Notice: This product was discontinued on 11/19/2009.
Optical Time Domain Reflectometer AQ7275 is a replacement product.

The AQ7270 OTDR maximizes the total working time during on-site tests as the time to power up the device, make measurements, and analyze and store the measurement results are significantly reduced. The measurement results can easily be transmitted to computers using the USB interface or the Ethernet. The analysis software (optional), helps with preparation of computer-generated reports.

See more images:


The AQ7270 OTDR condenses the total working time during on-site tests as the time to power up the device, the time taken to make measurements, and the time to analyze and store the measurement results are reduced significantly. The measurement results can easily be transmitted to computers using the USB interface or the Ethernet and the analysis software (optional) helps with preparation of reports on a computer. 

  • World's Shortest Dead Zone*: <0.8m (2.7 ft)
  • Enables multiple close range event detection
  • Tests Up to Four Wavelengths
  • 850/1300/1310/1490/1550/1625/1650nm and more
  • Multiple Functions
  • Optical Monitor, Light Source, Built-in printer, Built-in Dummy Fiber and more
  • Large and Bright 8.4” LCD on a lightweight, compact, and solid body
  • Less than 10 sec. Power-up Time
  • Enables users to start testing in just seconds
  • One Button Testing
  • Executes programmed procedure to improve productivity drastically
  • A powerful tool for analyzing, reporting, and printing OTDR test data
  • AQ7932 OTDR Emulation Software


Superior cost performance, easy to operate.
Makes your work more efficient.

Meets fiber testing needs from FTTH to Metro networks!

J013 Tm Aq7270 02

From 1- to 4-wavelength models

The AQ7270 comes in eleven models combining different measurement wavelengths and dynamic ranges. Supported wavelengths: 1310, 1490, 1550, 1625, 1650 nm (single mode), 850, and 1300 nm (multi mode).

World's Shortest Dead Zone*: <0.8m (2.7 ft)

J013 Tm Aq7270 03

Accompanying the rapid proliferation of FTTH is a growing need for detection of reflective events arising from shortdistance mechanical connections

.The AQ7270's event dead zone is the shortest in the world, enabling detection of closely spaced events.

*: Based on company research of the field use OTDR, as of November 2006
                                                                                                              a fiber testing with 1m span connectors

High Dynamic Range up to 40dB

J013 Tm Aq7270 04

The high dynamic range of the AQ7270 enables accurate measurement of optical fibers in short periods of time. This makes it a powerful tool for evaluation of metro networks with relay distances in excess of 100 km, or FTTH (PON) and other short optical fiber networks with large insertion loss originating from optical couplers.

                                                                                                                            a 164km single-mode fiber testing

Less than 10 sec. Power-up Time

It's ready when you're ready!

Now measurements can be started quickly upon arrival at the site. 10 seconds to power-up from completely OFF to fully ON! With such a fast power-up time, battery life can be extended by turning the power off while not in use at the job site without any concern about the power-up time when the next job is ready. It's ready when you're ready!

The worldwide spread of broadband services has stimulated the installation of optical fiber in metro and access networks, which in turn has increased the demand for portable and reliable test equipment to aid the installation and maintenance of these networks.
Our new OTDR has been developed to address these challenges with particular aims of improving operability to boost work efficiency and cost-effectiveness.
The AQ7270 carries forward the basic operation of its predecessors (the AQ7250 and AQ7260 OTDR), while adding a Detail mode for trained technicians with functions for setting of measurement conditions and performing manual measurements.

Automatic Setting of Measurement Conditions -Full Auto Mode-

Simply choose the measured wavelength, then press a button.

J013 FullAuto

Multi Wavelength Measurement is a mode in which multiple specified wavelengths are measured automatically, in order. You can also specify to perform analysis or file saving as needed for each measurement.

Measurement with Auto Wavelength Switching -Multi Wavelength Mode

Prepare multiple wavelengths to measure, then press a button.

J013 MultiWavelength

Multi Wavelength Measurement is a mode in which multiple specified wavelengths are measured automatically, in order. You can also specify to perform analysis or file saving as needed for each measurement.

Macro's Measurement with Predefined Procedures –One Button Mode

Simply choose previously set measurement procedures, then press a button.

J013 OneButton

You can execute up to five saved measurement procedures in order. A batch of measurement procedures can be run directly from the main menu. Measurement and analysis conditions can be read from a file, making it easy to set up the measurement procedures.

Easy Operation with the Assistance Function!

Assistance Setting Up Measurements –Measurement Wizard

Displays detailed explanations of parameters in the measurement conditions setting menu, and gives guidelines for setting methods. This function assists unskilled users.

J013 Wizard2


J013 Wizard
Measurement Wizard Menu

Active Line Alarm

Never disturb communication lines
There may be concern that technicians inputting the OTDR measurement signal into the communication line could cause communication errors.
The live line alarm monitors the fiber’s optical power level and diplays an alarm message if it detects optical power at or higher than a specified threshold level, in order to warn the technician not to mistakenly feed the signal into the communication line.

J013 Alarm

Active Line Alarm Message

Plug Check Function

Never spoil measurements with poor connections or dirty plugs

The plug check function monitors the condition of the OTDR's optical input/output connectors and displays an alarm if the connection is not properly made. This function is useful for checking for damage, dirt, or other problems with optical plugs at the OTDR or on the fiber under test, and for helping technicians to remember to connect the fiber under test.

J013 Plug Check

Plug Check Alarm Message

Fault Event Display Function

Detecting Abnormal Events

J013 Fault Event

The fault event display function detects abnormal connection or reflection points and displays them. Of the events detected by the event detection function, abnormal events that cross a specified threshold value are highlighted in the event table and waveform display.

Trace Fix Function

Measurement with Comparison to a Reference Trace

You can freeze the display of one trace and overlap it with real time or averaged waveforms for comparison.
This is useful to create a template when installing multicore fiber, or for checking aged deterioration during maintenance on existing fiber networks. In addition to the last-measured waveform, a waveform can be loaded from a file to be used as the reference waveform.

J013 Trace Fix

Trace Fix Function

Setup Key

Jump to Measurement Condition Settings
With the new SETUP button on the front panel, it is easy to move to the measurement condition setting menu.

J013 Setup

Trace Analysis Functions

Multi Trace Analysis
For Evaluation of Multicore Fiber
Up to four traces can be overlaid on the display for analysis and comparison.

This is useful for evaluating connection point locations and loss after installing multicore fiber.

Multi Trace

2 Way Trace Analysis

For Accurate Splice Loss Measurement
by Bi-directional Testing
Merges the two traces measured from both directions and finds the correct splice loss.

Connection point loss in lines where optical fibers of differing backscatter coefficients are connected can differ depending on the direction. In such cases, you can accurately determine the loss by measuring in both directions and taking an average.


Differential Trace Analysis

For Evaluation of Aged Deterioration
Displays the difference between two specified traces.

Makes it simple to check aged deterioration of fibers or connection points, or fluctuation in loss between fibers, and other phenomena.


Section Analysis

For Evaluation of Total Return Loss

Finds the total return loss in specific portions of the fiber.

This type of evaluation is often requested because the multiple reflections from optical fiber networks can affect signal light from transmitters (cable TV etc.).


Smart File Function


Because the AQ7270 makes it easy to differentiate between measured optical fibers-even complex ones-you can add arbitrary information to file names such as measured wavelength, ID number, tape number, or comments. You can also have the ID number or tape number automatically updated and saved after each measurement.
Trace data can be saved in SOR and CSV format. Also, you can save screens as BMP, JPG, or PNG files. TRB or TRD files saved on Yokogawa's previous AQ7250 and AQ7260 models can also be loaded.

Language Selection

In addition to English (standard), you can select a display language of French, German, Chinese, Korean, Russian, and others.

USB Function

USB connectivity makes it more convenient to output to external memory or printers, and to set up communication. The AQ7270 comes standard with two USB1.1 compliant connector ports (Type A and Type B).

Saving Files to USB Memory-Type A

Using USB memory or a USB hard disk, you can save large amounts of data. Also, you can easily transfer saved data to a PC or other device.

Printing on an External
Printer - Type A

You can print screen images or measured data on USB printers.

Remotely Controlling the
AQ7270 from a PC - Type B


The AQ7270 can be remotely controlled from an external PC by connecting a USB cable from one to the other.

Accessing the AQ7270
Internal Memory from PC - Type B


You can easily access to internal memory with USB cable from a PC.

Front Panel

Frontpanel S

Top Panel (Shown with optional Printer/Lan installed)

Toppanel S

Side Panel


Built-in Dummy FIber (/DM Option)

Excellent for detecting faults in fiber patch panels!


Fibers in offices frequently involve short distances between connectors. By using the dummy fiber, you can check whether there is any abnormal near-end connection loss. Also, by measuring the connection loss at the near-end connector, you can determine the total fiber loss including that of the connector.

Optical Power Monitor (/PM Option)

Using the power monitor (factory option), you can check optical power for link loss testing or when troubleshooting. Useful for checking the optical power at the ONU's receiver in FTTH. When combined with a stabilized light source, it can also be used as an optical fiber identifier.


Light Source (/LS Option)

The light source (factory option) can be used for optical fiber identification or optica loss testing.


Built-in Printer, LAN (/PL Option)

An optional built-in thermal printer is provided to instantly print out a screenshot of the AQ7270's display, measurement conditions, analysis results, and a event list. LAN function allows easily accessing to internal memory with Ethernet cable from a PC.


Name Description File Type  
Bulletin AQ7270-01E Optical Time Domain Reflectometer AQ7270 pdf icon
1.56 MB
Name Description  
AQ7932 OTDR Emulation Software (Learn More) The AQ7932 OTDR Emulation Software is a powerful tool for analyzing, reporting, and printing OTDR test data, With the AQ7932 software, you can perform analysis on your PC. Learn More
TMCTL TMCTL is a DLL to support development of custom software. By using this DLL, users can write original programs to control instruments from a PC. y-Link
USB Driver The USB Driver is needed when required by the software. y-Link
Yokogawa OTDR Remote Controller The Yokogawa OTDR Remote Controller allows users to control the OTDR from a PC connected via an Ethernet, a WLAN or a USB interface.(*)
You can control the OTDR from a control panel that is displayed on the PC when the Yokogawa OTDR Remote Controller software starts up.
* AQ1000 is enable to connect via a WLAN interface.

All Products Guide
All Products Guide
PDF (26.47 MB)