Keysight N4372E Lightwave Component Analyzer User’s Guide
139
Definition of Terms
10
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 (optical) applies.
Decibel (dBm, dBo, dBe)
A ratio in decibel (dB) is calculated as 10-log10{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).
dB
W/A
: The square of the Responsivity R divided by 1 A/W,
or
dB
W/A
is defined correspondingly to dB
W/A
.
NOTE
Differences of powers in dBm are written as “dBo” for optical powers or
“dBe” for electrical powers.
NOTE
Differences of responsivities in dB
A/W
or dB
W/A
are written as “dBe”.
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