Agilent Technologies 86120C, Руководство пользователя

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5-6
Performance Tests
Test 4. Optical Input Return Loss
Test 4. Optical Input Return Loss
Description Inp ut 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 module
Procedure Standard instruments (flat contacting connectors)
1 Turn the source module’s outp ut off.
2 Connect a single- mode patchcord between the source module’s optical
outp ut 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 p atchcord’s FC/PC connector in air).
9 Make a low- reflection termination in the HMS- 10/HRL to FC/PC
p atchcord. Do this by wrap p ing 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 p atchcord to the Agilent 86120C’s
front panel
OPTICAL INPUT connector.
12 The lightwave multimeter measures the return loss. Compare this
measurement with the sp ecification listed in
Chapter 6, “Specifications