Rapidly-increasing traffic demands would require the upgrade of optical access networks, especially deployed Passive Optical Networks (PONs), which can face capability exhaustion. Such upgrade options must consider several technical and cost factors for evolution toward a shared multiple-channel PON using Wavelength Division Multiplexing (WDM). WDM will facilitate the seamless upgrade of PON since capabilities are often increased by adding new wavelength channels. These factors act as the driving factors for the expansion of the world Passive Optical Network Chipset Market.