Anritsu MS9720A – Optical Spectrum Analyzer

The Anritsu MS9720A is a portable optical spectrum analyzer for precise measurement of optical signals across the C-band and L-band wavelengths. It delivers high sensitivity and wavelength accuracy suitable for WDM system commissioning, maintenance, and troubleshooting in fiber optic networks. The instrument uses diffraction grating dispersion to resolve and measure individual wavelength channels with 5 pm read resolution and 1 pm display resolution.

Technical Specifications

Wavelength Measurement

• Measurement range: 1450 to 1650 nm


• Accuracy: ±20 pm (1530–1570 nm after calibration), ±0.3 nm (full range after calibration)


• Read resolution: 5 pm


• Display resolution: 1 pm


• Stability: ±5 pm (11-point smoothing, 1 minute)


• Setting resolution (3 dB filter bandwidth): 0.1, 0.2, 0.5, 1.0 nm Level Measurement


• Measurement range: −87 to +10 dBm (1450–1600 nm, 0–30 °C); −72 to +10 dBm (1600–1650 nm, 0–30 °C)


• Accuracy: ±0.4 dB (at 1550 nm, −23 dBm)


• Dynamic range: 58 dB (1 nm from peak), 53 dB (0.5 nm from peak)


• Flatness: ±0.1 dB (1550 ±20 nm)


• Stability: ±0.02 dB (1 minute, constant temperature) Reception & Source


• Optical reception sensitivity: −87 dBm


• Built-in SLD source output: >−40 dBm/nm (at 1550 nm)


• Optical return loss: 35 dB (at 1550 nm) Display & Memory


• Display: 6.4-inch color TFT-LCD with split-screen capability


• Measurement memories: three


• Traces: three Interfaces & Storage


• Communication: GPIB, RS-232C, VGA output


• Data storage: 3.5-inch FDD and HDD Optical Connectors


• User replaceable: FC, SC, ST, DIN, HMS-10/A


• Factory options: E2000, FC-APC, SC-APC, HRL-10


• Applicable fiber: 10/125 μm SM (ITU-T G.652) Power


• Input: Universal 85–132 Vac / 172–250 Vac, 47.5–63 Hz


• Consumption: 150 VA (max.)

Key Features

• High wavelength accuracy after calibration for precise channel identification


• Three independent measurement traces with difference computation


• Internal optical attenuator extends level measurement range to +23 dBm


• Interchangeable connectors accommodate diverse field installations


• Built-in SLD reference source eliminates external light source dependency

Typical Applications

• WDM system performance verification and acceptance testing


• Optical signal monitoring and channel power measurement


• Wavelength calibration and drift detection


• Fiber plant commissioning and maintenance


• Network troubleshooting and spectral analysis

Compatibility & Integration The MS9720A accepts standard SMF connectors and integrates with test control systems via GPIB and RS-232C interfaces. Measurement data export to floppy and hard disk enables post-processing and archival workflows.