AQ6376 Three Micron Optical Spectrum Analyzer

1500 to 3400 nm, for precisely assessing the properties of 3-µm lasers

Yokogawa AQ6375 Optical Spectrum Analyzer Series

AQ6375 SOptical Spectrum Analyzer— Watch the AQ6375 Video —


  • Long Wavelength Range: from 1500 nm to 3400nm
  • High Sensitivity: down to -65dBm
  • Gas purging ports to reduce water vapor effects
  • Built-In cut filter for high order diffracted light
  • Double Speed Mode to further enhance fast measurement speed
  • High resolution to 0.10 nm
  • Wide close-in dynamic range: 55 dB
  • Fast auto-calibration
  • Free space optical input for maximum flexibility, low maintenance, and high reliability
  • Applicable to single-mode and multimode fibers
  • Excellent performance for environmental gas sensing Laser Spectroscopy
  • Indispensable tool for R&D and manufacturing of optical devices in the wavelength range from telecom band to 3.4μm


  • test & characterize passive optical components like FBGs, Filters, specialty fibers (e.g. Thulium doped)
  • test active opto-electronics devices like semiconductor LASERs and Supercontinuum light sources used in industrial, telecom and medical/biomedical applications and environmental analysis
  • measure gas concentration in the air using Laser Absorption Spectroscopy.
  • Characterization of Fiber Bragg Gratings (FBGs)
  • Characterization of Supercontinuum Light Sources
  • Gas detection by Laser Absorption Spectroscopy


The AQ6376 is the latest version of our bench-top optical spectrum analyzer extending the wavelength coverage well beyond the NIR range of our previous models into the MWIR region from 1500 to 3400 nm.

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The built-in calibration source
Popular applications include the detection of gases such as carbon oxides (COx), nitrogen oxides (NOx), and hydrocarbon gas (CxHy) for environmental studies. Similar to the long wavelength model, it offers the added benefits of gas purging input ports / output ports, a built-in cut filter for high order diffracted light, and a novel double speed mode which increases the sweep speed up to 2 times compared to the standard sweep mode.
  • Literature
  • Specifications
Model: AQ6376 OSA Series
Display: 10.4-inch color LCD
Display Resolution: 800 × 600
General Specifications
Wavelength Range: 1200 to 2400 nm
Span: 0.5 nm to 1200 nm (full span), and 0 nm
Accuracy ±0.05 nm (1520 to 1580 nm), ±0.10 nm (1580 to 1620 nm),
±0.50 nm (Full range)
Linearity: ±0.01 nm (1520 to 1580 nm), ±0.02 nm (1450 to 1520 nm, 1580 to 1620 nm)
repeatability: ±0.015 nm (1 min.)
Resolution Setting: 0.05, 0.1, 0.2, 0.5, 1 and 2 nm
Min. Sampling Res.: 0.002 nm
Number of samplings: 101 to 50001, AUTO
Level Sensitivity Setting: NORM_HOLD, NORM_AUTO, NORMAL, MID, HIGH1, HIGH2 and HIGH3 (Only High dynamic mode (/CHOP) in HIGH1-3)
High Dynamic Mode: SWITCH (Sensitivity: MID, HIGH1-3)
Sensitivity: −70 dBm (1800 to 2200 nm), −67 dBm (1500 to 1800 nm,
2200 to 2400 nm), −62 dBm (1300 to 1500 nm) (Sensitivity: HIGH3)
Max. Input: +20 dBm (per channel, full wavelength range)
Max. Safe Input: +25 dBm (Total input power),
+10 dBm (400 to 550 nm) (Total input power)
Level Accuracy: ±1.0 dB
(1550 nm, input level: −20 dBm, Sensitivity: MID, HIGH1-3)
Linearity: ±0.05 dB (Input level: −30 to +10 dBm, Sensitivity: HIGH1-3)
Dynamic Range
Range: 45 dB (Peak ±0.4 nm, Resolution setting: 0.05 nm) >/br>55 dB (Peak ±0.8 nm, Resolution setting: 0.05 nm, 1523 nm, Sensitivity: HIGH1-3)
Polarization Dependence: ±0.1 dB (1550 nm)
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 , large core size
Others: Trace copy/clear, Write/Fix setting, Display/Blank setting
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. AQ6375B), Filter peak/bottom analysis, WDM filter peak/bottom analysis, DFB-LD/ FP-LD/ LED analysis, SMSR analysis, Power analysis, PMD analysis, Color analysis (AQ6375B 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. AQ6375B) or an external wavelength reference source.
Resolution: Resolution calibration with an external reference source.
Electrical interface: GP-IB , RS232, Ethernet, USB , 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
Purge gas input/output terminals: Outer diameter 1/4 inch nylon tube
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: 20 to 80%RH (no condensation)
Dimensions: 426 (W) × 221 (H) × 459 (D) mm (excluding projector & handle)
(Excluding protector and handle)
Weight: 23 kg
Safety: EN 61010-1