Wavelength Division Multiplexing (WDM) multiplexes a number of optical signals at different wavelengths in a single optical fiber. Each optical signal comprises a separate channel, and thus the information capacity per channel is bounded by the modulation speed of the transmitter. Therefore, the engineering parameters that determine the complexity of the fiber span and cost of transporting data depend on the number of channels, channel spectral separation, optical power per signal, bit rate, type of fiber and length of fiber link. Based on these, a determination is made if amplification and what type is needed, if dispersion (chromatic, polarization) is significant, if other non-linear effects are considerable, and in general if there are mitigating parameters that affect the integrity and quality of signal. In this paper we present a parallel transmission WDM method by which high-bandwidth throughput is achieved yet with low modulation bitrates and low power source lasers. This method minimizes dispersion and other nonlinear phenomena over a given span, it greatly enhances the quality of signal, it increases transmission reliability and reduces cost per transported bandwidth in short and mediumhaul, Metro and point-to-point, DWDM applications.