Yokogawa AQ6370 Fiber Optical Spectrum Analyzer

High-precision ultra-DWDM signal analysis

Yokogawa AQ6370 Optical Spectrum Analyzer


  • World Class Optical Performance & Flexibility
    • High wavelength resolution: 0.02 nm
    • Wide close-in dynamic range
    • Multimode fiber test capability (up to GI 62.5/125μm)
    • Pulsed light measurement capability
  • Improves Measurement Throughput
    • Fast measurement
    • Fast data transfer and storage
  • Expedites Development of Automated Test Systems
    • Supports GP-IB, RS-232C, and Ethernet interfaces
    • Compatible with SCPI and supports AQ6317 series remote commands
    • Built-in simple macro programming function
  • User Friendly
    • Supports mouse and keyboard operation (USB & PS/2)
    • Trace zoom capability
  • Facilitates Frequent Data Handling
    • Large internal user memory (5000+ traces)
    • Supports USB 1.1 compatible large external storage devices
  • Includes Wavelength Calibration Source


  • Simple EDFA test
  • Automated EDFA test
  • Transreceiver / LD test
  • WDM OSNR test
  • Passive component test

Product Description:


The AQ6370 is a bench-top high performance optical spectrum analyzer covering 600 to 1700 nm wavelength range. It is user friendly and improves measurement throughput. A USB interface adds strength in operability and data handling, expediting development of automated test systems.

.The AQ6370 is equipped with GP-IB, RS-232C, and Ethernet (10/100BASE)
interfaces to be connected with an external PC for remote access and building
an automated test system. It is compatible with a standardized programming
language and supports AQ6317 commands for easy programming. Macro Program
is a useful built-in function for making a simple auto test program.


The AQ6317 series is Yokogawa’s best-selling optical spectrum analyzer.
Since there are so many existing users all over the world, the
AQ6370 supports private remote programming codes and formats
of the AQ6317 series to make it easier for users to upgrade their
current test environment.
Note. some commands may not be compatible due to changes in specifications and functions.


Macro programming enables user to easily create test procedures
by recording the user’s actual key strokes and parameter selections.
One program can contain up to two hundred program lines, and
programs can be called as subroutines to make the main program
simple. Moreover, macro programs can control external equipment
through Ethernet, RS-232C and GP-IB port (GP-IB2). Therefore, an
external PC is not required to build a simple auto test system.


The SCPI is an ASCII text based standard code and format that
conforms to IEEE-488.2. The standard remote commands of the
AQ6370 are compatible with SCPI. It can be used with most computer
test languages and test application software.


General Information:

|||||||| Click here for Measurement Throughput

Fast Measurement
New High Sensitivity Mode
Through newly developed noise reduction techniques,
the AQ6370 can complete a measurement faster even
with a high sensitivity setting. This is imperative when
measuring weak signals. A new sensitivity mode makes
it up to five times faster*.
Seamless Sweep
With an improved gain control system in the electrical
amplifier circuit, sweep speed has been increased for
the signals which require multiple amplifier gain settings
to complete an entire trace. The new system
achieves up to ten times faster sweep*.
Quick Key Response
Applying a faster microprocessor and new algorithms,
key response time and initial hardware setup time before
a sweep is drastically reduced. The new system
achieves up to one hundred times faster response*.
Fast Data Transfer and Storage
ETHERNET provides up to one hundred times
faster data transfer speed than the GP-IB data transfer*.
GP-IB provides up to ten times faster data transfer
speed than the conventional GP-IB*.
USB provides up to ten times faster data recording/
retrieving speed to a removable memory device than
the floppy disk*
Satisfaction with Single Measurement
With the increased number of data sampling points
(max 50,001), the AQ6370 can measure a wider wavelength
range (span) with higher resolution. Single
sweep can complete the test that took three sweeps
in the past*.
*In comparison with AQ6317 series optical spectrum analyzer

|||||||| Click here for Tests Available

Simple EDFA Test
The ASE interpolation method is used to measure gain, NF, and
key parameters for optical fiber amplifier evaluation. With WDMNF
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.
The curve-fit and source spontaneous emission (SSE) suppress
function enhance a measurement accuracy.
Automated EDFA Test
In conjunction with DFB-LDs, optical attenuator and optical
switches, an EDFA auto test system can easily be established.
This system does not require manual reconfiguration of optical
paths and adjustments of EDFA input power, and that improves
measurement throughput and avoids a human error. AQ2200 series
is a modular system suitable for building such a system.
Transreceiver /LD Test
In conjunction with bit error rate test (BERT) equipment, the
AQ6370 can measure the center wavelength and spectral width
of transceivers and LD modules. Various built-in analysis functions,
such as DFB-LD, FP-LD (VCSEL), and LED facilitate test
AQ6370’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. The curve fit
function is used to accurately measure noise levels.
Passive Component Test
Wide dynamic range measurement using a synchronous wavelength
sweep function* of a tunable laser source and optical spectrum
analyzer is suitable for evaluating passive devices and components
with a high crosstalk ratio. The tunable laser source emits
a single wavelength, and the AQ6370’s filter characteristics cuts
source spontaneous emission and scattered light. Thus, this system
can achieve wide dynamic range over 70 dB.In conjunction with a white light source, an ASE light source or
other broadband light source, you can simply perform evaluation
of passive devices such as WDM filters and FBG. The AQ6370’s
superb optical characteristics enable higher-resolution and wider
dynamic range measurements.The built-in optical filter analysis function simultaneously reports
peak/bottom wavelength, level, crosstalk, and ripple width.
* TLS SYNC function. It supports AQ4320, AQ4321 and AQ2200-136 Tunable Laser Source.

|||||||| Click here for Features

Excellent Signal Separation
Display The AQ6370 uses a double-pass monochromator structure to
achieve high wavelength resolution (0.02 nm) and wide close-in
dynamic range (70 dB). Thus, closely allocated signals and noise
can be separately measured. OSNR measurement of 50 GHz
spacing DWDM transmission systems and EDFA evaluation with
multiple wavelength sources can successfully be performed.
Wide Measurement Range
Display5 Power: +20 dBm to -90 dBm 

The AQ6370 can measure optical power as high as +20 dBm,
which enables direct measurement of high power sources such
as optical amplifiers and pump lasers for Raman amplifiers. Measurement
sensitivity can be chosen from seven categories according
to test applications and measurement speed requirements.Wavelength: 600 nm to 1700 nm

The AQ6370 covers not only telecommunication wavelengths, but
also the visible light wavelength region which is used for home
electronics, medical, and industrial material applications.

Multimode Fiber Test Capability
Display2 The AQ6370 uses a free space input structure that can handle up
to GI 62.5/125 multimode fiber. Multimode fiber is commonly used
in high speed Ethernet network, such as GE-PON.The free space input is also beneficial for measurement repeatability
as insertion loss variation at the input connector is smaller
than the other input type which has an optical fiber inside the
Pulsed Light Measurement Capability
The AQ6370 can catch the peak power of a pulsed signal using
PEAK HOLD or using an externally provided trigger to synchronize
with the measured signal. It can be applied to the transmission
loop testing of telecommunication systems, and also to the
low power measurement at the early stage of laser chip development
since it works in the high sensitivity modes.
AQ7932 OTDR Emulation software (option)
AQ6370Viewer is PC application software designed to work with
Yokogawa’s AQ6370 Optical Spectrum Analyzer. It has exactly the
same user interface and functions as the AQ6370 so that you can
easily display and analyze waveform data acquired by the AQ6370.Remote control function

The remote control allows you to control AQ6370 Optical Spectrum
Analyzer from anywhere on the Ethernet network. This gives
you the sensation of setting measurement conditions and analysis
parameters, and executing measurement on an actual unit.
Because of fast data transfer speed of Ethernet, measurement
data can be updated in real time. It is useful for diagnosis of trouble
in production lines, periodical observation of long term tests in the
lab, and other applications.

|||||||| Click here for Functions

Pass/Fail Auto Test Function
The waveform can automatically be judged to PASS or FAIL against
specified conditions. Using Template function upper and/or lower
limits for the assessment can be set and measured waveform can
automatically be compared. It is an effective way to reduce time
and human error in assessment, especially for production line tests.
The template data can be created and stored in the AQ6370. It can
be edited using a spread sheet on an external computer as well.
13 Auto Anaysis Functions
Display7 Thirteen types of built-in analysis
functions for popular applications
can be selected by using Analysis
function key on front panel or
by mouse operation.
The functions automatically perform
designated analyses and
provide results. The results can be
saved in a storage device.• WDM analysis (OSNR)

• WDM-NF analysis (EDFA)

• DFB-LD analysis

• Filter analysis, etc.

7 Traces & Calculation Functions
The AQ6370 has seven individual traces for measurement data.
Some traces can be used for calculations (two-trace subtraction
and addition), MAX/MIN hold, averaging, and curve fitting.
Enhanced Curve Fit Function
The Curve fit function is an approximation technique to exclude
an influence of noise and/or signal overlapping on the waveform.
Curve fit method can be chosen from Gaussian, Lorenz, 3rd Poly,
4th Poly, and 5th Poly. Curve fit can be applied to an individual
trace. Fitting area can be set by line markers (L1 and L2).
Analysis Mode
Display9 When WDM or WDM-NF analysis is executed,
one of the curve fit methods is
used for a baseline measurement. The
curve fit method can be specified in the
parameter window of each analysis.
Curve Fitting in Selected Areas
Display10 Noise level of amplified WDM signal can
be estimated by using the curve fit in
selected areas, even if noise between
signals cannot be seen due to a limit of
signal separation performance.
Marker Fitting
Display11 The fitting curve can also be applied
to the marker positions set by user. For
example, this can be used to measure
a modulated signal spectrum.

|||||||| Click here for Detailed Specifications

Applicable fiber SM (9.5/125 μm),GI (50/125 μm, 62.5/125 μm)
Measurement wavelengthrange 1) 600 to 1700 nm
Span 1) 0.5 nm to full range and zero span
Wavelength accuracy 1), 2), 3) ±0.02 nm (1520 – 1580 nm)±0.04 nm (1450 – 1520 nm, 1580 – 1620 nm)

±0.1 nm (Full range)

Wavelength linearity 1), 2), 3) ±0.01 nm (1520 – 1580 nm)±0.02 nm (1450 – 1520 nm, 1580 – 1620 nm)
Wavelength repeatability 1), 2) ±0.005 nm (1 min.)
Measurement data point 101 to 50001
Wavelength resolutionsetting 1), 2) 0.02, 0.05, 0.1, 0.2, 0.5, 1.0 and 2.0 nm
Resolution accuracy 1), 2), 3) ±5 % (1450 to 1620 nm, resolution setting: 0.1
to 2.0 nm,resolution correction: ON,measurement data point setting: AUTO)
Level sensitivity setting NORM_HOLD, NORM_AUTO, NORMAL,MID, HIGH1, HIGH2 and HIGH3
High dynamic range model Switch (Sensitivity: MID, HIGH1, HIGH2 andHIGH3)

CHOP (Sensitivity: HIGH1, HIGH2 and

Level sensitivity 2), 4), 5), 7) -90 dBm (1300 – 1620 nm,resolution:
nm or wider

sensitivity: HIGH3)-80 dBm (1000 – 1300 nm,

nm or wider,

sensitivity: HIGH3)

-60 dBm (600 – 1000 nm

0.05 nm
or wider

sensitivity: HIGH3)

Level accuracy 2), 4), 5), 6) ±0.4 dB (1310/1550 nm, input level: -20 dBm,
sensitivity: MID, HIGH1, HIGH2 and HIGH3)
Level linearity 2), 4) ±0.05 dB (Input level: -50 to +10 dBm,sensitivity: HIGH1, HIGH2 and HIGH3)
Level flatness 2), 4), 6) ±0.1 dB (1520 to 1580 nm)±0.2 dB (1450 to 1520 nm, 1580 – 1620 nm)
Maximum input power 2), 4) +20 dBm (Per channel, full span)
Safe max. input power 2), 4) +25 dBm (Total safe power)
Close-in dynamicrange 1,) 2), 9) 45 dB (±0.2 nm from peak at 1523 nm,resolution: 0.05 nm)

62 dB (±0.4 nm from peak at 1523 nm,

resolution: 0.05 nm)

40 dB (±0.2 nm from peak at 1523 nm,

resolution: 0.1 nm)

57 dB (±0.4 nm from peak at 1523 nm,

resolution: 0.1 nm)

Polarizationdependency 2), 4), 6) ±0.05 dB (1550/1600 nm)±0.08 dB (1310 nm)
Sweep time 1), 7), 8) Per sensitivity mode;NORM_AUTO: 0.5sec

NORMAL: 1 sec

MID: 2 sec

HIGH1: 5 sec

HIGH2: 20 sec

HIGH3: 75 sec

  1. Horizontal scale: wavelength display mode
  2. At 23±5 °C, with 10/125 μm single mode fiber, after 2 hours of warm-up, after optical alignment with
    built-in reference light source
  3. After wavelength calibration with built-in reference light source
  4. Vertical scale: absolute power display mode, resolution setting: 0.05 nm or wider, resolution correction:
  5. With 10/125 μm single mode fiber (B1.1 type defined on IEC60793-2, PC polished, mode field diameter: 9.5 μm, NA: 0.104 to 0.107)
  6. Temperature condition changes to 23±3 °C
  7. High dynamic range mode: OFF, pulse light measurement mode: OFF, TLS sync sweep: OFF, resolution
    correction: OFF
  8. Span: any 100 nm or less, measurement data point: 1001, average number: 1
  9. High dynamic range mode: CHOP or SWITCH, resolution correction: OFF
  10. Excluding feet and handles
  11. Liquid crystal display may include few defective pixels (within 0.002% with respect to the total number
    of pixels including RGB).
    There may be few pixels on the liquid crystal display that do not emit all the time or remains ON all the
    time. Note that these are not malfunctions


Specifications cnt’d
Macro program function (64 programs, 200 steps)
Setting ofmeasuring conditions Center wavelength setting, Span setting, Measurement
data point setting, Wavelength resolution setting, Sensitivity
setting, High dynamic range mode setting, Averaging
number setting (1 to 999 times), Automatic measuring
conditions setting, Sweep between line markers, zero span
sweep, Automatic measurement data point setting, Pulse
light measurement, External trigger measurement, Sweep
trigger, Sweep status output, Analog output, TLS
synchronized sweep, Air/vacuum wavelength
measurement, Pass/Fail judgment with template
Display Level scale setting (0.1 to 10 dB/div. and linear), Vertical
sub scale setting (0.1 to 10 dB/div. and linear), Reference
level and position setting, Vertical division number setting
(8, 10 or 12), Frequency horizontal scale display,
Horizontal scale zoom in/out display, Measurement
condition display, Noise mask, Data table, Label, Split
display, % display, dB/nm (power spectral density)
display, dB/km display, Template display,
Traces 7 independent traces, Write/Fix setting, Display/Blank
setting, Max./Min. hold, calculation between traces, Roll
(Sweep) averaging (2 to 100 times), Normalized, Curve
fit/Peak curve fit/Marker curve fit, Trace copy function,
Trace clear function
Marker/Search Delta marker (Max. 1024), Vertical/Horizontal line marker,
Peak search, Next peak search, Bottom search, Next
bottom search, Auto search, Search between horizontal
line markers, Search in the zooming area
Analysis Spectral width (threshold, envelope, RMS, Peak RMS,
notch), WDM (OSNR) analysis, EDFA-NF analysis, Filter
peak/bottom analysis, WDM filter peak/bottom analysis,
DFB-LD analysis, FP-LD analysis, LED analysis, SMSR
analysis, Power analysis, PMD analysis, Pass/Fail
judgment with template, Auto analysis, Analysis between
horizontal line markers, Analysis in the zooming area
Other Self optical alignment function with built-in light source,
Self wavelength calibration function
Internal memory 64 Traces, 64 programs, 3 template lines
Internal storage Max. 128MByte
External USB storage (memory/HDD) Capability, FAT32
File type CSV(text)/Binary, BMP/TIFF
Remote control GPIB, RS-232C and Ethernet (TCP/IP)AQ6317 series compliant commands (IEEE488.1) and
IEEE488.2 full support
Category GPIB x2 (standard/controller), RS-232C, Ethernet,
USB1.1 x2, PS/2 (keyboard), SVGA output, Analog
output port, Trigger input port, Trigger output port
Optical connector Free space optical input: Requires AQ9447 (*) connector
adapterPC contact built-in light source output: Requires AQ9441
(*) Universal adapter
Printer Built-in high-speed thermal printer (Factory option)
Display 1) 10.4-inch color LCD (Resolution: 800 x 600)
Power requirement 100 to 240 VAC, 50/60Hz, approx. 150VA
Environmental conditions Operating temperature: +5 to +35 °CStorage temperature: -10 to +50 °C
Dimensions and mass 2) Humidity: 80 %RH or less (no condensation)Approx. 426 (W) x 221 (H) x 459 (D) mm, Approx. 27kg
(without printer option)
  1. Liquid crystal display may include few defective pixels (within 0.002% with respect to the total number
    of pixels including RGB).
    There may be few pixels on the liquid crystal display that do not emit all the time or remains ON all the
    time. Note that these are not malfunctions
  2. Excluding feet and handles

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