Grass Valley Viper II - Manual (Page 4)

102 Grove Street; Worcester, MA 01605 USA Phone: (508)754-4858 FAX: (508)752-1520
e-mail: [email protected] http://www.telecast-fiber.com
62.5 MULTI-MODE
50 MULTI-MODE
8 SINGLE-MODE HI ISOLATION
8 SINGLEMODE LO ISOLATION
FIBER
TYPE:
Telecast
Fiber Systems, Inc.
MWD5135
1300/1550 WDM
MADE IN USA
1550
1300/1550
1300
Operation
Relevant Part Numbers
General
1310nm
1550nm
IN/OUT
1
3
2
WDM
A WDM (Wavelength Division Multiplexer) is, in essence, a prism.
Whereas a prism divides light into all of its component colors, a
WDM is a passive device that is "tuned" to specific optical wave-
lengths. For the purposes of our systems, it gives us the ability to
put two different optical wavelengths onto a single optical fiber. As
the figure ot the right illustrates, by putting a 1310nm source into
the first leg (low side) of the WDM and a 1550nm source into the
third leg (high side) of the WDM a combined optical signal is
available on the second leg (IN/OUT). This combined signal can
then travel down the optical fiber into another WDM on the recieve
end of the system where the signals are seperated and sent to
their respective TX or RX modules. All telecast WDM's operate in
the same way, ie. leg 1 is for the lower wavelength, leg 2 is for
input/output and leg 3 is for the higher wavelength. WDM's are
also available for multimode 850/1300nm applications.
The Viper II system supports WDM's for both singlemode and
multimode operation.
The primary reason for using WDM devices is to reduce the
number of fibers required for your system. Since WDM's combine
two module sets onto one optical fiber, your fiber count is cut in
half.
MWD813-M Multimode 62.5/125µ WDM Coupler with ST's.
850/1300nm
MWD5135-M Multimode 50/125µ WDM coupler with ST's.
1300/1550nm
MWD5135-SD Singlemode 8/125µ WDM coupler with ST's.
1300/1550nm - Medium Isolation
MWD5135-SA Singlemode 8/125µ WDM coupler with ST's.
1300/1550nm - High Isolation
When possible, there are a few conventions that should be
observed when using WDM's in Telecast systems.
1. Try to WDM a TX with an RX
2. Try to WDM different types of signals (5122 with a 5259)
Sometimes this is just not possible so in cases where like signals
are used in the same direction, the user should be aware that
there is a slight chance of crosstalk between the two signals. This
condition is rare.
Telecast analog modules such as the 5122 require the use of
HIGH ISOLATION WDM's to further prevent crosstalk. When
using WDM's with these modules on singlemode fiber, the
MWD5135-SA is highly recommended.
All Telecast V2 WDM modules ship as single units. For most
applications, you will need to order two WDM's per link. Each
WDM ships with singlemode or multimode ST patch cords for
making the connections with the functional TX or RX modules.
The wavelength of each functionality module is indicated on the
side-panel decal. Choices are 850, 1300 and 1550nm. RX units
will be either 850 or 1300/1550. For convenience, place the WDM
module into the V2 frame between the two modules being
combined. This will facilitate easy identification and troubleshoot-
ing, if necessary.
Once the modules are in position in the V2 frame,
you can commence making the connections. Note
that the WDM is a passive device, and you can not
damage it by making an error in connecting it.
Caution: remember NOT to look directly into
connected patch cables as the may be connected to
an operating laser emitter. Eye damage could result!
Simply attach the LOW wavelength device to ST #1,
the HIGH wavelength device to ST #3 and the
outgoing fiber to ST #2. LED indications on the
respective modules will aid you in verifying these
connections once the frames are powered ON.
Hook Up Procedure
Troubleshooting
If you are certain that your connections are correct but the unit is
not working, optical power can be verified by using and optical
power meter (Telecast # PMTR-ST-3W) to verify the presence of
an optical signal at both the TX module and at the output (leg 2) of
the WDM. If the unit is not passing any optical power, contact
Telecast for an RMA number.
Wavelength Division
Multiplexers
WDM's