Definition of Terms
Keysight
N4375D Lightwave Component Analyzer, User’s Guide
133
Frequency response repeatability
In repeated measurements of the (absolute) frequency
response under constant conditions, the repeatability
±
Rep
at each modulation frequency is defined as twice the
standard deviation, StDev
i
, of the measured responsivities
R
i
over the repetitions
i
:
Rep
2 StDev
i
R
i
=
Conditions:
fixed cables and unchanged connections. Other
conditions as specified.
Measurement:
using a stable DUT.
Group delay (GD)
The signal delay time caused by a transmission path
(component). The group delay is derived from the phase
change d
j
of a harmonic signal detected after the path
(component) resulting from a small frequency change d
f
mod
of the signal,
GD
d
df
mod
----------------
360
=
with phase change d
j
expressed in degrees.
Group delay uncertainty
Specifies the maximum difference between measured
and actual
.
For E/O and O/E, group delay uncertainty excludes a constant group delay
offset (see
). Other conditions as specified.
Measurement:
Maximum linear average input power (optical)
The maximum average optical input power at the LCA
optical input for which the system specifications apply.
Conditions:
as specified.
N O T E
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