[AusNOG] Water in Fibre cables

[Ben Buxton]

On Fri, Mar 9, 2012 at 9:49 AM, Rod Veith <rod at rb.net.au> wrote:

> ·        **whether moisture directly against a fibre changes the
> refractive index of the fibre to an extent that communications is affected.
>
>
>
On this point - unlikely. As long as the cladding is undamaged, the
refractive properties are unchanged.

The cladding is not the sheath or anything you can see, but basically on
the individual fibres (each fibre is the core+cladding). The chances of
breaking the cladding without breaking the fibre is somewhat remote.

You pretty much have to physically nick the fibre, or get water into an air
gapped joint (eg SC-SC joiner) for performance to be affected. Water
leaking into the sheath should not affect comms if the fibres are
themselves undamaged.

BB
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