unit (ONU), limits the deployment of WDM-PON at access domain. This paper proposes an efficient architecture for the implementation of WDM PON by using multi-carrier generation at OLT. A 2.5 Gbps DPSK Signal is implemented at OLT, whereas ON /OFF keying (OOK) scheme is utilized at ONUs for upstream transmission. Simulation analysis using Optisystem shows that the proposed system is able to provide high data symmetric transmission up to 2.5 Gbps. Thus, the proposed multicarrier WDM-PON is cost effective and scalable, and it is successfully verified according to feasibility.