CANOGA PERKINS Multiplexer 6002 - Manual (Page 11)

EdgeAccess ® Universal Chassis System
6002/6003/6004 WWDM Users Manual 2-3
2.4.4 Checking Optical Power Levels
Each 6002/3/4 model is shipped with a document that lists the specific output power for each
local and remote laser. To ensure proper optical performance levels, the link loss or attenuation of
all fiber cables should be measured and identified. Determine the link attenuation by using a
1310/1550nm laser source. Either a hand-held or other similar measuring device can be used.
To measure power levels of local and remote transmitters, these parts will be needed:
• Signal source capable of the proper wavelength.
• Test jumper cable.
• Optical power meter.
Note: For accurate results, be sure that each component’s attenuation is known. The modules
should be warmed up for at least 30 minutes prior to checking input and output power levels.
2.4.5 Measuring Remote Transmitter Output Power
When connecting to a Wavelength Division Multiplexer (WDM) module, measure the power
output level at the remote transmitter (Tx) port.
Note: Remote transmitters may operate in the 1550nm window; therefore, it is important that the
optical power meter be calibrated for the proper wavelength.
To measure power output level of the remote transmitter:
Step 1 Activate the laser for the specific channel to be tested.
Note: Measurement of the remote transmitter output power should be done by
sequentially activating one channel at a time, and taking a measurement after each
channel is activated. This will ensure that the output power level has not become
corrupted with power from adjacent wavelength channels.
Step 2 Connect the power meter to the remote transmit (Tx) connector on the 6002/3/4 module
using an appropriate fiber optic jumper cable.
Step 3 Record the level and compare to the value on the furnished performance sheet for that
particular channel. Note that the remote output power decreases by about one dBm per
channel with each increasing channel number.
Note: A less negative numerical value indicates a greater optical power level.
For example, a power reading of -17.0dBm is greater than -20.5dBm.
Step 4 Repeat steps 1 through 3 for the other remote channels.
Note: If you cannot get a correct reading, take a second measurement using a different
cable. Call Technical Support if the power level is not within the required range.
If the link attenuation is known or has been measured, then subtracting this value from
the values measured above will give the power expected at the remote cable end or the
expected receiver input power level.