EXFO OTDR 2 - Manual (Page 165)

Using the OTDR as a Light Source
OTDR 157
5. Select the desired modulation.

For loss measurement, with a power meter at the other end, select
Continuous.

For fiber identification, select 1 kHz or 2 kHz. This will allow the
person at the other end of the link to identify the fiber under test,
which could be particularly useful when working with cables
containing many fibers.
For easier fiber identification, the application also offers a flashing
pattern. If you select this pattern, the modulated signal (1 KHz or
2 KHz) will be sent for 1 second, then will be off for the next
second, then be sent again for 1 second, and so on. If you want the
OTDR to emit light in a flashing pattern, select 1 kHz+Blink or
2 kHz+Blink.
I
MPORTANT
OTDR can be used in continuous source mode (CW) to perform
optical power measurements and it is compatible only with the
following: high power Germanium (GeX) versions of the 300 and
600 Series, as well as any unit’s built-in GeX power meters.
The EPM-50 power meter is not compatible for measurements using
an OTDR in Continuous setting.