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N O T E
C A U T I O N
Keysight N4373D Lightwave Component Analyzer, User's Guide
Group delay (GD)
The signal delay time caused by a transmission path
(component). The group delay is derived from the phase change
dj of a harmonic signal detected after the path (component)
resulting from a small frequency change df
with phase change dj expressed in degrees.
Group delay uncertainty
Specifies the maximum difference between measured and
actual
Group delay
(GD).
For E/O and O/E, group delay uncertainty excludes a constant group delay
offset (see
Phase
uncertainty). Other conditions as specified.
Measurement: Derived from
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.
Maximum safe average input power (optical)
Maximum optical power that can be applied to the LCA optical
input without permanent change of the LCA's characteristics.
Applying more than the specified maximum safe input power may
damage the LCA!
Minimum measurable frequency response (noise floor)
The average of the
Responsivity
with zero output, expressed in
value is calculated by averaging the measured responsivity in
linear space (rather than decibel space) over the modulation
frequency within a specified modulation frequency range.
Conditions: As specified.
mod
d
GD
=
--------------- - 360
df
mod
Phase
uncertainty.
measured by the LCA on a DUT
Decibel (dBm, dBo,
Definition of Terms
of the signal,
dBe). The
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