LX sfp minimum range

Thu Jan 26 22:48:05 UTC 2012

On Thu, Jan 26, 2012 at 13:47, David Storandt <dstorandt at teljet.com> wrote:
> You can put a 3dB or 5dB optical pad on the link if the receiver can't
> handle zero-distance optical power.

As I recall, the problem may not only be the power
(which can cause receiver saturation), but issue that
fibre paths shorter than (around) 2-10m do not properly
condition the light(*), which can result in some issues
at the receiver.

Gary

(*) My memory says modal distribution issues.
    While 'single mode' fibre only supports one
    mode of transmission, it takes a short distance
    for the fibre to really be single mode.  You can
    use a mode filter to address the problem, or just
    use fibres that are at least a few meters.