AQ6370C Optical Spectrum Analyzer (DISCONTINUED)

Notice: This product was discontinued on 14.03.31. See this replacement product:

Improved World-Class Optical Performance

  • Wavelength range: 600 to 1700nm
  • High wavelength accuracy: ±0.01nm
  • 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

Related Products

Offers higher Wavelength Accuracy, but reduced span, and sensitivity compared to the AQ6370C OSA


Click to see details of Latest Firmware Features

Improved World-Class Optical Performance

  • Wavelength range: 600 to 1700nm
  • High wavelength accuracy: ±0.01nm
  • 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: ±0.01nm

  • High performance model: ±0.01nm (C band)
  • Standard model: ±0.02nm (C+L band)
Wavelength Range Standard (-10) High Performance (-20)
1520 to 1580 nm
1580 to 1620 nm
1450 to 1520 nm
Full range
±0.02 nm
±0.02 nm
±0.04 nm
±0.1 nm
±0.01 nm
±0.02 nm

±0.04 nm
±0.1 nm

Ultra-High Dynamic Range: 78dB typ.

With the reduced stray-light in the monochromator, AQ6370C 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


AQ6370C 1 1


Example of the dynamic range
Peak ±1.0nm, Resolution setting 0.05 nm,
High dynamic mode: ON, High performance model

Sharper Filter Edge

The high performance model can also achieve a higher dynamic range within 0.2nm of the peak wavelength. With the sharper spectral characteristics of the monochromator, spectral signals in close proximity can be separated clearly and measured accurately.


  Standard (-10) High Performance (-20)
Peak± 0.2 nm
Peak± 0.1 nm
55 dB
37 dB
58 dB (Typ.60dB)
45 dB (Typ.50dB)
*Resolution setting 0.02 nm

AQ6370C 2

Example of the spectral shape

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 AQ6370C contributes to shortening the measurement time with the high stray light suppression ratio.
Standard (AQ6370C-10) High Performance (AQ6370C-20)
73dB 76dB (Typ. 80dB)
*Resolution setting 0.1nm

AQ6370C 3

Example of the stray-light suppression ratio
High dynamic mode: ON, Resolution setting 0.1 nm, High performance model

Wide Level Range: +20DBm to -90dBm

The AQ6370C 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

  • AQ6370C 4Multimode and single mode fiber on the same OSA.
  • AQ6370C'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.


Excellent Efficiency

Fast Sweep: 0.2sec./100nm

With an advanced monochromator, faster electrical circuits, and noise reduction techniques, the AQ6370C achieves fast measurement speed even when measuring a steep spectrum from DFB-LD or DWDM signals, or when measuring a low power signal from a broadband light source.

Fast Remote Interface (Ethernet, GP-IB)

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 measurement easier and more efficient than conventional systems.

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.


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.

Easy Data Handling

  • AQ6370C 5USB Storage
  • USB interfaces support large-capacity removable memory and hard disk drives.
  • 512MB Internal Memory
  • for over 20,000 traces
  • All-at-Once Trace Filing
  • All seven traces can be saved in one file at once.


Various Analysis Functions

7 Indvidual Traces

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

13 Spectral Analysis Functions
for popular applications, such as:

  • Spectral width analysis
  • WDM (OSNR) analysis
  • WDM-NF (EDFA) analysis
  • DFB-LD analysis
  • FP-LD 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 ProgrammingAQ6370C 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, RS-232, 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, AQ6370C can maintain its high optical performance within a couple of minutes so that you can quickly start a measurement.

  • Built-in wavelength reference source
  • AQ6370C 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.


AQ6370C'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

OSNR Measurement on DWDM System

AQ6370C 7
AQ6370C'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

AQ6370C 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.





NA Conversion Adapter

  • 735383-A001, A002 numerical aperture conversion adapters
  • Half numerical aperture of optical fiber 
  • AQ6370 series optical spectrum analyzers' free-space optical input structure 

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