Definition of Terms / Measurement Conditions CSpecifications
E6000C Mini-OTDR User’s Guide, E0302
199
L
OTDR
= the distance measured with the OTDR, at the
given OTDR group index setting
T = time of flight between the two locations on the fiber,
measured at the wavelength of the OTDR
N = OTDR group index setting
NOTE Relatively long lengths of fibers, for example, 10 km, are
to be used to evaluate the distance scale error, in order to
remove the influence from finite distance sampling
spacing.
NOTE The distance scale error excludes the uncertainty of the
fiber’s group index, N, because the same N is used in the
calculation of L and L
OTDR
.
Measurement: Measure the time of flight, T, with a pulse
generator, a laser source, an opto-electronic converter,
and a time interval counter by determining the time
difference with and without the fiber of length L inserted.
The laser source should have the same wavelength as the
OTDR.
Dynamic range (RMS)
The amount of fiber attenuation that causes the
backscatter signal to equal the
→noise level (RMS).
Measurement: It is recommended to connect a standard
single mode fiber with a length of more than 20 times the
pulse width in meters to the OTDR. Then determine the
difference between the extrapolated backscatter trace (as
in Figure 2) and the
→noise level (RMS).
Conditions: standard single mode fiber, at specified
averaging time, ambient temperature and instrument
settings.
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