The invention relates to an optical ring network comprising stations (340) which are connected to at least one optical fiber by means of optical couplers, the two ends of the optical fiber being connected to a point of presence or an optical network access node. The point of presence comprises (k) at least an optical emitter (330-1) which emits a falling optical signal having at lest one first wavelength (420) in the direction of one end of the optical fibers (455) and (ii) at least one optical receiver (330-2) which receives a rising optical signal having at least one second wavelength which is different form the first wavelength. The aforementioned optical network access node comprises means such as a hub (320) which can be used for the communication between the optical receiver (330-2) and the optical emitter (330-1). The wavelengths of the rising signals and the wavelengths of the falling signals are shared by several stations.