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Priority to NO20070771ApriorityCriticalpatent/NO20070771L/en
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Det er tilveiebrakt en signalsplitter (24) som omfatter en inngang (26) og en flerhet av utganger (28, 30), hvor alternerende utganger (28) er koplet til faseendringsanordninger (32). Faseendringsanordningene (32) omfatter faseendrings-transformatorer og innfører en faseforskyvning på 180°, slik at støykomponenter i alternerende utganger (28) er i motfase og opphever hverandre nesten fullstendig når signalene summeres. Det er også tilveiebrakt et kabelfjernsynsnett omfattende en flerhet av slike signalsplittere for å sikre at støyinntrengning i oppstrømssignaler som passerer inn i nettet blir vesentlig redusert.A signal splitter (24) is provided which comprises an input (26) and a plurality of outputs (28, 30), alternating outputs (28) being connected to phase change devices (32). The phase change devices (32) comprise phase change transformers and introduce a phase shift of 180 °, so that noise components in alternating outputs (28) are in opposite phase and cancel each other out almost completely when the signals are summed. A cable television network is also provided comprising a plurality of such signal splitters to ensure that noise penetration into upstream signals passing into the network is significantly reduced.
Interferometric element, interferometric n-stage tree element, and method of processing a first optical input signal and a second optical input signal so as to provide a plurality of orthogonal output signals
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