User's Manual
ModuLite Installation Guide OPTICAL TEST PROCEDURE
Foxcom Wireless Confidential and Proprietary Information
Document No. 43-93-005-05 y 58
8.5. 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.
Figure 34: Optical Return Loss Measurement
8.5.1. Measurement Procedure
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.
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).
Measuring Return Power
To measure return power:
•
Move light source from connector #3 to connector #1.
Light
source
Optical
power
meter
IN OUT
(pigtail)
Cable Being Tested
2
1
3
4
"Optical Terminator"
Optical Coupler