AQ6370D Telecom Optical Spectrum Analyzer

600 to 1700 nm, ideal for the characterization and test of optical components and systems used in the tele-communications Industry.

Yokogawa AQ6370D Telecom Optical Spectrum Analyzer Series


  • Wavelength range: 600 to 1700nm
  • built-in calibration source
  • 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 multi-mode fibers
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    • Wide measurement power range (up to 110 dB)
    • 7 wavelength resolution settings: from 20 pm to 2 nm
    • 7 level sensitivity settings: down to -90 dBm
    • High close-in dynamic range: 78 dB typ.
    • Double Speed mode
    • Fast measurement: only 0.2 sec for 100 nm span
    • Up to 16 specific data analysis functions
    • Macro Programming


  • WDM OSNR test
  • Optical amplifier test
  • Passive component test, In conjunction with a broadband light source such as ASE, SLD, SC light source
  • Optical transceiver test, In conjunction with bit error rate test (BERT) equipment
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    • Visible LED test
    • Analysis of FP-LD (VCSEL) sources
    • Characterization of sources used in laser Absorption Spectroscopy
    • Characterization of Fiber Bragg Gratings


The Yokogawa AQ6370D Series of benchtop Optical Spectrum Analyzers (OSA) offers test & measurement advanced functionalities to a wide range of R&D and industrial manufacturing applications. The AQ6370D is the ideal model for the characterization and test of optical components and systems used in the telecommunications Industry. With the highest resolution (up to 20 pm) & highest close-in dynamic range (up to 78 dB), the AQ6370D’s advanced monochromator enables the detection of spectral signals which are in close proximity to be distinguished and accurately measured.
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Low-power optical signals can be measured accurately and quickly, without any need to use averaging over many measurements. Moreover, with the High Dynamic Mode enabled, the instrument will maximize its dynamic range performance by eliminating the influence of stray-light, a disturbing factor for the photo-detector caused by strong input signal which increases the noise floor . And with The widest measurement power range (up to 110 dB), The high quality photo-detector and the smart design of the gain circuitry enable the AQ6370 Series to have an incredibly wide measurement power range. The OSA can analyze very strong signals without being damaged and very weak signals as well with great accuracy.
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Automatic Setting of Measurement Conditions – Full Auto Mode

Simply select the measured wavelength and the AQ7275 takes care of the rest by automatically setting the optimal measurement conditions and by performing measurement and event analysis, and fully automated data saving.

Automatic Setting of Measurement Conditions – Wizard Mode

Display the guidelines for the setup items from the Setup menu. Follow the step-by-step instructions to complete the setup.

Automatic Setting of Measurement Conditions – Detail Mode

This mode allows you to set all the detailed settings, not only the measurement and analysis settings but also the screen display and system settings.

Macro’s with Predefined Procedures – One Button Mode

Simply select previously set measurement procedures and then push a button. You can execute up to 5 previously set and saved measurement procedures automatically. Measurement and analysis conditions can be loaded from a file, making it easy to set up measurement procedures previously executed.

Measurement with Auto Wavelength Switching press a button – Multi-Wavelength Measurement

Simply select previously set measurement procedures and then push a button. You can execute up to 5 previously set and saved measurement procedures automatically. Measurement and analysis conditions can be loaded from a file, making it easy to set up measurement procedures previously executed.

Plug Check Function–Checking the connection with the OTDR

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

Detecting Abnormal Events –Fault Event Display Function

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.

Measurement with Comparison to Reference Waveform –Trace Fix Function

This function enables you to freeze the display of one waveform and overlap it on real-time or averaged waveforms. This is useful for creating 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 for use as a reference waveform.

Smart File Function

Because the AQ7275 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 screenshots as BMP, JPG, or PNG files. TRB or TRD files saved on Yokogawa’s previous AQ7250 and AQ7260 models can also be loaded.

USB Function

This function is useful because it can be used for external memory, printing, and communications. The AQ7275 comes standard with two USB1.1 compliant connector ports (types A and B).

Type A

Saving Files to USB Memory | Printing on an External Printer

Type B

Remote Control | Accessing the Internal Memory
  • Literature
  • Specifications
Model: AQ6370D OSA Series
Display: 10.4-inch color LCD
Display Resolution: 800 × 600
Models Standard High performance
Wavelength Range: 600 to 1700 nm
Span: 0.5 nm to 1100 nm (full span), and 0 nm
Accuracy ±0.02 nm (1520 to 1580 nm)
±0.02 nm (1580 to 1620 nm)
±0.04 nm (1450 to 1520 nm)
±0.10 nm (Full range)
±0.01 nm (1520 to 1580 nm)
±0.02 nm (1580 to 1620 nm)
±0.04 nm (1450 to 1520 nm)
±0.10 nm (Full range
Linearity: ±0.01 nm (1520 to 1580 nm), ±0.02 nm (1450 to 1520 nm, 1580 to 1620 nm)
repeatability: 0.02, 0.05, 0.1, 0.2, 0.5, 1 and 2 nm
Resolution Setting: ±5% (1450 to 1620 nm, Resolution setting: ≥ 0.1 nm, after performing the Resolution Calibration function, at the wavelength of resolution calibration
After all the channels finish N samples at the same time, N can be 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096 or 8192.
Min. Sampling Res.: 0.001 nm
Level Sensitivity Setting: NORM_HOLD, NORM_AUTO, NORMAL, MID, HIGH1, HIGH2 and HIGH3
High Dynamic Mode: SWITCH (Sensitivity: MID, HIGH1-3)
Sensitivity: −90 dBm (1300 to 1620 nm), −85 dBm (1000 to 1300 nm), −60 dBm (600 to 1000 nm) (Sensitivity: HIGH3)
Max. Input: +20 dBm (Per channel, full range)
Max. Safe Input: +25 dBm (Total input power)
Accuracy: ±0.4 dB (1310/1550 nm, Input level: −20 dBm, Sensitivity: MID, HIGH1-3)
Linearity: ±0.05 dB (Input level: −50 to +10 dBm, Sensitivity: HIGH1-3)
Flatness: ±0.1 dB (1520 to 1580 nm), ±0.2 dB (1450 to 1520 nm, 1580 to 1620 nm)
Dynamic Range
Resolution: 0.02 nm: 55 dB (Peak ±0.2 nm)
37 dB (Peak ±0.1 nm)
58 dB (Peak ±0.2 nm, Typ. 60 dB)
45 dB (Peak ±0.1 nm, Typ. 50 dB)
Resolution: 0.05 nm: 73 dB (Peak ±1.0 nm)
62 dB (Peak ±0.4 nm)
45 dB (Peak ±0.2 nm)
73 dB (Peak ±1.0 nm, Typ. 78 dB)
64 dB (Peak ±0.4 nm, Typ. 70 dB)
50 dB (Peak ±0.2 nm, Typ. 55 dB)
Resolution: 0.1 nm: 57 dB (Peak ±0.4 nm)
40 dB (Peak ±0.2 nm)
60 dB (Peak ±0.4 nm, Typ. 67 dB)
45 dB (Peak ±0.2 nm, Typ. 50 dB)
Measurement: CW light, Pulsed light, External trigger, Gate sampling*, Air/vacuum wavelength
Sweep Mode: Repeat, Single, AUTO (Self-configuration), Sweep between line markers, Zero span sweep (0 nm span), Data logging
Condition Settings: Center wavelength, Span, Number of sampling, Wavelength resolution, Sensitivity, High dynamic mode, Number of averaging (1 to 999 times), Double speed mode*, Smoothing (excl. AQ6375), APC level correction
Others: Sweep status output, Analog output
Vertical Scale: Level scale (0.1 to 10 dB/div. and linear), Level subscale (0.1 to 10 dB/div. and linear), Reference level, Divisions (8, 10 or 12), power spectral density (dB/nm), dB/km, %, Noise mask
Horizontal Scale: Wavelength (nm), Frequency (THz), Wave number (cm-1), Trace zoom in/out
Display Mode: Normal display, Split display, Data table, Label, Template, Measurement conditions
Functions: 7 independent traces, Maximum/Minimum hold, Calculation between traces, Normalizing, Curve fit, Peak curve fit, Marker curve fit, Roll averaging (2 to 100 times)
Others: Trace copy/clear, Write/Fix setting, Display/Blank setting
Data Analysis
Functions: Spectral width (threshold, envelope, RMS, peak-RMS, notch), WDM (OSNR) analysis, EDFA-NF analysis (excl. AQ6373), Filter peak/bottom analysis, WDM filter peak/bottom analysis, DFB-LD/ FP-LD/ LED analysis, SMSR analysis, Power analysis, PMD analysis, Color analysis (AQ6373 only), Pass/Fail analysis with template
Others: Auto-analysis (ON/OFF), Analysis between horizontal line markers, Analysis in zoomed area
Automated Measurement
Program Function: 64 programs, 200 steps per program
Others: Auto-analysis (ON/OFF), Analysis between horizontal line markers, Analysis in zoomed area
Other Functions
Optical Alignment: Auto-optical alignment with built-in light source or an external reference source.
Wavelength Calibration: Auto-wavelength calibration with built-in wavelength reference source (excl. AQ6373) or an external wavelength reference source.
Resolution: Resolution calibration with an external reference source.
Electrical interface: GP-IB x 1 (standard), RS-232, Ethernet, USB, PS/2 (keyboard)***, SVGA output, Analog output port, Trigger input port, Trigger output port
Remote control: GP-IB, RS-232, Ethernet (TCP/IP)
Data storage: Internal storage: 512 MBytes,
Internal memory: 64 Traces, 64 programs, 3 template lines,
External storage: USB storage (memory/HDD), FAT32 format
File types: CSV (text), Binary, BMP, TIFF
Power Requirements: 100 to 240 V AC, 50/60 Hz, approx. 100 VA
Power: Maximum 150W
Temperature Range: Performance guarantee temperature: +18 to +28°C
Operating temperature: +5 to +35°C
Storage temperature: −10 to +50°C
Humidity Range: Humidity: ≤ 80%RH (no condensation)
Dimensions: 426 (W) × 221 (H) × 459 (D) mm
(Excluding protector and handle)
Weight: 19 kg, Without printer option
Safety: UL 61010-1:2004 ; CAN/CSA-C22.2 NO. 61010-1-2004 ; EN 61010-1:2001 ; IEC 61010-1:2001