Optical time domain reflectometry is used to test optical fibers and their function.
Optical Time Domain Reflectometers (OTDRs) function to characterize optical fibers by sending series of optical pulses into fibers, extracting light that scatters or reflects at points in the fibers, then measuring and integrating and plotting the return pulses and their strength.
Yokogawa offers remote controllers for remote use of OTDR via computer.
High performance OTDR module for RFTS (Remote Fiber Test System)
The AQ7277B is OTDR modules for RFTS (Remote Fiber Test System) including features required for monitoring fibers.
-High-speed data transfer
The Ethernet (10BASE-T/100BASE-TX) interface achieves high-speed data transfer.
-Maintenance wavelength which has no influence to live communications
OTDR with the maintenance wavelength (1650 nm) enables the monitoring of live communications line.
A built-in cut filter reduces an impact of communications signals on the measurement.
-Available for test through high-port-count splitters
Supports the measurement of the PON system including high-port-count splitters.
The volume is reduced by 60% compared to the existing model (AQ7277).
The mountability in the RFTS is improved.
In addition to the model of the maintenance wavelength (1650 nm), there is a model of 1550 nm (DR 50 dB) which supports long distance measurement.
|Wavelength||1650±5 nm||1550±25 nm|
0.2, 0.5, 1, 2, 5,
10, 20, 30, 50,
100, 200, 300,
400, 512 km
3, 10, 20, 30, 50,
100, 200, 300, 500,
1000, 2000, 5000,
10000, 20000 ns
|Sampling resolution||Min. 2 cm|
|Dynamic range||40 dB (typ.)||50 dB (typ.)|
|Event dead zone||0.6 m (typ.)||0.6 m (typ.)|
|Attenuation dead zone||4 m (typ.)||4 m (typ.)|
±0.75 m ± measurement
distance x 2 x 10-5 ± 1
|Number of sampling data||Max. 256,000 points|
|Remote control interface||
USB2.0 (Type B mini)
LED drive signal
|Environmental Conditions||Operating temperature||-10 to 50 °C|
|Storage temperature||-20 to 60 °C|
0 to 90% RH
|Power requirements||12 VDC 2.5 A or less|
|Dimensions and Weight||
230 mm (W) × 50 mm (H)
× 140 mm (D), Approx. 1 kg
|Laser safety standards||Class 1 (IEC 60825-1)|
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