Have a question or want to start a discussion? Post it! No Registration Necessary. Now with pictures!
- Posted on
- SMF-28 attenuation vs wavelength
November 14, 2013, 2:37 pm
rate this thread
Re: SMF-28 attenuation vs wavelength
And your problem with that is what, precisely?
SMF-28 is a bit old-school. Not sure where to dig up a product data
sheet for it at this date. Ah, here's a blast from 2002 just for that.
for the worst case, take the non-premium fiber number at 1550 and apply
the attenuation .vs. wavelength adjustment to get 0.27 dB/km (and look
at the typical fiber graph to extrapolate downward towards 1600)
SMF-28e+ has a currently available datasheet, which pretty much says you
probably have an acceptable number already. The water-peak reduction is
at shorter wavelengths than you are asking about, so it probably has
little effect .vs. old SMF-28, if that is what you have.
1550 - 0.19-0.20 dB/km 1525-1575 delta 0.03 dB/km
1625 - 0.20-0.23 dB/km
Those are maximums, for design purposes - a link designed with those
numbers and correctly installed should function. Actual attenuation
could be less without violating specs.
If you have a need for "actual" rather than "maximum" attenuation,
you'll have to measure it, and reduce all points of measurement error as
much as possible if you feel a need for greater precision. That will
tell you what the piece of cable you are measuring will do - it may not
generalize to other cables well.
If you have a need for greater reliability, assume 0.25 dB/km and build
in some margin.
If you have some other need, please explain it more completely, and you
might get a better answer.
This link discusses attenuation .vs. wavelength somewhat generally, with
graphs you might find helpful. Paste it together if it gets mangled in
Cats, coffee, chocolate...vices to live by
Please don't feed the trolls. Killfile and ignore them so they will go away.
- » NYC local event: UNIGROUP 15-JUN-2017 (Thu) Meeting: Optical Fiber...
- — Newest thread in » Fiber Optics