Atec Agilent-8703A - Manual (Page 8)

Lightwave measurement uncertainty is presented in the
following graphs and tables. This covers three types of
measurements: optical (transmission and reflection)
measurements, optical-to-electrical measurements, and
electrical-to-optical measurements. Data is recorded after
an 8703A accuracy enhancement has been performed
using the indicated calibration type. This analysis accounts
for the following errors
23 :
• Residual systematic errors (Table 5)
• System dynamic accuracy (dB from reference)
24
• 3.5 mm connector repeatability 25
• Lightwave source stability
• Lightwave source and receiver factory calibration
uncertainty 26
• Switch repeatability
• Noise
A 10 Hz IF bandwidth, a 16 averaging factor and a
23 ±3°C temperature range are used in all cases. Data
applies to all 8703A internal source configurations of
Table 4.
The following table shows 8703A residual systematic
errors after accuracy enhancement using the same
calibration and setup as stated for each of the three
lightwave measurement types.
Table 5. Residual
lightwave measurement
systematic errors.
Frequency range (GHz)
0.13 to 12.0 12.0 to 20
Optical residual characteristics
(typical)
Lightwave source port return loss
15 dBo 15 dBo
Lightwave receiver port return loss 20 dBo 20 dBo
Transmission tracking 27 ±0.55 dB ±0.55 dB
Lightwave directional coupler
test port return loss
37 dBo 37 dBo
Directivity 37 dB 37 dB
Reflection tracking 27 ±0.45 dB ±0.45 dB
Electrical residual characteristics
(typical)
Microwave source port return loss
29 dBe 28 29 dBe
Microwave receiver port return loss 30 dBe 30 dBe
8
Lightwave measurement
accuracy summary
Optical transmission and reflection
Measurement setup
Calibration type: response & isolation
Calibration standards:
14.5 dB return loss Fresnel standard
Connectors and cables:
HMS-10 lightwave connectors
40 cm single mode fiber cables
Measurement uncertainty 29
Transmission test
Magnitude
Phase
(typical)
Reflection test
Magnitude
(typical)