Reference – 195
Problem Solution
12 The noise seen on a trace,
with only a fiber jumper, is
greater than ±0.02 dB.
Verify the noise level:
• Perform a zero loss reference.
• Repeat the measurement in insertion loss mode.
• Clean all connectors and repeat the measurement.
• Change jumpers and try again.
Verify power to the DUT:
Measure the power at the DUT with a power meter.
The correct power level is >-15 dBm without a
polarization controller and >-20 dBm with one.
If the power is within this specification, but the noise
persists, call the local JDS representative or the
service hotline.
Verify power to the control module:
If the power to the DUT is less than expected,
measure the power going into the control module.
Power is ~-11 dBm without a polarization controller
or -14 dBm with a polarization controller.
If power to the DUT is within specifications, power
is being lost in the control module.
If power is lost in the control module, clean the UCAs
on the control module:
• Remove the UCA connectors on the CM.
Clean the connectors and exposed ferrules
thoroughly,
• Re-install the UCAs.
• Perform a reference.
• Acquire a trace.
A persistent problem indicates that one of the UCAs is
damaged. Verify the power at the UCA on the control
module:
Measure the loss through each UCA. A small loss,
such as ~0.02 dB, is acceptable.
• If the loss is larger, replace the UCA and try again.
(table continued)
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