User`s guide

Performance Tests Optional Performance Tests
144 Agilent 81600B Tunable Laser Source Family, Fourth Edition
Dynamic Wavelength Repeatability
This section describes the analysis steps leading to wavelength
repeatability with reference to a single sweep speed.
Repeat them until all sweep speeds of interest are covered.
The only measurement results to be considered here are the results of the
threshold-crossing analysis in the continuous sweep measurements:
λ
LOGGED
(i, n) i = 1, 2, ... 60 x 2, n = 1, ... 5 (scan repetition)
The results from all the tested wavelength intervals should here be merged
in a single array, since the final results must hold for the specification of
the whole TLS wavelength range.
Analysis
1 Estimate the local repeatability for each control wavelength as the
sample variances
σ
2
(i) among the repeated scans:
σ
2
(i) = 1/(5-1)*{Σ
j=1...5
[λ
LOGGED
(i,j)]
2
-5*{Σ
j=1...5
[λ
LOGGED
(i,j)/5]
2
} }
i = 1,2, ...60* 2
and its average over all control points
σ
2
σ
2
= 1/120 * Σ
i=1...120
[σ
2
(i)]
2 Calculate the Dynamic Wavelength Repeatability (see Definition of
Te r ms ) , gi v e n a s ±REP, using:
REP = +/- 2.663 * sqrt(
σ
2
)
or
peak-to-peak deviation: REP
peak-to-peak
= 2 * 2.663 * sqrt(σ
2
)