Table of Contents
Advertisement
Procedure:
1 Turn the source module's output off.
2 Connect a single-mode patchcord between the source module's optical output and the
3 Set the return-loss module's wavelength to 1550 nm, and select an average time of 1
4 Locate an HMS-10/HRL to FC/APC (angled FC) patchcord. Connect the HMS-10/
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
8 The return-loss module measures the reflection reference (14.6 dB return loss of the
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
11 The return-loss module measures the termination parameter.
12 Connect the HMS-10/HRL to FC/APC patchcord to the Keysight 86120B's front
13 The lightwave multimeter measures the return loss. Compare this measurement with
Option 022 instruments (angled contacting connectors)
return-loss module's INPUT SOURCE connector.
second.
HRL end of the patchcord to the return-loss module's OUTPUT connector.
Terminate the FC/APC end of the cable.
to FC/PC cable to the free end of this cable. Leave the cable's free end uncovered.
patchcord's FC/PC connector in air).
this by wrapping the cable 6 times around a 5 mm diameter mandrel.
panel OPTICAL INPUT connector.
the specification listed in
FC/APC patchcord loss
The effect of having loss in the FC/APC patchcord 1 to 2 connector pair is to
under measure the return loss by twice the FC/APC patchcord 1 to 2 loss. For
example, if this connector pair loss is 0.5 dB, then the actual return loss caused
by the 14.6 dB Fresnel reflection is 15.6 dB, but we enter 14.6 dB as an R value.
Then, if the DUT return loss is exactly 40 dB below that of the 14.6 Fresnel
reflection, the optical return loss module will display 53.6 dB because the 0.5
dB connector pair loss (seen twice) is removed. In reality, the return loss is 54.6
dB (exactly 40 dB below 14.6 dB), better than that displayed.
Chapter 7, "Specifications and Regulatory
Performance Tests
Test 4. Optical Input Return Loss
Information".
225
Advertisement
Table of Contents
