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Optical Sampling Modules
3.
Record DC reference values (see note in step 11 under Setup):
a.
Push
Clear Data
.
b.
Acquire a histogram with
250,000
hits.
c.
Record the standard deviation from the histogram statistics:
σ
0.
d.
Record the wavelength of the sweep laser:
λ
0.
4.
Perform the frequency sweep to at least 1.5 x bandwidth. The recommended
frequency step size is
1 GHz
( 8 pm laser step size). For each frequency
point, perform the following steps (see note in step 11 under Setup):
a.
Step to and park sweep laser at next wavelength.
b.
Allow the laser to stabilize.
c.
Push
Clear Data
.
d.
Acquire a histogram with
250,000
hits.
e.
Record the standard deviation from the histogram statistics:
σ
i
f.
Record the wavelength of the sweep laser:
λ
i
5.
Record background standard deviation (due to laser and sampling module
noise).
a.
Set laser detuning to
≥
750 GHz
.
b.
Push
Clear Data
.
c.
Acquire a histogram with
250,000
hits.
d.
Record the standard deviation from the histogram statistics:
σ
b
6.
Calculate the normalized frequency response curve:
a.
The frequency values are given by:
where c = 2.9979 x 10
8
m/s (vacuum speed of light)
b.
The corresponding response values (dB) normalized to the lowest
frequency point (="DC") are given by:
7.
Check that the optical bandwidth is greater than or equal to that stated below
for each bandwidth setting.
a.
The optical bandwidth is determined by the frequency point where the
response curve crosses the –3 dB line. The limits follow:
234
DSA8300 Performance Veri
fi
cation
Содержание 80A00
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Страница 16: ...Important safety information x DSA8300 Performance Verification ...
Страница 213: ...Electrical Sampling Modules Figure 21 Setup to measure Power in DSA8300 Performance Verification 195 ...