Yokogawa AQ6376E 1500-3400nm Optical Spectrum Analyzer

The Yokogawa AQ6376E is a bench-top optical spectrum analyzer covering 1500–3400 nm, extending into the Mid-Wave Infrared region. It delivers high-accuracy wavelength measurements, exceptional sensitivity down to −65 dBm, and a 78 dB measurement dynamic range. The instrument supports both free-space and fiber-coupled inputs (single-mode and multimode up to 400 µm) and executes full-span sweeps in as little as 0.5 seconds using Double Speed Mode.

Built-in gas purging, cut filtering, and fast auto-calibration eliminate common measurement artifacts. Advanced Pulsed Light Measurement capability and a double-pass monochromator design enable precise characterization of environmental gases (COx, NOx, CxHy), laser sources, and infrared optical components in R&D and manufacturing environments.

Technical Specifications

• Wavelength range: 1500–3400 nm


• Wavelength accuracy: ±0.5 nm


• Wavelength resolution: 0.1 nm


• Close-in dynamic range: 55 dB


• Measurement dynamic range: 78 dB


• Level sensitivity: −65 dBm


• Optical input: Free-space and fiber-coupled (single-mode, multimode to 400 µm)


• Sweep time: 0.5 seconds minimum (100 nm span, Double Speed Mode)


• Double-pass monochromator for high resolution and dynamic range

Key Features

• Double Speed Mode for up to 2× faster sweep performance


• Advanced Pulsed Light Measurement (APLM) mode


• Gas purging ports to reduce water vapor absorption


• Built-in cut filter for high-order diffraction suppression


• Fast auto-calibration with internal reference source (<2 minutes)


• 55 dB close-in dynamic range for signal separation


• Large touchscreen display for intuitive operation


• Built-in parameter analysis for automatic device characterization


• Ethernet interface for high-speed data transfer

Typical Applications

• Environmental gas sensing and monitoring (COx, NOx, hydrocarbons)


• Laser spectroscopy and source characterization


• Optical device and component testing in the infrared


• Manufacturing quality assurance for infrared optical systems

Compatibility & Integration Accepts single-mode and multimode fiber inputs up to 400 µm diameter. Supports external reference sources for wavelength calibration. Ethernet connectivity enables rapid remote measurement and data logging.