EXFO FPM-300 Power Meter - Manual (Page 22)

Using a Light Source (FLS-300 and FOT-300) 17
Sending Source Power Value with Signal
Your source can transmit a user-defined power value to compatible power meters
(such as FOT-300 and FPM-300) through the fiber. If the reference source is far from
the power meter, you can connect your source to the power meter to send the
reference value. With this feature you can also correct for power variations.
Note: If you connect a fiber between FOT-300’s source and detector ports, the
unit can use the actual source output power as reference power.
Note: For details about how compatible power meters receive this power
value, see Referencing Your Power Meter to a Source on page 11.

If the source emits an auto-wavelength signal (see Automatically Detecting
Wavelength on page 15), the power meter automatically matches the
source wavelength.
I
MPORTANT
The value sent is not (and will not affect) the source’s actual power.
It is a user-defined value that may not take the optical link’s loss into
account.