Keysight Technologies N4374B, User Manual

Page: 130 / 164

Definition of Terms
128
Keysight
N4374B Lightwave Component Analyzer, User’s Guide
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).
Operating frequency range (optical test set)
The modulation frequency range for which the LCA optical test
set (including optical transmitter and receiver) is designed to
supply give measurement results.
OMI (optical modulation index)
Specifies the Modulated optical power divided by Average
output power (optical) .
Condition: modulation frequency as specified.
N O TE
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).
P
opt
( t )
t
P
mod
P
avg
harmomic
oscillation
P
max
N O TE
Modulated optical power divided by average optical power is a value
between 0 (no modulation) and 1 (full modulation). See also
OMI (optical
modulation index) .
N O TE
For full modulation, modulated optical power equals average optical
power.