| 摘要 |
The invention relates to an optical WDM transmission network (1, 1') comprising at least one optical line terminal (3, 3'), a remote node (5, 5') and a plurality of optical network units (7, 7'), the at least one optical line terminal (3, 3') being connected to the optical remote node (5, 5') via an optical WDM path (11), each optical network unit (7, 7') being connected to the optical remote node (5, 5') via an optical distribution path (15), and the optical remote node (5, 5') having connection ports for connecting the at least one optical line terminal (3, 3') and the plurality of optical network units (7, 7') to the optical remote node (5, 5'), the optical remote node (5, 5') having wavelengthdepending routing properties being configured in such a way that bidirectional hub links via the optical remote node (5, 5') between the at least one optical line terminal (3, 3') and each of the optical network units (7, 7') can be established and being further configured in such a way that direct bidirectional star links via the optical remote node (5, 5') between one or more selected optical network unit (7, 7') and at least one of the other optical network unit (7, 7') can be established, the wavelength-dependent routing properties being essentially identical in a first (b 1 ), a second (b 2 ) and a third (b 3 ) optical band, the first, second and third optical band (b 1 , b 2 , b 3 ) having no overlap, wherein, for establishing the hub links, the at least one optical line terminal (3, 3') creates optical downstream channel signals (S DS ) at first wavelengths (» j ) lying in the first optical band (b 1 ) and each of selected one or more optical network units (7, 7') creates an optical upstream channel signal (S US ) at a dedicated second wavelength (» j ) lying in the second optical band (b 2 ) and wherein, for establishing the direct star links, each of selected one or more optical network units (7, 7') creates an optical star link channel signal (» j ) at a dedicated third wavelength lying in the third optical band. The invention is characterized in that each or selected optical network units (7, 7') further comprise a first optical band filter device (35) having a common port and a first and a second band port, a first optical receiver (37) connected to the first band port and a second optical receiver (39) coupled to the second band port, the first optical receiver (37) being adapted to receive an optical downstream channel signal (S j ) lying in the first band (b 1 ) for establishing a hub link and the second optical receiver (39) adapted to receive an optical channel signal (S j ) lying in the second band (b 2 ) for establishing a direct star link, wherein the optical band filter device (35) is configured to route an optical channel signal supplied to the common port and lying in the first optical band to the first band port and to route an optical channel signal supplied to the common port and lying in the third optical band to the second band port. |
