Anritsu MS9720B – Optical Spectrum Analyzer

The Anritsu MS9720B is a optical spectrum analyzer engineered for precise characterization of optical devices and WDM systems. Operating across the C-band, it delivers 58 dB dynamic range, -87 dBm sensitivity, and 0.03 nm minimum resolution bandwidth for detailed spectral analysis. Built-in acetylene calibration and an integrated SLD light source enable automated wavelength accuracy to ±20 pm, while multi-channel WDM analysis, NF measurement, PMD calculation, and SMSR capabilities address demanding R&D, manufacturing, and quality control workflows in optical communications. ## Technical Specifications Wavelength Performance • Wavelength range: 1450 nm to 1650 nm • Wavelength accuracy: ±20 pm (1530–1570 nm with reference source) • Minimum resolution bandwidth: 0.03 nm • Dynamic range: 58 dB at 1 nm from signal • Optical sensitivity: -87 dBm • Maximum input level: +30 dBm (attenuator ON) Internal Light Source • Type: SLD (Super Luminescent Diode) • Output spectrum: 1450 nm to 1650 nm • Output level: -40 dBm minimum (1 nm RBW at 1550 nm) Measurement Functions • WDM analysis: Up to 128 channels with peak wavelength, level, and SNR per channel • NF measurement: ASE calculation using interpolation and level-fitting methods • PMD calculation: Fixed-analysis function for Polarization Mode Dispersion • SMSR measurement: Signal-to-Modulation Side-Band Ratio analysis System Interface • Wavelength calibration: Automatic via acetylene absorption spectrum • Monitor output: VGA connector • Communication: GPIB and RS-232C • Data storage: 3.5-inch floppy disk drive Environmental • Operating temperature: 0°C to +50°C • Storage temperature: –20°C to +60°C • Relative humidity: ≤90% (non-condensing) • Power: 85–132 Vac / 172–250 Vac, 47.5–63 Hz, 150 VA max • Dimensions: 320 (W) × 177 (H) × 350 (D) mm ## Key Features • Automatic wavelength calibration eliminates manual reference procedures • Integrated SLD source simplifies benchtop deployment and reduces external component requirements • 58 dB dynamic range resolves weak sidebands and noise floor analysis in complex spectra • Sub-0.1 nm resolution bandwidth enables detailed modulation sideband characterization ## Typical Applications • WDM system development and channel verification across C-band • Optical amplifier performance assessment and ASE noise profiling • Laser and light source spectral purity validation • Transmission system commissioning and field troubleshooting ## Compatibility & Integration GPIB and RS-232C interfaces enable automated test sequences and remote instrument control. Legacy data archival through floppy disk drive supports legacy workflows; measurement files integrate with instrument automation platforms via standard communication protocols.