Zsombor Papp wrote:
> For example, why exactly do we need that conditioning cable when
connecting
> a MM cable to a SM interface?
Because some MM cable has a small flaw exactly in the center of the
fiber (depending on the fabrication process, I believe). The MM
interface isn't bothered by it because it completely fills the entire
fiber, but the SM interface doesn't; it would run slam-bang into the flaw.
What the conditioning cable does is slightly offset the SM laser from
the center of the MM fiber, avoiding the flaw.
That's also why you don't always need it; if your MM fiber is made
differently, it may not have that flaw.
At least, that's how I always understood it.
Regards,
Marco.
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=72562&t=72544
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