AFL M310 - OPM Operation - Testing Multimode;Single-mode Fibers; Set Reference (One Jumper Method)

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Step I - Set the Reference (One Jumper Method)
OPM Operation - Testing Multimode/Single-mode Fibers
1. From the OTDR Main Menu, select the OPM (optical power meter) test mode. Turn on your
OLS (optical light source) and allow the light source to stabilize (minimum of 15 minutes).
2. If not using the Wave ID feature, set both instruments to the desired test wavelength.
3. Select the appropriate ber optic transmit and receive test jumpers. The ber type of these
jumpers must match the ber type of the link to be tested. Perform one of the following:
• For Multimode testing: wrap and secure the transmit jumper ve times around the
appropriate diameter mandrel.
• For Single-mode testing: make a loop in a transmit jumper and secure it with a piece of tape.
TIA testing - 30 mm loop. IS0 testing - 30-50 mm loop
Note: Clean both ends of the transmit jumper.
4. Connect the transmit jumper to the appropriate (MM or SM) output port of the OLS.
5. Mount an adapter cap on the OPM port that matches the free connector on the transmit
jumper.
6. Connect the free end of the transmit jumper to the OPM port.
7. If measured output power is outside of the normal range (specied by manufacturer), clean all
ber connections or replace the transmit jumper. Repeat steps 4 - 7.
8. To set the reference level at the current wavelength, perform the following:
• On the equipment operating in OPM mode, press the Reference soft key, select Set Ref, then
press key.
• The Reference value will be displayed briey in dBm (µw).
• Then the screen will toggle to display Loss values of the active wavelength (typ. 0.00 dB).
Step II - Verify Test Jumpers
9. Disconnect the transmit jumper from the OPM test port.
Note: Do not disturb the transmit jumper at the OLS end.
10. If necessary, change the OPM adapter cap to match the connector on the receive jumper that
will be connected to the OPM test port.
Note: Clean both ends of the receive jumper.
11. Connect the receive jumper to the OPM test port.
12. Mate the free ends of the transmit and receive jumpers using an appropriate adapter.
13. Verify that the insertion loss of this mated connector pair is under 0.75 dB, the maximum
allowed by the TIA and ISO (AFL recommends 0.4 - 0.5 dB typical), as follows:
• Observe the displayed loss level. This is the mated connector pair insertion loss of the test
jumpers in dB.
• If the insertion loss is not acceptable, disconnect the transmit and receive jumpers at the
adapter, clean the free ends of both test jumpers and repeat steps 12 and 13.