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OCC-CWDM-301-18
3.3 Measurement Application of OTDR
OTDR displays power relating to distance of returning signals. This information can be used to identify the main
properties of an optic fiber chain.
3.3.1 Measurement Contents of OTDR
•
Event location (distance), end or rupture of optic fiber chain
•
Attenuation coefficient of fiber
•
Loss of a single event (for example, one optic tie-in), or total loss from upper end to end
•
Range of a single event like reflection of connectors (or grade of reflection)
•
Auto measurement of cumulative loss of a single event
3.3.2 Trace Analysis of OTDR
The trace analysis of OTDR is fully automatic. The trace locates:
•
Reflection events of connections and mechanic tie-ins
•
Non-reflection events (usually at welding tie-ins)
•
End of optic fiber.
Through scanning the first loss event that is larger than end threshold, end of optic fiber can be identified.
•
Events list
,
event type, loss, reflection and distance.
3.4 Trace Display Screen of OTDR
Trace displays on OTDR screen, as in Figure 3-3.
Figure 3-3. Trace Display Screen
8 Km/Div
5 .00dB /Div
trace 1
No.: 2/ 4
Attn .:0 .220
Location : 25. 308km
Refl .:- 38. 12dB
Ins .l: 0. 85dB
Cum .l: 5. 57dB
Menu
Bar
Trace
Display
Window
Information
Window
B
A
Event