AQ6373B Visible Wavelength Optical Spectrum Analyzer 350 - 1200 nm (DISCONTINUED)

Notice: This product was discontinued on Nov 20, 2023. See this replacement product:

Yokogawa Optical Spectrum Analyzer

The AQ6373B is one of the latest additions to the AQ6370 Series of Optical Spectrum Analyzers. With the ability to provide high-speed, accurate analysis of the short wavelength range between 350nm and 1200nm, this OSA is well suited for a broad range of applications. The AQ6373B can accelerate the development and manufacturing of short wavelength lasers, passive devices, and LEDs as well as equipment that uses these devices for the biomedical, material processing, consumer product, and telecommunications markets. With built-in color analysis capabilities and remote command compatibility with the AQ6315, the AQ6373B provides an upgrade of capabilities, speed, and performance for current AQ6315 users.

  • Wavelength range: 350 to 1200nm
  • Wavelength accuracy: ±0.05 nm
  • Wavelength resolution: 0.02 to 10 nm and 0.01nm (400 to 470nm)
  • Max safe input power: +20 dBm
  • Level sensitivity: -80 dBm
  • Dynamic range: ≧60dB
  • Single-mode, Multimode, and Large-core fibers
  • Built-in optical alignment source
  • Wavelength calibration with an external reference source
  • Various analysis functions including the Color analysis function for VIS

405 nm FP-LD measurement (resolution setting: 0.01 nm)
Analysis of FP-LD (VCSEL) sources
In 400-470nm range, achieves even higher resolution.


  • Optical active devices(Laser diode/Fiber laser)
  • Optical passive devices(Filter/FBG/Specialty optical fiber)
  • Development support of Applied photonics equipment
  • Medical/Bio: Laser therapy, DNA sequencing, Microscope
  • Industrial: Laser micro-machine, laser maker
  • Home Electronics: Laser projector, Next-gen optical disc, LED products
  • Measurement Sensing: LIDAR, Interferometer
  • Telecom: Plastic Optical fiber (POF) communication

World-class optical performance

High Resolution & High Dynamic Range
The advanced monochromator achieves high wavelength resolution and high close-in dynamic range. With the sharper spectral characteristics of the monochromator, spectral signals in close proximity can be separated clearly and measured accurately.

High Sensitivity
Weak optical signals can be measured accurately and quickly.

7 sensitivity settings
Can be selected according to test applications and measurement speed requirements.

High dynamic mode
Obtains a better dynamic range by reducing the influence of stray-light, which is caused when the input is a strong optical signal.

Pulsed Light Measurement

Peak-Hold and External trigger mode
Measure a pulse peak spectrum of a pulsed light signal. Often used in the transmission loop testing of telecommunication systems, and also in the low power measurement at the early stage of laser chip development to catch the peak power of a pulsed signal.

Free Space Input

■Multimode and single mode fiber on the same OSA

■Small insertion loss variation at the input connector increases measurement repeatability.

■No damage connecting fibers because there is no physical contact.

■Supports SM, GI (50/125 μm, 62.5/125 μm) and large core fiber up to 800 μm.

Optical input structure
Optical input structure
(note. AQ6373B uses a fixed connector)


Excellent efficiency

Fast Sweep
With an advanced monochromator, faster electrical circuits, and noise reduction techniques, the AQ6373B achieves fast measurement speed even when measuring a steep spectrum from DFB-LD signals, or when measuring a low power signal from a broadband light source.

Wide Span Sweep yet High Resolution
The 50,001 data sampling points expands measurement range in a single sweep while keeping a high wavelength resolution. This makes your measurements easier and more efficient than conventional systems that use a low number of sampling points and require multiple partial measurements to cover the complete wavelength range.

Easy to Keep Accurate

Ambient condition change, vibration and shock to an optical precision product, like an optical spectrum analyzer, will effect the optical components and eventually degrade optical performance.
Using standard functions, the AQ6373B can maintain its high optical performance within a couple of minutes so that you can quickly start a measurement.

Optical alignment function
 Automatically aligns the optical path in the monochromator using the built-in source to maintain high performance.
Wavelength calibration function
 Automatically calibrates the spectrum analyzer with an external light source, to ensure the wavelength accuracy.

Built-in optical alignment source
Note. GI 50/125µm fiber is required.
An external light source is required for the wavelength calibration.

Note. There are cases that the optical alignment and wavelength calibration function cannot correct optical performance.
Periodical calibration is also required.

Graphic Analyzer New Functions

Data Logging function
Records analysis results such as distributed feedback laser diode (DFB-LD) analysis and multi-peak measurements at up to 10,000 points per channel with time stamps. This function is useful for the long-term stability testing and temperature cycle testing of systems and devices.

Advanced Marker function
Adds markers to obtain the power density and the integrated power of a designated spectrum.

USB ports

  • Mouse
  • Keyboard
  • Memory
  • HDD

Easy Operation

Trace zooming
■Change display conditions, such as center wavelength and span, by clicking and dragging the mouse.
■Enlarge your area of interest instantly and move it at will.
■No need for another measurement to modify the display conditions.

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Mouse & Keyboard operation
■Front panel operation proven intuitive and easy to use by our many of users.
■Even easier with a mouse.
■The keyboard helps enter labels and file names.

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Easy Data handling

■USB storage
-USB 1.1 compatible interfaces support large size removable memory devices such as Flash ROM and hard disk drives (HDD).
- Easy way to carry a large number of data files.

■512MB Internal storage
- Save over 20,000 data files

File types and formats:
- Trace: Binary and ASCII (CSV)
- Graphic: Bitmap (BMP) and TIFF
- Analysis results: Binary and ASCII (CSV)
- Template: ASCII (CSV)
- System setup: Binary
- Macro program: Binary

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Thumbnail File Preview
Easy to find a particular file out of thousands of files in internal and external storage.

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Various Analysis Functions

Spectrum analysis functions
12 data analysis functions for popular applications

■Built-in analysis functions:
- Spectral width analysis
- OSNR analysis
- DFB-LD analysis
- FP-LD analysis
- LED analysis
- SMSR analysis
- Optical power analysis
- Various filter analysis
- Color analysis

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7 individual traces

■Calculation between traces (subtraction between traces

■Max/Min hold

■Simultaneous multi-trace display

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Building Automated Test System

Macro programming

Build a simple auto-measurement system

■No external PC is required.

■Easy to create test program by recording the user’s actual key strokes and parameter selections.

■Can control external equipment through the remote interfaces.

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Fast remote interfaces

■GP-IB, RS-232, and Ethernet (10/100Base-T) interfaces
 Easy to control with an external PC and to build an automated test system.

■Improve the testing throughput of test systems
by the fast measurement, command processing, and data transfer speed.

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SCPI compatible
The standard remote commands are compatible with SCPI, which is an ASCII text based standard code and format that conforms to IEEE-488.2.

AQ6317 Emulation mode
Supports the private remote commands of Yokogawa's best selling AQ6317 series and AQ6315 for users to easily upgrade from their current automated test environment.
Note. some commands may not be compatible due to changes in specifications and functions.

LabVIEW® driver available

■Visible LED Test
The optical spectrum of visible LEDs used in lighting, indication, measurement and applications can be measured and analyzed.

By supporting the large core fiber input, the AQ6373B can efficiently get the LED light and measure its spectrum. The built-in color analysis function automatically evaluates a dominant wavelength and chromatic coordinates.

Visible LED Test

Analysis of FP-LD (VCSEL) sources
Today FP-LD sources emitting in the visible (VIS) wavelength range are mounted into many different devices/systems used in different areas of application, such as:

  • Industrial: Barcode scanners, LiDAR surface scanners;
  • Consumer electronics: audio output of Hi-Fi audio systems,laser printers, computer mice;
  • Automotive/home networking: with Plastic Optical Fibers cabling.

405 nm FP-LD measurement (resolution setting: 0.01 nm)
VCSEL seen through a Scanning Electron Microscope

AQ9447 Connector Adapter

  • AQ9447 Connector Adapters
  • For optical input port
  • AQ6370 Series Optical Spectrum Analyzer Accessories

AQ9441 Connector Adapter

Suffix Descriptions
-FC FC type
-SC SC type

Numerical Aperture Conversion Fiber

By connecting a GI 50 or GI 62.5 optical fiber with a relatively large NA to the NA Conversion Fiber, the NA Conversion Fiber reduces the loss that occurs at the input and improves the measurement dynamic range during passive device measurements and the stability of optical level measurements during active device measurements.

751535-E5 Rack mounting kit

RACK MOUNTING KIT For an EIA-compliant Single-housing Rack

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