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6-7
Performance Tests
Test 4. Optical Input Return Loss
Procedure:
Option 022 instruments (angled contacting connectors)
1
Turn the source module’s output off.
2
Connect a single-mode patchcord between the source module’s optical output
and the return-loss module’s
INPUT SOURCE
connector
.
3
Set the return-loss module’s wavelength to 1550 nm, and select an average time
of 1 second.
4
Locate an HMS-10/HRL to FC/APC (angled FC) patchcord. Connect the HMS-
10/HRL end of the patchcord to the return-loss module’s
OUTPUT
connector.
Terminate the FC/APC end of the cable.
5
Zero the return-loss module.
6
Turn on the source module.
7
Remove the termination from the cable, and connect the FC/APC end of an FC/
APC to FC/PC cable to the free end of this cable. Leave the cable’s free end
uncovered.
8
The return-loss module measures the reflection reference (14.6 dB return loss
of the patchcord’s FC/PC connector in air).
9
Disconnect the FC/APC to FC/PC cable.
10
Make a low-reflection termination in the HMS-10/HRL to FC/APC patchcord.
Do this by wrapping the cable 6 times around a 5 mm diameter mandrel.
11
The return-loss module measures the termination parameter.
12
Connect the HMS-10/HRL to FC/APC patchcord to the Agilent 86120B’s front
panel
OPTICAL INPUT
connector.
13
The lightwave multimeter measures the return loss. Compare this
measurement with the specification listed in Chapter 7, “Specifications and
Regulatory Information”.