The invention is related to the field of telecommunications, more specific to sector of active wavelength division multiplexed access optical systems (WDM-AON) where each of end users need a light source with a certain wavelength. Accordingly, as the number of end-users increases, it is necessary to increase the number of light emitting sources. Therefore, in the optical access networks which are characterized by the tree type branching topology very promising are light sources, which allow to generate multiple wavelengths at the same time, each of them further used for data transmission. Accordingly the number of active components in the transmission system is decreasing and its reliability is improving.The aim of invention is to reduce the number of light sources (lasers or light diodes) used in the transmitter part of WDM-AON system, at the same time not reducing the number of channels used for data transmission. To increase the efficiency of each light source and provide the possibility to use single light source for more than one data signal transmission, the WDM-AON access system with multichannel light source is offered, which is established by using optical parametric amplifier with two pump light sources and highly nonlinear optical fiber. Such a solution showed in fig.1 allows to amplify the power of initial lasers light, at the same time doubling the number of transmission channels.