CWDM question
Justin M. Streiner
streiner at cluebyfour.org
Fri Dec 13 15:12:34 UTC 2013
On Thu, 12 Dec 2013, Keith wrote:
> Fixed optics, there are no transponders, just a passive mux. No filters,
> though there is a pad on our side.
> Light levels on our side are good and within spec. I have been trying to find
> out from the SP what theirs
> are at presently, but when the circuit was first lit levels were taken and
> found to be within spec on both
> ends.
Another possibility is that the fiber you're using has higher attenuation
at 1471nm than at 1310. While 1471 is outside of the 'water peak' band
(E band - 1360-1460nm, centered at 1383nm, iirc), the type of fiber could
could still have higher attenuation that runs into the S and O bands.
If replacing optics doesn't solve the issue, you'll probably need a test
set that can test specifically at 1471 nm.
jms
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