Using One Device For Optical Power Measurement (With Loopback Function) - VeEX FX87 User Manual

8.5 Using One Device for Optical Power
Measurement (with Loopback Function)
Optical power in a cable can be measured with just one FX87 device. In this case the device
employs both the light source and the power meter and is plugged in at one location, while on
the other location the loop is closed with a patch cord (see the Figure below).
Using one device for optical power measurement (Loopback function)
The loop must be closed on Location B with a patch cord. If the Location B
technician fails to do that, FX87 shows "0" power value in µW and the dBm value
below the sensitivity limit.
If FX87 is used both as a power meter and a light source, set the Light Source
first.
For such measurements the Loopback function may be useful. It immediately sets the
wavelength for the power meter, making it the same as the Light Source wavelength.
To use the Loopback function:
1. Set the Light Source as described in Section
2. Enter one of the PM modes as described in Section
press the |F1|
FX87 DWDM Tunable Laser Source User's Manual
button (WAVE) and select LOOPBACK (see below):
7.0. FX87 as a Tunable Light
8.3. Power Measurements. Then
.
Source
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