Abstract: A wavelength division multiplexed optical fiber subscriber network capable of expanding the number of subscribers. In the optical fiber subscriber network, a central office allocates a unique combination of optical wavelengths to a subscriber upon receipt of a service request signal from the subscriber, wavelength division multiplexes requested information together with the combined optical wavelength and the transmits the wavelength, division multiplexed optical wavelength through an optical fiber. A plurality of optical subscriber devices optically distributes, filters and combines the wavelength division multiplexed optical signals received through the optical fiber to select optical wavelengths allocated thereto, and outputs the selected optical wavelengths to corresponding subscriber terminals.

Abstract: A wavelength division multiplexed optical fiber subscriber network capable of expanding the number of the subscribers. In the optical fiber subscriber network, a central office allocates a unique combination of optical wavelengths to a subscriber upon receipt of a service request signal from the subscriber, a wavelength division multiplexing service requested information together with the combined optical wavelength, and transmits the wavelength division multiplexed optical wavelength through an optical fiber. A plurality of optical subscriber devices optically distributes, filters and combines the wavelength division multiplexed optical signals received through the optical fiber to select optical wavelengths allocated thereto and outputs the selected optical wavelengths to corresponding subscriber terminals.

Abstract: As stated above, since the control, according to different types of service traffics, is executed by detecting the congestion state by output buffers, whose numbers is fixed, of the network node, the present invention can remove a load of hardware which may be caused by the variable number of virtual connections in case of executing the congestion by the virtual connections. Therefore, the present invention has the effect of simplification of circuitry implement. Also, the present invention can exclude out of the network node the possibility of the congestion which can be generated by the transmission delay, because the congestion state in the network node is determined concerning the transmission delay.