YOKOGAWA AQ7280 User Manual

1-2
IM AQ7280-01EN
OTDR Unit
Install the OTDR unit into the mainframe to use the AQ7280 as an OTDR. There are several types
of OTDR units available for different wavelengths, dynamic ranges, and the like. You can choose
the one that suits your application.
Based on user input through the mainframe, the light emitter (LD; laser diode) is driven, and
the generated optical pulse is emitted from the OTDR port into the optical fiber cable under
measurement.
The backscatter and reflected light that occur in the optical fiber cable under measurement returns
to the OTDR port. The returned measurement light is received by the light detector (APD: Avalanche
photodiode), read as a digital signal by the A/D section, subjected to averaging and other waveform
processing, and output to the mainframe where the OTDR waveform is displayed.
With the light source option (/SLS), based on user input through the mainframe, the light emitter (LD;
laser diode) is driven, and CW or CHOP measurement light is emitted.
With the optical power checker option (/PC), the communication light (fiber in use) present in
the optical fiber cable under measurement is detected at the OTDR port, and its power level is
measured.
OPM Module
Install the OPM module into the mainframe to use the AQ7280 as an optical power meter (OPM).
The measurement light applied to the optical port is received by the light detector (PD: photodiode),
read as a digital signal by the A/D section, and output as measured values to the mainframe where
they are displayed.
Modules with the visible light source function (AQ2780V, AQ2781V) can emit visible light like the
VLS module. The wavelength of the visible light source is 650 nm.
VLS Module
The VLS (visible light source) module is designed to test for breaks, connections, losses, and the
like in optical fiber networks. It can be used as a visible light source by installing it as an option to
the AQ7280 OTDR mainframe. The wavelength of the visible light source is 650 nm.
OTDR Features
OTDR stands for optical time domain reflectometer. The AQ7280 displays waveforms that you can use
to detect fault locations in optical fiber cables and monitor fault conditions (transmission loss, splice
loss, etc.). It is mainly used in the following optical fiber cable installation and maintenance situations.
• Access network connecting telecom carriers and subscribers, including service providers (SM
1
optical fiber cable)
• Core network between telecom carriers (multi-core SM optical fiber cable)
• Local area network in buildings (MM
2
optical fiber cable)
1 SM: Single mode
2 MM: Multi mode
Optical Pulse Measurement
• Averaged Measurement
A measurement in which measurements are taken several times and the measured values are
averaged to display the result.
• Icon Display of Results after Averaged Measurement (/SMP option)
After averaged measurement is performed, the OTDR waveform is automatically analyzed, and
the results are displayed using icons for each event type. To use this feature, start OTDR Smart
Mapper from the top menu.
• Display of the Distances to Breaks after Averaged Measurement
After averaged measurement is performed, the OTDR waveform is automatically analyzed,
breaks (faults) are detected, and the distances to the breaks are displayed. To use this feature,
start Fault Locator from the top menu.
1.1 Overview

YOKOGAWA AQ7280 Specifications

General

Brand	YOKOGAWA
Model	AQ7280
Category	Measuring Instruments
Language	English