Yokogawa AQ6377 1900-5500nm Optical Spectrum Analyzer

The Yokogawa AQ6377 is a optical spectrum analyzer for precise characterization across the 1900–5500 nm wavelength range. Using dispersive spectroscopy, it delivers measurements from –60 dBm to +13 dBm with 50 dB close-in dynamic range and wavelength accuracy of ±0.5 nm. The instrument features a free-space optical input for high coupling efficiency and maintenance-free operation, an integrated gas purge system to suppress water vapor absorption, and a built-in cut filter that removes high-order diffraction below 1500 nm.

Wavelength resolution spans 0.2 nm to 5 nm across selectable display modes: wavelength (nm), frequency (THz), or wave number (cm⁻¹). Applications include environmental sensing, medical diagnostics, gas analysis, quantum cascade laser characterization, and advanced photonic research.

Technical Specifications

• Wavelength Range: 1900 nm to 5500 nm


• Wavelength Resolution: 0.2 nm to 5 nm (selectable)


• Wavelength Accuracy: ±0.5 nm


• Level Range: –60 dBm to +13 dBm


• Dynamic Range (Close-in): 50 dB


• Horizontal Scale Modes: Wavelength (nm), Frequency (THz), Wave Number (cm⁻¹)


• Wavelength Reference: Integrated acetylene absorption calibration with 0.6 picometer precision

Key Features

• Free-Space Optical Input: Eliminates internal fiber maintenance; accepts both single-mode and multi-mode fibers with /PC or /APC connectors


• Double Speed Mode: Increases sweep speed up to 2× standard rate with 2 dB sensitivity penalty


• Gas Purge System: Nitrogen purging through dedicated ports reduces atmospheric water vapor effects


• Cut Filter: Suppresses incoming light below 1500 nm to eliminate high-order diffracted light


• Level Fluctuation Measurement: Tracks intensity variations over time at specific wavelengths for optical alignment and stability assessment


• Built-in Calibration: Requires no external calibration equipment

Optical Input & Integration

• Fiber-optic coupling via /PC or /APC connectors to both single-mode and multi-mode fibers


• Free-space design ensures measurement repeatability without connector-induced losses


• HIGH1–3 sensitivity modes for extended dynamic range measurements