Filter
Top Products
6-6
Performance Tests
Test 4. Optical Input Return Loss
Test 4. Optical Input Return Loss
Description
Input return loss is verified using the following devices:
• Agilent 8153A Lightwave Multimeter
• Agilent 81553SM 1550 nm Fabry-Perot laser, SM 9/125
µ
m Source Module
• Agilent 81534A Return Loss Model
Procedure:
Standard instruments (flat 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/PC patchcord. Connect the HMS-10/HRL end of
the patchcord to the return-loss module’s
OUTPUT
connector. Terminate the
other end of the cable.
5
Zero the return-loss module.
6
Turn on the source module.
7
Remove the termination from the cable, and 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
Make a low-reflection termination in the HMS-10/HRL to FC/PC patchcord. Do
this by wrapping the cable 6 times around a 5 mm diameter mandrel.
10
The return-loss module measures the termination parameter.
11
Connect the HMS-10/HRL to FC/PC patchcord to the Agilent 86120B’s front
panel
OPTICAL INPUT
connector.
12
The lightwave multimeter measures the return loss. Compare this
measurement with the specification listed in Chapter 7, “Specifications and
Regulatory Information”.