User`s guide

Performance Tests Performance Test Instructions
54 Agilent 81689A, 81689B and 81649A Tunable Laser Modules User’s Guide, Third Edition
Power Linearity
Power Linearity - High Power Test
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 10
5 Make sure the optical output is switched off.
6 Set the 81626B to the following settings:
a Zero the 81626B; from [Menu] press [Zero].
b Select Automatic ranging. This is the default setting.
c Set the Averaging Time to 500 ms.
d Select dB as the power units.
e Set λ, the wavelengt h, to t h e s a me as you r Tu n able Laser module,
as given in Table 10.
7 Press the key beside the laser output to switch on the laser.
8 Press Disp−>Ref on the 81626B.
9 Change the power setting of your Tunable Laser module to the next
value listed in the test record and record the power displayed by the
81626B again.
10 Record the (rel;ative) power displayed by the 81626B as the
"Measured Relative Power from start".
11 Calculate the "Power Linearity at current setting” as the sum of
"Measured Relative Power from start" and "Power Reduction from
start".
12 Repeat item 9 to item 11 for all power levels listed in the test record.
Table 10 Wavelength and Power Settings for High Power Linearity Tests without
Attenuation
Module Wavelength [λ] Power [P]
Agilent 81689A 1540.000 nm +6.000 dBm
Agilent 81689B 1540.000 nm +10.000 dBm
Agilent 81649A 1600.000 nm +6.000 dBm