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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 µm source
module
• Agilent 81534A return loss module
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 86120C’s
front panel OPTICAL INPUT connector.
12 The lightwave multimeter measures the return loss. Compare this
measurement with the specification listed in Chapter 6, “Specifications