Keysight N4372E, User Manual

Page: 141 / 152

Keysight N4372E Lightwave Component Analyzer User’s Guide 141
Definition of Terms 10
Measurement : Derived from Phase uncertainty.
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.
Minimum measurable frequency response (noise floor)
The average of the Responsivity measured by the LCA on a DUT with zero
output, expressed in Decibel (dBm, dBo, dBe). The 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.
Modulated optical power
The amplitude of a harmonic optical power modulation. The modulated
optical power is calculated from the peak optical power P
max
and the
average optical power P
avg
,
in Watts: P
mod
= P
max
– P
avg
in dBm: P
mod,dB
= 10-log(P
mod
/ 1mW).
CAUTION
Applying more than the specified maximum safe input power may
damage the LCA.
NOTE
Responsivity values are converted from Decibel (dBm, dBo, dBe) values
to linear values by: linear = 10
decibel/20
. The average is converted back to
decibels by: decibel = 20*log
10(linear)
.