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OPTICAL MEASURING INSTRUMENTS
• MW0967B high-resolution unit
Wavelength*1
850/1300 nm ±15 nm
Fiber under measurement*10
50/125 µm GI multimode fiber (NA0.2) ITU-T G.651
Optical connector*11
FC, DIAMOND, ST, DIN, SC
Pulse width
Dynamic range oneway back-scattered
light level*3,*4
5 ns
20 ns
100 ns
500 ns
2 µs
Effective
9.0/7.0 dB
12.0/10.0 dB
15.5/13.5 dB
19.0/17.0 dB
21.5/20.0 dB
15.0/13.0 dB
18.5/16.5 dB
22.0/20.0 dB
24.5/23.0 dB
SNR=1
12.0/10.0 dB
Dynamic range (4%
Fresnel reflection)*4
Effective
27/29 dB
SNR=1
30/32 dB
Near-end dead
zone*5,*6
Fresnel reflection
Spatial
resolution*5,*7
32/34 dB
1.5 m
1.5 m
1.5 m
1.5 m
Back-scattered light
3m
4.5 m
15 m
60 m
220 m
Fresnel reflection
2m
4m
15 m
60 m
220 m
Back-scattered light
2m
4m
15 m
60 m
220 m
Not provided
Variable optical output power function
Provided
Distance range (km)*5
10, 25, 50, 100
2.5, 5, 10, 25, 50, 100, 250, 500, 1 km (10 km range)
2.5, 5, 10, 25, 50, 100, 250, 500, 1 km, 2.5 km (25 km range)
2.5, 5, 10, 25, 50, 100, 250, 500, 1 km, 2.5 km, 5 km (50 km range)
2.5, 5, 10, 25, 50, 100, 250, 500, 1 km, 2.5 km, 5 km, 10 km (100 km range)
Sampling resolution: 5 cm to 20 m
Read-out resolution: 5 cm to 200 m
Scale (m/div)
Horizontal axis*5
Resolution
Accuracy
±1m ±measured value (m) x 2 x 10–5 (does not include uncertainty fiber index of refraction)
Scale (dB/div)
0.1, 0.25, 0.5, 1, 2.5, 5
Readout resolution
0.001 dB
Linearity
±0.05 dB/dB
Ambient temperature
–10° to +55°C (spec. meet), –40° to +75°C (storage)
Mass
≤2.5 kg
Not applicable in the variable optical output power mode
*1:2: Please
specify one of these types when ordering. Please contact us for other
* connectors.
(However, the dynamic range is degraded by 0.5 dB for DIAMOND
*
29/31 dB
1.5 m
Mask function
Vertical axis
*
and D4 connectors.)
3: Dynamic range (one-way back-scattered light)
Effective: The difference between the level of the point which is 0.3 dB higher than
the peak noise level and the level of the point where near-end back-scattering occurs.
SNR=1: The level difference between the RMS noise level and the level where
near end back-scattering occurs.
resolution
*7: Spatial
Fresnel reflection: The width of an unsaturated Fresnel reflection pulse at the
point that is 1.5 dB less than the peak value.
Back-scattered light: The distance between the points where the beginning and
ending levels at a splice etc. (≤1 dB) are within ±0.1 dB of their initial and final
values, respectively.
Spatial resolution (Fresnel reflection)
Level
Effective
1.5 dB
SNR = 1
0.3 dB
±0.1 dB
Distance
are obtained using smoothing (level 6). With no smoothing, all values are
*4: Values
reduced by 2 dB.
the index of refraction is set to 1.500000.
*5:6: When
Near-end dead zone
* Fresnel
reflection: The minimum distance at which the 4% Fresnel reflection
generated by the fault can be detected. (MW0944B with built-in variable optical
output power function used.)
Back-scattered light: The near-end dead zone (for back-scattered light) is the
distance at which the near-end back-scattered light level approaches ±0.5 dB
of its final value. — For the MW0944B: This specification represents the values
for the FC-PC connector (when return loss ≥25 dB). When a fiber with an FC
connector (flat polished) is measured, the dead zone may be larger than the
specified value. The variable near-end mask width function can be used to suppress dead zone widening to 2 to 3 m.
≤1 dB
±0.1 dB
Spatial resolution (back-scattered light)
masks including the near-end mask (except MW0945B, MW0946B and
*8: All
MW0947B) are OFF in the variable optical output mode.
9: Please specify one of these types when ordering. Please contact us for other
* connectors. (However, the dynamic range is degraded by 0.5 dB for DIAMOND,
D4, and AT&T Biconic connectors.)
±0.5 dB
The dynamic range is increased by about 1.5 dB when measuring 62.5/125 µm
*10: (NA
0.29) fibers. The transmission loss measurement result may differ from that
obtained with NA 0.29 by as much as 0.1 dB/km.
Level
Please specify one of these types when ordering. Please contact us for other
*11: connectors.
Distance
Dead zone (back-scattered light)
62