EdgeAccess® Universal Chassis System
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
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
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.
6002/6003/6004 WWDM Users Manual |