Yokogawa Releases OTDR Module for Remote Fiber Test Systems

  • Yokogawa Test & Measurement
AMERSFOORT, THE NETHERLANDS — Yokogawa Europe, a provider of optical testing equipment, announced the new AQ7277B high-performance optical time-domain reflectometer (OTDR) module for use with remote fibre-test systems (RFTS).

An RFTS is a test system designed to improve the efficiency of operation and maintenance management of optical fiber lines installed at a fiber-optic cable termination station by constantly monitoring individual fibers in the cable using the OTDR technology for continuous measurements. The system indicates the failure location on an electronic map and notifies the maintenance staff by means of e-mail or telephone.

Speeding Up the Identification and Location of Failures
As a result, it speeds up the identification and location of failures (such as increased loss, fiber breaks and water ingress) and facilitates restorative maintenance. It also enables the 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.
Today’s regulatory regime has made it more important than ever for telecom carriers to proactively monitor and maintain their fiber networks. In particular, the huge penalties specified in service level agreements and quality of service commitments give carriers financial incentives to invest in maintaining their fiber networks.

“Detecting fiber degradation before failure while reducing mean time to repair is key to succeeding in today’s competitive business environment,” says Terry Marrinan, Vice-President, Test & Measurement, Europe & South East Asia, for Yokogawa Test & Measurement Europe, “and 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 established AQ7280 OTDR, with its optical performance of short dead zone (0.6 m typical) and high dynamic range (up to 50 dB). Moreover, its size is reduced by 60 percent compared to its predecessor, which improves its integration into the RFTS. Now its dimensions are 230 mm (W) × 50 mm (H) × 140 mm (D), and weight is approximately 1 kg.

The AQ7277B-B01 Model
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 which 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 Model
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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