26 Jan
2012
26 Jan
'12
5:48 p.m.
On Thu, Jan 26, 2012 at 13:47, David Storandt <dstorandt@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.