| 摘要 |
The invention relates to methods of upgrading optical transmission networks, upgradeable optical transmission networks, and upgradeable optical transmission nodes. The node of the invention is an upgradeable optical transmission node comprising a plurality of optical fiber transmission lines, a plurality of optical splitters ( 2 ) each having one input optical fiber transmission line ( 20 ) and a plurality of output optical fiber transmission lines ( 21 to 24 ), a plurality of optical combiners ( 3 ) each having a plurality of input optical fiber transmission lines ( 31 to 34 ) and one output optical fiber transmission line ( 30 ), at least one of the output optical fiber transmission lines ( 23, 24 ) of at least one of the optical splitters having a free end and at least one of the input optical fiber transmission lines ( 33, 34 ) of at least one of the optical combiners having a free end.
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