Advantest Q8344A 350nm-1750nm Optical Spectrum Analyzer

The Advantest Q8344A is a benchtop optical spectrum analyzer spanning 350 nm to 1750 nm, engineered around Fourier spectrum analysis using a Michelson interferometer. This architecture enables direct optical coherence length measurements - a capability absent in monochromator-based instruments. The analyzer delivers wavelength resolution to 0.05 nm at 0.85 µm, wavelength accuracy of ±0.1 nm, and measurement speeds of approximately 1.5 seconds per sweep across any analysis span.

Dynamic range reaches 80 dB with input sensitivity from −70 dBm to +10 dBm across the 0.7 µm to 1.6 µm band. A built-in He-Ne laser reference ensures long-term measurement repeatability without external calibration.

Technical Specifications

• Wavelength Range: 350 nm to 1750 nm


• Measurement Principle: Fourier spectrum analysis; Michelson interferometer


• Wavelength Resolution: 0.05 nm maximum (at 0.85 µm); 0.1 nm (at 1.31 µm)


• Wavelength Accuracy: ±0.1 nm (at 1.3 µm, vacuum reference)


• Measurement Speed: ~1.5 seconds per sweep


• Span Range: 0.1 nm to 140 nm/DIV


• Input Sensitivity: −70 dBm to +10 dBm (0.7 µm to 1.6 µm)


• Level Accuracy: ±2.0 dB or less (at 0.85 µm and 1.31 µm)


• Linearity: ±1.0 dB/25 dB or less; ±0.5 dB/10 dB or less


• Dynamic Range: 80 dB


• Reference: Built-in He-Ne laser

Key Features

• Direct coherence length measurement capability via Michelson interferometer architecture


• Fiber input: 50 µm standard; optional 200 µm available


• Manual transportation lock on interferometer mechanism


• GP-IB interface for instrument control


• Optional built-in printer (Option 01)


• Horizontal orientation required; 10 cm minimum clearance around air vents

Typical Applications

• Laser diode characterization in optical data storage systems


• Fiber optic gyroscope laser evaluation


• LED and photoemitting element analysis


• Telecommunications and data communications component testing


• Optical device manufacturing quality assurance

Compatibility & Integration Benchtop form factor with GP-IB interface support. Operates in controlled environments free from thermal transients, mechanical shock, vibration, moisture, dust, and external magnetic fields.