Feedthrough
A pair of fibre feedthroughs joins a fibre network across two tabs. A fibre into one comes out at its partner on the other tab, and back, so a large network can be laid out over several benches and still be solved as one.
Ports
One port, port.
The model
Two feedthroughs that share a pair name, on different tabs, are one joint. Light arriving at either leaves its partner as it arrived, with no loss, no phase and no delay: the fibres either side add their own, as if they were one fibre spliced together. The network is solved across all the tabs at once (see Fibre optics: solving the network).
On the bench, each feedthrough’s panel says where it leads, with a button to go to its partner. A feedthrough without a partner offers to make one, on any other tab or a new one.
Settings
It has one setting, its pair name, shared by exactly two feedthroughs.
Assumptions
- The joint is ideal: no loss, reflection or delay.
- Exactly two feedthroughs share a name. A feedthrough with no partner joins nothing, and light reaching it is lost.
Related
- Link plane, which does the same for free space.
- Electrical feedthrough, which does the same for signals.
- Concepts: tabs and link planes.