196 – Reference
Problem
Solution
12
The noise seen on a trace,
with only a fiber jumper, is
greater than ±0.02 dB.
Verify the power to the control module (CM) from the
transmitter:
•
Verify that the UCAs are good.
•
Disconnect the polarization controller, if one is
installed.
•
Attach a jumper between the Signal Cond. Out port
and the Signal Cond. In port.
•
Verify that the laser is scanning.
•
Measure the power coming into the CM from the
transmitter. The magnitude varies during this
measurement. The true measurement is the value
that stays steady for approximately one second as
the laser is sweeping back to the start wavelength.
•
The maximum value of the power must be greater
than:
-5 dBm for a one-output transmitter
-8 dBm for a two-output transmitter
-11 dBm for a four-output transmitter
•
Measure the power at the output of the control
module.
•
Compute the loss through the CM.
If the loss through the CM is greater than 3 dB, call the
local JDS Uniphase representative or the service
hotline to return the CM for repair.
If the power coming into the control module is low,
check the fiber jumpers:
•
Check the fiber from the transmitter to the CM. The
fiber must not be stressed in any way, or have
kinks or sharp bends in it.
•
Clean the connectors at both ends of the fiber.
•
Clean the ferrule on the UCA on the source optics
module.
•
Verify that the FC/PC connector is at the SOM end
and that the FC/APC connector is at the control
module end.
•
Perform a reference.
•
Acquire a trace.
(table continued)
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