Re: [amsat-bb] Fiber Optics at RF

[Art Goldman <aegoldm@xxxxxxxxxxxx>]

Gary:

0 dBm suggests the units expect single mode fiber. That
power level is too high for MM fiber. Also, what are your
existing fibers for? If they are for fiber optic ethernet,
or ATM, they are most probably multimode fiber. The jacket
color will typically be orange or blue or green if they are
MM. If they are yellow, they are single-mode. 

Do the specs say what wavelength the units are sending?
Typically, SM is at 1310nm, although the 1500nm band is
heavily used in telecommunications for WDM channels. Both of
these require single mode fiber. 850nm would require
multimode fiber.

Another clue might be the connectors. Are they screw on
(FC), twist on (ST) or square (SC)? In particular, if the
socket color is green, that would suggest angled PC
connections, which are often used at 0 dBm. If the unit
requires APC connectors and you use PC, it won't work.

Lots of options here. Tell me what you observe and I can
help further.

Art N3OY


Gary Gonnella wrote:
> 
> The first question needs to be, Are they designed for Single Mode or Multi
> Mode fiber?
> One will not work with the other.
> 
> Gary Gonnella W6RYO
> gary@w6ryo.com
> http://www.w6ryo.com
> 
> > -----Original Message-----
> > From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
> > Behalf Of Bob Bruninga
> > Sent: Monday, October 21, 2002 5:49 AM
> > To: amsat-bb@AMSAT.Org
> > Subject: [amsat-bb] Fiber Optics at RF
> >
> >
> > Does anyone have any experience with Fiber Optics in linear applications
> > up to 2 GHz?
> >
> > We just got some F/O TX/RX's that are supposed to provide 0 dBm to 0 dBm
> > end to end over the frequency range of 10 to 2200 MHz.  But when
> > installed over our existing Fibers, they dont.  MFR's tech support's only
> > help was "are they plugged in"  Are they turned on?.  Should work.
> >
> > Bob
> >
> > ----
> > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
> 
> ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

-- 
Art Goldman
Staff Network Engineer
Northrop Grumman Information Technology
Laboratory for Telecommunications Sciences
(301)688-1719
----
Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org