AQ6373 superceded by AQ6373B

300 to 1200 nm, Designed to out-perform in optical measurements taken in VIS (visible) and NIR (near infrared) regions.

Yokogawa AQ6373 Optical Spectrum Analyzer Series


  • 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
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    • 10 wavelength resolution settings: from 10 pm to 10 nm
    • 7 level sensitivity settings: down to -80 dBm
    • Fast measurement: only 0.5 sec for 100 nm span
    • Smoothing function
    • Color Analysis function
    • Special optical free space input
    • 12 built-in analysis functions for popular applications


  • Optical active devices(Laser diode/Fiber laser)
  • Optical passive devices(Filter/FBG/Specialty optical fiber)
  • Development support of Applied photonics equipment
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    • 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


The AQ6373 is one of the latest additions to the AQ6370 Series. With the ability to provide high speed, accurate analysis of the wavelength range between 350 nm and 1200 nm, it is well suited for a broad range of applications. The AQ6373 can accelerate the development and manufacturing of short wavelength lasers, passive devices and LEDs as well as equipment that uses these devices for biomedical, material processing, consumer products and telecommunication applications. With built-in color analysis capabilities and remote command compatibility with the AQ6315, the AQ6373 provides an upgrade of features, speed and optical performance for the old AQ6315 users.

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The built-in calibration source
Ambient temperature change, vibrations and shock affect the measurement accuracy of high precision products like optical spectrum analyzers. We want our OSAs to be able to deliver always the precise measurements they were designed for, therefore our instruments are equipped with a light source for calibration. Calibration process is fully automatic and takes only 2 minutes to complete. It includes:
– The Optical Alignment function, which automatically aligns the optical path in the monochromator to assure the level accuracy;
– The Wavelength Calibration function, which automatically calibrates the spectrum analyzer with the reference source to ensure the wavelength accuracy..
  • Literature
  • Specifications
Model: AQ6373 OSA Series
Display: 10.4-inch color LCD
Display Resolution: 800 × 600
Wavelength Range: 350 to 1200 nm
Span: 0.5 nm to 850 nm (full span), and 0 nm
Accuracy ±0.05 nm (633 nm), ±0.20 nm (400 to 1100 nm) (After wavelength calibration with 633 nm He-Ne laser.)
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: 0.02, 0.05, 0.1, 0.2, 0.5, 1, 2, 5, 10 nm (full range), and 0.01 nm (400 to 470 nm)
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: −80 dBm (500 to 1000 nm),
−60 dBm (400 to 500 nm, 1000 to 1100 nm)
(Typical, Resolution setting: ≥ 0.2 nm, Averaging: 10 times, Sensitivity: HIGH3)
Max. Input: +20 dBm (Per channel, full range)
Max. Safe Input: +20 dBm (550 to 1100 nm),
+10 dBm (400 to 550 nm) (Total input power)
Accuracy: ±1.0 dB (850 nm, Input level: −20 dBm,
Resolution setting: ≥ 0.2 nm, Sensitivity: MID, HIGH1-3, SMF [MFD 5 μm@850 nm, NA0.14])
Linearity: ±0.2 dB (Input level: −40 to 0 dBm, Sensitivity: HIGH1-3)
Dynamic Range
Range: 60 dB (Peak ±0.5 nm, Resolution setting: 0.02 nm, 633 nm, Sensitivity: HIGH1-3)
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 × 2 (standard/controller)
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: 20 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