Fluke OF-500 OptiFiber, Техническое справочное руководство

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OF-500 OptiFiber Certifying OTDR
Technical Reference Handbook
11-22
OTDR Specifications for OFTM-573x Singlemode Modules (cont.)
Event deadzones
1
1310/1550 nm: 1 m typical
Attenuation deadzones
2
1310/1550 nm: 8 m typical
Maximum measurement range
3, 4
1310 nm: 60 km
1550 nm: 60 km
1. For singlemode: measured at 1.5 dB below the reflection peak for a
typical singlemode UPC connector (< -50 dB reflection using 5 ns pulse
width). Refer to Figure 11-1.
2. For singlemode: measured at
±
0.5 dB beyond the backscatter for a
typical singlemode UPC connector (< -50 dB reflection using 20 ns
pulse width). Figure 11-1.
3. For typical fiber with backscatter coefficients of -77 dB at 1310 nm and
-82 dB at 1550 nm.
4. Distance ranges for loss in a typical fiber. Greater than 3 dB above the
noise floor at 60 km.
5. EDZ: Event deadzone. ADZ: Attentuation deadzone. EDZ is valid only
for Fresnel (non-saturating) reflections.
ajt73
f.eps
Figure 11-1. Event and Attenuation Deadzone
Measurement Methods
5
-continued-