AQ6375 – superseded by AQ6375B

1200 to 2400 nm, detection and precise characterization of signals emitted in the exNIR (extended Near InfraRed) and SWIR (Short-Wavelength InfraRed) regions

Yokogawa AQ6375 Optical Spectrum Analyzer Series

AQ6375 SOptical Spectrum Analyzer— Watch the AQ6375 Video —


  • Long Wavelength Range: from 1200nm to 2400nm
  • High Sensitivity: down to -70dBm
  • 6 wavelength resolution settings: from 50 pm to 2 nm
  • 7 level sensitivity settings: down to -70 dBm
  • Wide measurable level range: from -70 dBm to +20 dBm
  • Wavelength accuracy: ± 0.05 nm
  • Close-in dynamic range: 55 dB
  • Built-in optical alignment source
  • Fast measurement: only 0.5 sec for 100 nm span
  • Horizontal scale also in Wave Number (cm-1)


  • Characterization of sources used in laser Absorption Spectroscopy
  • Gas detection and concentration measurements
  • Characterization of Fiber Bragg Gratings
  • Characterization of Supercontinuum light sources


The AQ6375 is the first bench-top optical spectrum analyzer covering the long wavelengths over 2 μm. It is designed for researchers and engineers who have been struggling with inadequate test equipment to measure in these long wavelength ranges. The AQ6375 achieves high speed measurements with high accuracy, resolution and sensitivity, even while providing full analysis features. Troublesome calibration steps and the development of external analysis software is no longer required.

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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: AQ6375 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.: 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: +25 dBm (Total input power)
Max. Safe Input: +20 dBm (550 to 1100 nm),
+10 dBm (400 to 550 nm) (Total input power)
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: 60 dB (Peak ±0.5 nm, Resolution setting: 0.02 nm, 633 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 (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. AQ6375), Filter peak/bottom analysis, WDM filter peak/bottom analysis, DFB-LD/ FP-LD/ LED analysis, SMSR analysis, Power analysis, PMD analysis, Color analysis (AQ6375 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. AQ6375) 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