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7
Return Loss Measurement
210
Keysight 81610A
P
src
Figure 131
Generalization of a Return Loss Measurement
The transmitted power, (E), is directly proportional P
That is:
The constant a is a multiplier giving the proportion of power that the light
source emits that is measured by the power meter.
The constants a
and a
Ref
the Power Transmitted Through the Reflection Reference
in
Measuring the Power Transmitted Through the Measurement Patchcord
on page 205 respectively.
This gives the following two equations:
If we divide equation 11 by equation 12, this gives the following equation:
The loss variation, ΔL, due to exchanging the reference cable for the
measurement cable is given by:
E
=
aP
src
apply to the setups described in
Meas
E
=
a
P
Ref
Ref
src
E
=
a
P
Meas
Meas
E
a
Ref
Ref
-------------- -
=
------------- -
E
a
Meas
Meas
8163A/B, 8164A/B, 8166A/B User's Guide
Reflection Reference
Power Meter
E
.
src
(12)
Measuring
on page 204 and
(13)
(14)
src
(15)
(16)
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