| 主权项 |
1. An optical transmission system, comprising:
a central management and switching device; a ring-shaped metro core network running in a wavelength multiplex mode, the ring-shaped metro core network including a plurality of wavelength-selective metro connection devices including wavelength converters and/or data regenerators; and a plurality of bi-directional passive optical access connections between the metro connection devices of the ring-shaped metro core network and optical network units attached in each case via an optical splitter which communicate logically directly with the central management and switching center via a time division multiplex operation for passive optical networks, wherein the metro connection devices are adapted to, in each case, select, regenerate, and transmit one of the metro downstream signals as an access downstream signal on an access connection between the metro connection devices of an access connection and the optical network units, the access connection including no active components, wherein the optical network units are adapted to transmit access upstream signals having the same wavelengths or wavelengths that are selectable within a transmission band over the access connections, and wherein the metro connection devices are adapted to regenerate the access upstream signals and, in terms of the wavelengths, convert the access upstream signals into metro upstream signals and then transmit the metro upstream signals in the metro core network to the management and switching device. |
