This week we were able to get early access to the pilot-sites and a backbone fibre-span we will use to do acceptance-testing with. The span is between Stockholm (Tulegatan) and our new site in Västerås. In the middle of absolutely nowhere a couple of kilometers north of Enköping there is also a amplifier-site.
In Tulegatan there is a Juniper MX480 originating a 100G Coherent wave that goes straight into the ROADM (no transponders here as i mentioned earlier), then goes onto the line-fiber. It gets amplified in Enköping and then lands into another ROADM in Västerås straight through to another Juniper MX480 with a Coherent reciever.
After some struggle with a malfunctioning ROADM-card that didn’t pass any light in one direction this span is lit up and traffic is passing through without any problems.
When you work with fiber and especially in DWDM-related scenarios cleaning fibers is always of uttermost importance. Dirty connectors cause attenuation which can destroy the optical budget calculated on a link. Blowing in the ODF connectors and wiping the patch-connectors on your jeans is without any doubt the most effective way to make your fibres dirty. To illustrate this i uploaded our initial FiberScope-tests on both connectors in the ODF´s and on patches, some of them brand new. Nothing is clean until you have actually scoped it and verified, especially if its fresh from the factory.
Connecting fibres with connectors like this on a optical system does not only cause you attenuation but it could also damage both the ODF and the patch since the dirt can over time etch in the glass if unlucky.