EXFO IQS-12004B DWDM Passive Component Test System for IQS-500 - Manual (Page 92)

Calibrating the DWDM Passive Component Test System
80 IQS-12004B
Calibrating the System
Return Loss Calibration
The return loss calibration is performed in two steps (ORL Calibration and
ORL Calibration Zero) using a reflection reference jumper supplied with
the IQS-12004B DWDM Passive Component Test System. This reflection
reference is connected to the output of the WRM and provides a known
optical reflection.
During the first step, the system will scan the full tuning range. The second
step of the ORL calibration is a zero reflection scan (again across the
complete tuning range) of the reference jumper. Based on the two scans,
the ORL calibration factors are calculated and stored into a system
calibration file.
It will be necessary to repeat the return loss calibration if any of the
modules (Source, WRM, or PSA) are replaced. One way of verifying the
ORL measurements is to measure the ORL of the reflection reference. The
result should be 14.7 dB ± the uncertainty specified in the specification
table.
To perform the return loss calibration:
1. Connect the reflection reference jumper, as shown in the figure below.
2. Click OK.