User`s guide

Performance Tests Performance Test Instructions
56 Agilent 81689A, 81689B and 81649A Tunable Laser Modules User’s Guide, Third Edition
Power Flatness over Wavelength
Power Flatness over Wavelength
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 11.
5 Set the power meter channel of the 81626B to the following settings:
a While the laser is switched off, Zero the power meter; from
[Menu], select [Zero].
b Select Automatic ranging. This is the default setting.
c Set the Averaging Time to 500 ms.
d Set λ, the wavelengt h, to the same as you r Tunable Laser mod ule ,
as given in Table 11.
e Select dB as the power units.
6 Press the key beside the laser output to switch on the laser.
7 Select the channel for the 81626B. Press the DISP->REF hardkey.
8 Increase the wavelength of the Tunable Laser module and of the
Power Meter to the next value listed in the test record.
9 Measure the change in output power. Note this value (in dB) in the
test record.
10 Repeat steps 7 and 8 for the wavelength settings given in the test
record.
11 From the measurement results calculate the difference between the
maximum and minimum deviation from REF and note the result as
the Flatness.
Table 11 Wavelength and Power Settings for Power Flatness over Wavelength at
maximum output power
Module Wavelength [λ] Power [P]
Agilent 81689A 1525.000 nm +6.000 dBm
Agilent 81689B 1525.000 nm +10.000 dBm
Agilent 81649A 1570.000 nm +6.000 dBm