User`s guide

Optional Performance Tests Performance Tests
Agilent 81600B Tunable Laser Source Family, Fourth Edition 141
19 Disable automatic re-interpolation of power-wavelength pairs (that is,
set hp816x_returnEquidistantData() to false);
20 Set the sweep parameters according to settings specified at step 6
(hp816x_prepareMfLambdaScan with
numberofScans = hp816x_NO_OF_SCANS_1;
This call also automatically programs the averaging times of the power-
meter as required);
21 Execute the wavelength sweep (hp816x_prepareMfLambdaScan)
and read out the wavelength data (logged wavelength);
22 Read out the logged power data (hp816x_getLambdaScanResult);
23 To compensate for the group-delay of the receivers in the power-meters
models, delay the logged wavelength values by the following fractions
of the sampling steps using linear interpolation (lever rule) between
wavelength samples:
24 Retrieve the following results from the reference scan performed in the
same wavelength range:
positions
λ
peak
(j) of the reference transmission peaks, and threshold
crossings λ
ref
(i) ;
25 Use the corrected wavelength values and the power values of the
current scan to find the positions of the -2 dB threshold crossings for
the same transmission peaks λ
peak
(j)
(linear interpolation between the two closest wavelength-power
points):
λ
LOGGED
(i, n) i = 1, 2...60, n = 1 ... 5 (scan repetition)
Note that the threshold position is relative to the maximum power of
the transmission peak, as in the reference sum, hence it is slightly
wavelength dependent.
26 Compute the deviations of these positions (computed with the logged
wavelengths) from the reference ones:
∆λ
LOGGED
(i, n)= λ
LOGGED
(i, n) - λ
REF
(i, n)
27 Repeat these steps for each required value of sweep speed. Store the
results separately for later analysis.
Sweep Speed 5 nm/s 10 nm/s 20 nm/s 40 nm/s 80 nm/s
Delay 4% 10% 20% 40% 80%