AQ6370E Telecom Optical Spectrum Analyzer 600 - 1700 nm

The AQ6370E OSA has a versatile wavelength range of 600 nm to 1700 nm, ideal for both telecom and general purpose applications. The unique free-space input design allows testing of both DWDM-class single-mode and VCSEL-sourced multimode fibers in a single model and the high-speed measurement mode, high close-in dynamic range mode, touch panel, and APP function greatly improve measurement efficiency.

  • Wavelength range:600 to 1700 nm
  • Wavelength accuracy:±0.008 nm typ.
  • Wavelength resolution:0.02 nm
  • Close-in Dynamic range:78 dB typ.
  • Level range:+20 to -90 dBm
  • Up to 2x faster measurement: SMSR mode
  • Sharper spectrum measurement: HCDR mode
  • Large touchscreen LCD

World-Class Optical Performance

  • Wavelength range: 600 to 1700nm
  • High wavelength accuracy: ±0.008 nm typ.
  • High wavelength resolution: 0.02nm
  • Wide dynamic range: 78dB typ.
  • Wide level range: +20 to -90dBm
  • Fast measurement: 0.2 sec. (100nm span)
  • Applicable to single-mode and multimode fibers

Standard and High-Performance Models

There are two models available, Standard and High performance. The High performance model provides even higher wavelength accuracy and dynamic range.

High wavelength resolution: 0.02nm

High Wavelength Accuracy: ±0.008 nm typ.

  • High performance model: ±0.008 nm typ. (C band)
  • Standard model: ±0.015 nm typ.(S+C+L band)
Wavelength range Standard (-10) High performance (-20)
1520 to 1580 nm ±0.015 nm ±0.008 nm
1450 to 1520 nm
1580 to 1620 nm
±0.015 nm

Note: The wavelength accuracy values in the table are typical values.

Ultra-High Dynamic Range: 78dB typ.

With the reduced stray-light in the monochromator, AQ6370E achieves ultra-high dynamic range of typ. 78dB.

  Standard (-10) High Performance (-20)
Peak± 1.0 nm
Peak± 0.4 nm
Peak± 0.2 nm
73 dB
62 dB
45 dB
73 dB (Typ.78dB)
64 dB (Typ.70dB)
50 dB (Typ.55dB)
*Resolution setting 0.05 nm

Sharper spectrum measurement: HCDR mode

The HCDR (High Close-in Dynamic Range) mode is a feature for single longitudinal mode laser measurements that makes the spectrum around the peak sharper and the side modes more clearly visualized.
This mode is only available on the High performance model(-20).

Sharper spectrum measurement: HCDR mode

Example of HCDR mode
Resolution setting 0.02 nm, High performance model

Stray-light suppression ratio: 80dB typ.

This new specification provides stray-light suppression capability when High dynamic mode, usually taking longer measurement time, is not used. The AQ6370E contributes to shortening the measurement time with the high stray light suppression ratio.
Standard (-10) High Performance (-20)
73dB 76dB (Typ. 80dB)
*Resolution setting 0.1nm

Stray-light suppression ratio: 80dB typ.

Sensitivity setting: MID
High dynamic mode: ON, typical

Wide Level Range: +20DBm to -90dBm

The AQ6370E can measure high power sources such as optical amplifiers and pump lasers for Raman amplifiers, and very weak optical signals as well. Measurement sensitivity can be chosen from seven categories according to test applications and measurement speed requirements.

  • Improved level sensitivity: -85dBm (1000 to 1300nm)
  • Smoothing Function - Reduce noise on the measured spectrum
  • High dynamic mode - Obtain a better dynamic range by reducing the influence of stray-light, which is caused when the input is a strong optical signal.

Free Space Input

  • AQ6370D 4Multimode and single mode fiber on the same OSA.
  • AQ6370E's low insertion loss for multimode fiber is also beneficial to maintain the excellent measurement efficiency.
  • Small insertion loss variation at the input
  • connector increases measurement repeatability.
  • No damage connecting fibers
  • because there is no physical contact.
  • APC level correction
  • The APC level correction function corrects the level offset caused by an insertion loss of angled PC connector.

Up to 2x faster SMSR measurement: SMSR mode

Up to 2x faster SMSR measurement: SMSR mode The SMSR mode is the sensitivity setting dedicated for measuring the laser’s SMSR faster.
It can measure the SMSR up to twice as fast as the conventional sensitivity mode (TRAD MIDx2).

Note: Fast measurement may not be possible depending on the level of the optical spectrum.

Fast Remote Interface (Ethernet, GP-IB)

Wide Span Sweep yet High Resolution

The 20,001 data sampling points expands measurement range in a single sweep while keeping a high wavelength resolution.
This makes your measurement easier and more efficient than conventional systems.

Large touchscreen LCD

The high-resolution, responsive 10.4-inch multi-touch capacitive touchscreen makes device operation even simpler and more intuitive. You can change measurement conditions, perform analysis, change the optical spectrum view as if you were operating a tablet device. In the optical spectrum view, the waveform view can be zoomed or shifted by a simple tap and drag.

Large touchscreen LCD

USB ports

Four USB ports in total available on front and back facilitate the use of external devices such as a mouse, keyboard, external hard drives, and memory sticks.

USB ports

Thumbnail file preview

The thumbnail allows an easy route to quickly find a particular file out of many files in internal and external storage.

Thumbnail file preview

All-at once trace filing

This time-saving feature allows the user to save all seven traces in one file at once. Files are saved in CSV format and can be easily manipulated with a PC application software.

DUT-oriented test apps (APP) simplifies the test process

Application (APP) mode transforms a versatile OSA into a machine dedicated to a device under test (DUT). APP mode provides a DUT-specific user interface that navigates the user from configuration settings to test result output without the user being aware of the wide variety of OSA settings.

DUT-oriented test apps (APP) simplifies the test process

The AQ6370E comes pre-installed with several basic applications such as WDM testing, DFB-LD testing, and FP-LD testing. In addition, the application can be downloaded from the Yokogawa website and added to the AQ6370E for use.

APP menu window

APP menu window

Gate sampling function

The Gate Sampling function facilitates the recirculating loop testing of optical transmission systems. Using an external gate signal, the AQ6370E obtains the optical spectrum of the signal which is passing through a certain loop. The advantage of this approach is its speed compared with the conventional External Trigger or Sweep Enable function.

Resolution calibration function

The Resolution Calibration function is used to calibrate the noise equivalent bandwidth with an external light source. With this new feature, the measurements of power density of a broad spectrum light source will be more accurate

Various Analysis Functions

7 Indvidual Traces

  • Simultaneous multi-trace display
  • Calculation between traces (subtraction between traces)
  • Max/Min hold

15 Specific Data Analysis Functions
for popular applications, such as:

  • Spectral width analysis
  • WDM (OSNR) analysis
  • WDM-NF (EDFA) analysis
  • DFB-LD analysis
  • FP-LD analysis
  • iTLA analysis
  • LED analysis
  • SMSR analysis
  • Various filter analysis
  • With the macro programming, multiple analyses can be combined and executed automatically.

Building Automated Test System

Macro Programming

AQ6370D 6

  • Build a simple auto-measurement system without an external controller.
  • Easy to create test program by recording the user's actual key strokes and parameter selections.

Fast Remote Interfaces

  • GP-IB and Ethernet (10/100Base-T) interfaces
  • Improve the testing throughput of test systems by the fast measurement, command processing, and data transfer speed.
  • SCPI compatible commands and AQ6317 Emulation Mode
  • LabVIEW® Driver available

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, AQ6370E can maintain its high optical performance within a couple of minutes so that you can quickly start a measurement.

Built-in wavelength reference source

  • AQ6370E comes equipped with a wavelength reference source for the wavelength calibration and optical alignment.

Wavelength calibration function

  • Automatically calibrates with the built-in wavelength reference or an external light source, to ensure the wavelength accuracy.

Optical alignment function

  • Automatically aligns the optical path in the monochromator using the built-in source to maintain high performance.

AQ6370E's overall high performance can cover not only manufacturing of optical devices and optical transmission systems but also research and development, and a variety of other applications.

  • Optical active devices
  • Laser diode/Fiber laser/Optical amplifier/Optical transceiver
  • Optical passive devices
  • Filter/FBG/AWG/WSS/ROADM/Optical fiber
  • Optical transmission equipment (DWDM, CWDM)
  • Development support of Applied photonics equipment
  • LiDAR and 3D Sensing optical sources

LiDAR, Laser Diode free space beam Measurement

The free space beam from device level optical sources for LiDAR, 3D sensing, Wafer Chips, optical transceiver TOSAs and laser diodes (LD) in general may be conveniently coupled to a fiber input using various beam capture solutions to optimize the spectral detection performance of the OSA.

For performing long term testing of extreme temperature effects for automotive LiDAR devices as an example, learn how the Data Logging Function can be utilized to eliminate time consuming program development and validation.

OSNR Measurement on DWDM System

AQ6370E's wide close-in dynamic range allows accurate OSNR measurement of DWDM transmission systems (up to 50 GHz spacing). The built-in WDM analysis function analyzes the measured waveform and shows peak wavelength, peak level and OSNR of WDM signals up to 1024 channels simultaneously.

Optical Amplifier (EDFA) Measurement

AQ6370D 8

The ASE interpolation method is used to measure gain, NF, and key parameters for optical fiber amplifier evaluation. With WDM-NF analysis function, up to 1024 channels of multiplexed signals can simultaneously be tested. An ASE level for NF measurements is calculated by using a curve-fit function for each WDM channel.

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


This application note introduces free space light measurement jigs for measuring the emission spectrum of a light source that propagates in free space or the optical transmission spectrum of an optical filter. It describes four types of jigs for light sources and one type for filters.


Optical transceivers are one of the indispensable key devices for optical communications that interconvert optical and electrical signals.

Notes d'application

OSA Macro Program Function

The OSA Macro Program Function enables automated measurement by creating programs for entry of measurement conditions and other tasks. Users can program a sequence of measurement procedures from entry of measurement conditions (e.g., wavelength sweep width, setting resolution) to analyses, data saving, output, and others and eliminates redundant procedures on the production line. The function acts as a controller of other connected devices through the LAN or RS232C port and allows users to build an automatic measuring system without using an external PC and input measurement conditions or output measured results while programs are running.

Product Overviews


    Introducing the new Yokogawa Test&Measurement AQ6380 Optical Spectrum Analyzer. This new OSA includes many sought-after features including:

    • An unprecedented 5 pm wavelength resolution
    • ±5 pm wavelength accuracy
    • 1200 nm to 1650 nm wavelength range
    • 65 dB wide close-in dynamic range
    • 80 dB stray light suppression
    • Automated wavelength calibration
    • Gas purging
    • DUT-oriented interface and test apps
    • Backward-compatible remote interface
    • 10.4in intuitive touchscreen
    • Up to 20x faster measurement
    • Remote operation capabilities

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