User`s guide

Performance Tests Performance Test Instructions
58 Agilent 81689A, 81689B and 81649A Tunable Laser Modules User’s Guide, Third Edition
Power Stability
Follow the steps below to measure the power stability:
1 Set up the equipment as shown in Figure 12.
2 Move to the Tunable Laser channel of the Agilent 8164A/B
Lightwave Measurement System and press [Menu].
3 Set the menu parameters to the values shown in Table 5.
4 Set the wavelength and power for each Tunable Laser module to the
values given in Table 13.
5 Make sure the optical output is switched off.
6 Zero the power meter. From [Menu], select [Zero].
7 Press the key beside the laser output to switch on the laser.
8 Select the logging application. Press [Appl], select [Logging]
9 Within the logging application, set the power meter:
•Set λ, the wavelength, to the same as your Tunable Laser module, as
given in Table 13.
•Set Range to 0dB
• Set Ref mode to Value
• Set Samples to 4000
• Set the Average Time to 200 ms
• Set Range mode to common
• Set Power Unit to dB
• Set Ref to the value given in Table 13.
10 Start the Logging Application by pressing [Measure]
A measurement progress indicator is displayed.
11 When the measurement is completed, select [Analysis]
12 From the Statistics window, note:
• the “max” value in the Maximum Deviation field of the test record,
• the “min” value in the Minimum Deviation field of the test record,
Table 13 Wavelength and Power Settings for Power Stability Tests
Module Wavelength [λ] Power [P]
Agilent 81689A 1540.000 nm − 3.00 dBm
Agilent 81689B 1540.000 nm − 0.00 dBm
Agilent 81649A 1570.000 nm − 3.00 dBm