| 摘要 |
An add/drop node of an optical WDN-network which has two fiber paths for light of a plurality of channels propagating in opposite directions comprises two add/drop modules ( 231, 23 r) for each of the channels. All the modules are identically constructed. Each module comprises an add device ( 251, 25 r) for adding light to one of the paths and a drop device ( 27 r, 271 ) for deflecting a portion of light from a second one of the paths. A module comprises a house ( 41 ) enclosing the add device and the drop device. A first fixed connector ( 53, 73 ) is attached to the house for connection in the first path and to a an optical fiber ( 45, 65 ) which extends freely from the house and has a first free connector ( 43, 63 ) at its free end to be attached to the fixed connector of a neighboring add/drop module for continuing the first path through the considered add/drop module to the neighboring module. In the same way a second fixed connector is attached to the house for connection in the second path and to a second optical fiber which extends freely from the house and has a second free connector at its free end to be attached to the fixed second connector of a neighboring add/drop module for continuing the second path through the considered add/drop module to the neighboring module.
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