Appendices
MobileAccess™ 1000/1200
30
UM-1000, Revision 2.2
4.1.6 Optical Return Loss Measurement Test
Connection description: Connect a light source and optical power to the inputs. If the
coupler has one output, connect the tested cable to this output. If the coupler has
two outputs make a pigtail at the second output.
Light
source
Optical
power
meter
IN OUT
(pigtail)
Cable Being Tested
2
1
3
4
"Optical Terminator"
Optical Coupler
Figure
4-3: Optical Return Loss Measurement
4.1.7 Measurement Procedure
4.1.7.1 Measuring Power Input To Cable Being Tested
•
Verify that light source power is at 0dBm.
•
Connect a light source to connector #1.
•
Connect optical power meter to connector #3.
•
Measure signal power (P3), power should be approximately –4dBm.
4.1.7.2 Measuring Coupler Power Loss
•
Move power meter from connector #3 to connector #2.
•
Move light source from connector #1 to connector #3.
•
Measure power loss of coupler (Lc).
4.1.7.3 Measuring Return Power
To measure return power:
•
Move light source from connector #3 to connector #1.
•
Connect cable being tested to output connector #3.
•
If coupler has two outputs, then make a pigtail at second output.
•
If cable is longer than 100 meter, then cable needs to be isolated.
Summary of Contents for 1000 System
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