Definition of Terms
Keysight
N4375D Lightwave Component Analyzer, User’s Guide
131
Average output power uncertainty (optical)
The maximum difference between actual (true)
and the nominal (selected)
average output power.
Conditions:
After modulator auto bias (“modulator
optimization”) performed with the selected wavelength. Other
conditions as specified.
Measurement:
Using an average power meter with averaging
time set to 1 s.
Average power measurement uncertainty (optical)
Maximum difference between measured average (over time)
optical power and true average optical power at the LCA
optical input.
Measurement:
Comparison with an average power meter
with averaging time set to 1 s.
Average power measurement range (optical)
The range for the average optical power where the
specification for
Average power measurement uncertainty
applies.
Decibel (dBm, dBo, dBe)
A ratio in decibel (dB) is calculated as 10- log
10
{ratio}.
Special cases:
• dBo: specifically the ratio of optical powers (‘o’ for
‘optical’).
• dBe: specifically the ratio of electrical powers (‘e’ for
‘electrical’).
• dBm: power level related to 1 mW (electrical or optical).
Differences of powers in dBm are written as “dBo” for optical powers or
“dBe” for electrical powers.
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