198 – Reference
Problem Solution
12 The noise seen on a trace,
with only a fiber jumper, is
greater than ±0.02 dB.
If the power going into the SOM is too low, below 3
dBm, the laser is the source of the problem. If the laser
is the problem:
• Stop the scanning of the laser through the SOM.
Press the REMOTE button on the laser, if the
REMOTE LED is on.
• Calibrate the laser power.
• Measure the output of the laser.
If the laser power remains low, call the local JDS
Uniphase representative or the service hotline.
13 In PDL mode, the PDL of
the device is very noisy.
Verify PDL noise:
The PDL computation is sensitive to the power at
which the measurement is made. Ignore PDL
measurements for insertion losses greater than 40
dB.
If the PDL is noisy only at high insertion losses,
there is no problem.
If the PDL is noisy at low insertion loss, try
averaging over a few scans, or filtering, or both.
If the problem persists, call the local JDS Uniphase
representative or the service hotline.
14 While making PDL
measurements, the PDL
shows only noise at all
wavelengths.
Verify that PDL measurements are being made:
Check the LEDs on the front panel of the
polarization controller. The displayed PDL must
cycle from 1 through 4.
If the cycle stays at one polarization, or if the
display shows 0 at any time, check the RS232
connection to the polarization controller.
• The correct cable has part number ED009172-A-
00. One end plugs into the AUX2 port on the SOM,
the other end connects to the RS232 Control on the
back panel of the polarization controller. Verify the
connections.
Verify the optical connections. The black PM fiber
goes from the Signal Cond. Out port of the SOM to
the IN port on the polarization controller.
The FC/PC-FC/PC jumper goes from the OUT port
on the polarization controller to the Signal Cond. In
port on the SOM.
(table continued)
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