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Fiber Optic Test Meters • Operation 15
2. Insert the link to be tested by connecting it to the free ends of the transmit and receive
reference cables using appropriate couplings, or connect the reference cables to the
bulkhead connections of the link as shown in figure 10 below.
NOTE: Clean reference cable and link ends prior to each test.
3. Observe the displayed values. The link cable insertion loss is displayed in dB.
NOTE: If either the light source or power meter has shut off, turn it back on
and allow to stabilize for a minimum of two minutes.
The two examples in figure 10 below show a multimode and singlemode fiber link being
tested using dual WAVE ID. The insertion loss is displayed in dB.
In the multimode example, the FLS 101 is transmitting both 850 nm and 1300 nm
wavelengths. The FPM 101 has automatically detected the wavelengths using WAVE ID
and is reading a 3.65 dB loss for the 850 nm and 4.07 dB for 1300 nm.
The singlemode example, also using dual WAVE ID, is reading a 1.45 dB loss for the
1310 nm wavelength and 1.49 dB for 1550 nm.
FLS 101
Fiber Optic
Light Source
Singlemode Fiber under Test
Coupler
or
Bulkhead
Mandrel
Multimode Fiber under Test
FPM 101
Fiber Optic
Power Meter
Transmit Reference
Cable
Receive
Reference Cable
Transmit Reference
Cable
Receive
Reference Cable
FLS 101
Fiber Optic
Light Source
FPM 101
Fiber Optic
Power Meter
Coupler
or
Bulkhead
Coupler
or
Bulkhead
Coupler
or
Bulkhead
9V
850nm1300nm 1310nm1550nm
Tone
1310nm
1550nm
850nm
1300nm
CWCW
FIBER OPTIC LIGHT SOURCE
Extron
dB
dBm
Ref
Set
Extron
Optical Power Meter
WAVE ID
9V
850nm1300nm 1310nm 1550nm
Tone
1310nm
1550nm
850nm
1300nm
CWCW
FIBER OPTIC LIGHT SOURCE
Extron
dB
dBm
Ref
Set
Extron
Optical Power Meter
WAVE ID
nm
dB
nm
dB
nm
dB
nm
dB
WAVE ID
nm
dB
nm
dB
850
3.65
1300
4.07
WAVE ID
nm
dB
nm
dB
1310
1.45
1550
1.49
FLS 101
FIBER LIGHT SOURCE
MM SM
POWER
FLS 101
FIBER LIGHT SOURCE
MM SM
POWER
POWER
FPM 101
FIBER POWER METER
POWER
FPM 101
FIBER POWER METER
Figure 10. Connections to Measure Link Insertion Loss