2-3
IM AQ1210-01EN
Setting Up the OTDR Feature
2
Explanation
Wavelength
You can enter the following wavelengths.
Model Optical Pulse Wavelength
AQ1210A 1310 nm, 1550 nm, 1310 nm/1550 nm (multi wavelength measurement)
AQ1215A 1310 nm, 1550 nm, 1310 nm/1550 nm (multi wavelength measurement)
AQ1210E 1310 nm, 1550 nm, 1625 nm, 1310 nm/1550 nm (multi wavelength measurement)
AQ1215E 1310 nm, 1550 nm, 1625 nm, 1310 nm/1550 nm (multi wavelength measurement)
AQ1215F 1310 nm, 1550 nm, 1650 nm, 1310 nm/1550 nm (multi wavelength measurement)
AQ1216F 1310 nm, 1550 nm, 1650 nm, 1310 nm/1550 nm (multi wavelength measurement)
1310 nm/1550 nm (multi wavelength measurement)
In a single measurement, 1310 nm and 1550 nm are measured one at a time.
If 1310 nm/1550 nm is selected, the wavelength of optical pulse being measured is displayed on the
screen.
Distance Range
Set the distance range according to the length of the optical fiber cable. The distance range that you
can select varies depending on the wavelength. Specify a distance range value that is greater than
the length of the optical fiber cable that you will measure. If you specify a shorter value, the instrument
will not be able to perform measurements properly. The longer the distance that you specify, the more
time measurements will take. When you specify the distance range, the optimum pulse width and
attenuation values are set automatically.
Cable Length Distance Range Cable Length Distance Range
Unknown Auto 16 km to 24 km 30 km
0 m to 160 m 200 m 24 km to 40 km 50 km
160 m to 400 m 500 m 40 km to 80 km 100 km
400 m to 800 m 1 km 80 km to 160 km 200 km
800 m to 1.6 km 2 km 160 km to 240 km 256 km, 300 km
1.6 km to 4 km 5 km 240 km to 320 km 400 km
4 km to 8 km 10 km 320 km to 400 km 512 km
8 km to 16 km 20 km
Pulse Width
The pulse width has the following characteristics.
• A short pulse width enables you to measure with a high resolution, but you cannot measure long
distances.
• A long pulse width enables you to measure long distances, but you cannot measure with a high
resolution. Also, dead zones are larger with long pulse widths.
The pulse widths that you can select vary depending on the distance range, as shown in the
following table.
Distance Range Selectable Pulse Widths
200 m 3 ns/5 ns
1
10 ns 20 ns 30 ns 50 ns 100 ns 200 ns 300 ns 500 ns
500 m 3 ns/5 ns
1
10 ns 20 ns 30 ns 50 ns 100 ns 200 ns 300 ns 500 ns
1 km 3 ns/5 ns
1
10 ns 20 ns 30 ns 50 ns 100 ns 200 ns 300 ns 500 ns 1 µs
2 km 3 ns/5 ns
1
10 ns 20 ns 30 ns 50 ns 100 ns 200 ns 300 ns 500 ns 1 µs
5 km 3 ns/5 ns
1
10 ns 20 ns 30 ns 50 ns 100 ns 200 ns 300 ns 500 ns 1 µs
10 km 3 ns/5 ns
1
10 ns 20 ns 30 ns 50 ns 100 ns 200 ns 300 ns 500 ns 1 µs
20 km 3 ns/5 ns
1
10 ns 20 ns 30 ns 50 ns 100 ns 200 ns 300 ns 500 ns 1 µs 2 µs
30 km 10 ns 20 ns 30 ns 50 ns 100 ns 200 ns 300 ns 500 ns 1 µs 2 µs
50 km, 100 km 20 ns 30 ns 50 ns 100 ns 200 ns 300 ns 500 ns 1 µs 2 µs 5 µs 10 µs 20 µs
200 km 30 ns 50 ns 100 ns 200 ns 300 ns 500 ns 1 µs 2 µs 5 µs 10 µs 20 µs
300 km 50 ns 100 ns 200 ns 300 ns 500 ns 1 µs 2 µs 5 µs 10 µs 20 µs
1 The pulse width is 5 ns on the AQ1210A/AQ1210E and 3 ns on the AQ1215A/AQ1215E/AQ1215F/AQ1216F.
2.1 Measurement (Measure) Conditions
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