Atec Agilent-8703A - Manual (Page 10)

Single point uncertainty
Individual uncertainty elements are shown below for a
10 GHz modulation frequency data point of a photodiode
receiver transfer function measurement done on an 8703A.
The uncertainty graphs on pages 8 and 9 summarize the
results of this same analysis for optical and electro-optical
device measurements across wide modulation bandwidths.
Device description
Device: photodiode receiver
Data point slope responsivity: –10 dBe
RF output port return loss: 50 dB
Optical input port return loss: 50 dB
Description of uncertainty term
Lightwave source port return loss . . . . . . . . . . . . . . . .15 dB
Transmission tracking . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.25 dB
Microwave receiver port return loss . . . . . . . . . . . . .30 dB
System dynamic accuracy . . . . . . . . . . . . . . . . . . . . . . . . .0.3 dB
Connector repeatability. . . . . . . . . . . . . . . . . . . . . . . . .0.005 dB
Lightwave source stability . . . . . . . . . . . . . . . . . . . . . . . .0.1 dB
Lightwave receiver factory calibration
uncertainty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.65 dB
Switch repeatability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.03 dB
Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.01 dB
Total measurement uncertainty value . . . . . .±0.76 dB (RSS)
Measurement repeatability
Typical measurement repeatability represents how
measurement uncertainties can affect measurements made
on different 8703A instruments. Each graph below shows
data of the same device tested on 10 different 8703A
instruments. All measurements were done using a 30 Hz
IF bandwidth, a 10 averaging factor and a 23 ±3°C
temperature range.
Optical-to-optical
measurement
repeatability (typical)
(DUT = 2 meter single
mode fiber) Optical-to-electrical
measurement
repeatability (typical)
(DUT = photodiode
receiver) Electrical-to-optical
measurement
repeatability (typical)
(DUT = FP laser
source)
10
Lightwave measurement
accuracy examples