Diagnosing faulty fibre splices

//Diagnosing faulty fibre splices

Diagnosing faulty fibre splices

I go to lots of facilities where other engineers have run in fibre and the story is often the same – broadcast engineer who knows a bit about fibre and knows a firm who’ll pre-make him tight buffered cable.  Now – aside from the fact that tight-buffered cable for installation is never optimal why do they always choose the cheapest patch-cord cable rather than robust cable?

Anyhow – after a chat with an instructor at Tyco recently I realised you can light up a fibre with a visible laser and the light will spill out at a bad splice.  How often have I puzzled over which end of a loose-tube cable has the bad splice?  The tester tells you you’re losing 5dBs of optical power but without a Fluke DTX-1800 (or other fibre OTDR tester to hand) you can never tell which splice is to blame.

Faulty Fibre Optic SpliceThe picture shows a bad splice (but not that bad – it was only loosing 5.5dBs – so would be fine on 2gig and probably fine on 4gig, but not optimal). The little red dot in the middle of the splice protector was a lot clearer than this ‘phone-photo shows.

The Maplin keyfob laser pointer is the best fiver you can spend!

By |2016-10-29T08:56:07+00:00January 27th, 2011|Categories: Broadcast Engineering|Tags: , , , |0 Comments

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