Advantest Q8347 350nm-1750nm Optical Spectrum Analyzer

The Advantest Q8347 is a Michelson interferometer–based optical spectrum analyzer engineered for high-resolution spectral characterization across 350 nm to 1750 nm. It delivers wavelength accuracy to ±0.01 nm in high-resolution mode and dynamic range exceeding 35 dB, making it suitable for precise evaluation of light sources, passive optical components, WDM transmission systems, and ultra-high-speed optical channels. Measurement speeds reach 1 second in normal mode and 2.5–3.5 seconds in high-resolution configurations.

The instrument provides multiple analysis modes including curve fitting (sech² and Gaussian), trend monitoring, spectral-width calculation, and 3-D display.

Technical Specifications

• Wavelength Range: 350 nm to 1750 nm


• Measurement Range: −72 dBm to +10 dBm (1.2–1.6 µm); −65 dBm to +10 dBm (0.7–1.6 µm); −52 dBm to +10 dBm (0.45–1.7 µm); −42 dBm to +10 dBm (0.35–1.75 µm)


• High-Resolution Mode: 0.001 nm @ 500 nm, 0.003 nm @ 0.85 µm, 0.007 nm @ 1550 nm, 1 GHz optical frequency mode


• Normal Mode: 0.1 nm @ 1.55 µm, 0.05 nm @ 0.85 µm


• Wavelength Accuracy: ±0.01 nm (high-resolution), ±0.1 nm (normal)


• Level Accuracy: ±1.0 dB @ 780 nm; ±0.7 dB @ 1310/1550 nm (−10 dBm input)


• Linearity: ±0.1 dB/−20 dB; ±0.5 dB/−30 dB


• Dynamic Range: ≥35 dB


• Measurement Time: 1 second (normal), 2.5 seconds (high-resolution, 0.95–1.75 µm), 3.5 seconds (high-resolution, 0.35–1.05 µm)


• Span: 0.01 nm/DIV to 140 nm/DIV


• Coherence Analysis Range: ±165 mm maximum


• Power Requirements: AC 100–120 V / 220–240 V, 48–66 Hz


• Power Consumption: 180 VA (main unit), 80 VA (optical unit)


• Dimensions: Main unit 424 (W) × 221 (H) × 500 (D) mm

Key Features

• Built-in high-speed thermal printer (8 seconds or less)


• Floppy disk storage (720 KB / 1.2 MB, MS-DOS format)


• GPIB interface for control and data output


• Automatic peak search and normalization (loss/transmission)


• MAX/MIN hold, super impose, and trend monitoring (power, wavelength)


• User-selectable smoothing and averaging


• Color display customization with cursor function

Typical Applications

• WDM transmission system characterization


• Narrow-band optical filter evaluation


• Research and development spectral analysis


• Quality control of optical sources and components

Compatibility & Integration GPIB interface enables remote control and automated data acquisition. Text-format data output supports direct integration with external processing systems and PC-based analysis workflows.