Tel: (888) 545-1254 • Fax: (415) 358-4602 • Email: [email protected]
www.PrecisionRatedOptics.com
66
12.3 Measuring Insertion Loss (2-Point and 5-Point method)
Insertion Loss
(unit: dB) is calculated by measuring the signal level of Rayleigh Back Scatter (RBS) and
the magnitude of reduction. Insertion loss can be created by reflection and non-reflection events.
The system calculates (in real-time) the loss between Markers A and B, and also calculates the insertion
loss at Marker A or B. Insertion loss is calculated in a 5-Point method.
2-Point Method (A-B Loss):
Insertion loss is calculated as shown in Fig. 12.2.
The 2-Point method is suitable for measuring splice loss, but not applicable to measuring reflection
events.
Note:
●
”A-B Loss” is for quick loss measurement of a specific segment of the fiber, marked between Marker
A and B.
●
“A-B Loss” is not applicable to measuring “Reflection” events.
Fig 12.2 2-Point Loss
12 Manual Trace Analysis