November (2016) – Yokogawa Europe unveiled
the AQ7277B, a high-performance optical time-domain reflectometer (OTDR) module
for use with remote fiber-test systems (RFTS).
An RFTS is a test system designed to
improve the efficiency of operation and maintenance management of optical fiber
lines, which are installed at a fiber-optic cable termination station. The
system works by constantly monitoring individual fibers in the cable using the
OTDR technology for continuous measurements and is able to indicate a failure
location on an electronic map. Having done so it then notifies maintenance
staff.
The test system is intended to speed
up the identification and location of failures (such as increased loss, fiber
breaks and water ingress) and it also enables a maintenance center to test the
installed equipment as a remote manual test during cable installation. The
ability to perform automatic testing of multiple fibers at once saves
installation labor time and costs and reduces the overall work period required.
According to the
company, the time saved by using an RFTS to locate and isolate the first fiber
break can pay for itself by yielding a full return on investment and achieving
a higher level of customer satisfaction through improved quality of service.”
The hardware of
the AQ7277B OTDR module is based on Yokogawa’s AQ7280 OTDR, using its optical
performance in terms of short dead zone (0.6 m typical) and high dynamic range
(up to 50 dB). Moreover, its size is reduced by 60% compared to its
predecessor, which improves its integration into the RFTS. Its dimensions are
now 230 mm (W) × 50 mm (H) × 140 mm (D), and weight is approximately 1 kg.
There are two
models in the AQ7277B family, both equipped with an Ethernet
(10BASE-T/100BASE-TX) interface as standard. The AQ7277B-B01 takes measurements
at 1650 nm, a wavelength that does not affect the communication wavelengths of
1310/1490/1550 nm. It is equipped with a built-in cutoff filter to isolate it
from wavelengths lower than 1650 nm, and so can perform accurate measurements
on “live” lines (where active communication signals are traveling). This model
is also optimized for testing passive optical networks (PON), and can measure
through the high-port-count splitters used in modern PON systems.
The AQ7277B-B02
is designed for monitoring long-distance optical fibers – greater than 200 km
in real-life environmental conditions - -being capable of a 50 dB dynamic
range. It operates at a wavelength of 1550 nm.
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