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Yokogawa AQ6370D

Product Overview:
The Yokogawa AQ6370D is a benchtop optical spectrum analyzer covering the long-wavelength range from 1200 nm to 2400 nm. It is designed for characterization of optical components, fibers, and systems operating in the O, E, S, C, L, and U bands. The “D” suffix denotes the latest revision with enhanced performance and user interface.

Detailed content

Technical Specifications:

  • Wavelength Range: 1200 nm to 2400 nm (extended range)
  • Wavelength Resolution: 0.02 nm, 0.05 nm, 0.1 nm, 0.2 nm, 0.5 nm, 1 nm, 2 nm, 5 nm (selectable)
  • Dynamic Range: 70 dB (typical at 0.05 nm resolution)
  • Sensitivity: -70 dBm (typical at 1550 nm, 0.05 nm resolution)
  • Amplitude Accuracy: ±0.5 dB
  • Wavelength Accuracy: ±0.05 nm (calibrated)
  • Wavelength Repeatability: ±0.02 nm
  • Measurement Speed: 0.2 seconds (full span, 0.1 nm resolution)
  • Display: 10.4-inch color LCD touchscreen (800 × 600)
  • Interfaces: USB 2.0, LAN (100BASE-TX), GPIB (optional), RS-232C
  • Power Supply: 100–240 V AC, 50/60 Hz
  • Dimensions: 420 × 190 × 450 mm (W × H × D)
  • Weight: Approximately 12 kg
  • Operating Temperature: 5°C to 40°C

Functional Features:

  • Auto-calibration using built-in reference light source
  • PMD measurement capability
  • OSNR measurement (in-band and out-of-band)
  • WDM channel analysis with peak/valley detection
  • Fiber Bragg Grating (FBG) measurement
  • Optical level meter function
  • Pass/Fail judgment with user-defined limits
  • Data export in CSV, TXT, and PDF formats
  • Remote control via SCPI commands over LAN or GPIB

Performance Parameters:

  • Stray Light Suppression: >65 dB
  • Polarization Dependent Loss (PDL) Measurement: ±0.1 dB
  • Optical Input Connector: FC/PC (standard), SC/PC, LC/PC (optional adapters)
  • Maximum Input Power: +20 dBm (with attenuator)
  • Minimum Input Power: -70 dBm (sensitivity limit)

Material Composition:

  • Chassis: Die-cast aluminum alloy
  • Optical bench: Precision machined aluminum with blackened interior
  • Grating: Holographic diffraction grating (gold-coated)
  • Detector: InGaAs photodiode array (for 1200–1700 nm), extended InGaAs (for 1700–2400 nm)
  • Housing: ABS resin with metal shielding

Structural Features:

  • Benchtop form factor with integrated handle
  • Front-panel FC/PC input port
  • Rear-panel ventilation with dust filter
  • Rubber feet for vibration damping
  • Keyboard lock function for production environments

Working Principle:
The AQ6370D uses a monochromator-based design. Incoming light enters through the input port and is collimated by a mirror. A diffraction grating disperses the light spatially by wavelength. The dispersed light is focused onto a two-dimensional InGaAs detector array. Each pixel on the array corresponds to a specific wavelength. The analog signals from the detector are digitized, processed, and displayed as a power-versus-wavelength spectrum. The built-in reference source provides periodic wavelength calibration.

Advantages & Highlights:

  • Widest wavelength coverage in its class (1200–2400 nm)
  • Sub-0.02 nm resolution for detailed spectral analysis
  • 70 dB dynamic range enables measurement of both strong and weak signals simultaneously
  • Fast 0.2-second sweep speed for production-line testing
  • Built-in analysis functions eliminate need for external software
  • SCPI-compatible remote control for automated test systems

Applicable Industries:

  • Telecommunications (fiber optic network deployment and maintenance)
  • Data center interconnect testing
  • Optical component manufacturing (laser, filter, WDM characterization)
  • Research and development laboratories
  • Fiber optic sensor manufacturing
  • CATV and broadcast system testing

Installation Requirements:

  • Place on a stable, level bench away from direct sunlight and vibration sources
  • Ensure at least 100 mm clearance behind the unit for ventilation
  • Connect to a grounded AC power outlet with stable voltage (±10%)
  • Use clean, dry compressed air (if available) to blow dust from optical connectors before connection
  • Connect the LAN cable for remote operation and data transfer

Usage Precautions:

  • Never connect an optical fiber with the transmitter powered on without an attenuator (risk of detector damage)
  • Maximum input power must not exceed +20 dBm without an inline attenuator
  • Clean all optical connectors with lint-free wipes and isopropyl alcohol before each use
  • Allow 15 minutes warm-up time for wavelength accuracy to stabilize
  • Do not open the chassis; internal optical alignment is factory-set
  • Store in a dry environment with desiccant packs to prevent detector degradation

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