C Specifications Definition of Terms / Measurement Conditions
196 E6000C Mini-OTDR User’s Guide, E0302
Measurement: Select Optimize Resolution for best
accuracy. Since the precise location of the front panel
connector is usually not directly accessible, use a short
reference fiber (for example, 100 m, to exclude any
influence from distance scale error) with known length L
and open end to create a reflective event. Then measure
the length of the fiber by determining the location of the
reflective event L
OTDR
as shown in Figure 4. Then
calculate the distance offset error
∆L
0
by subtracting the
measured length from the known length, L.
and:
L = known length of the fiber = (c T)/N.
c = speed of light in vacuum
T = time of flight between the two locations on the
reference fiber, measured at the wavelength of the OTDR
N = group index of the fiber (use the OTDR’s
→group
index setting)
L
OTDR
= the distance measured with the OTDR, at the
given
→group index setting
where
OTDR
ref
LLL −=∆
0
N
Tc
L =
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