Agilent/Keysight 70951B – Optical Spectrum Analyzer Module

The Keysight 70951B is an optical spectrum analyzer module engineered for precise power-versus-wavelength measurements across the 600 nm to 1700 nm range. This component integrates into the 70000 Modular Measurement System, requiring a compatible mainframe such as the HP 70004A display or HP 70001A. The module occupies a 4/8-width slot and delivers exceptional sensitivity down to –90 dBm with a 60 dB dynamic range, making it ideal for characterizing optical components, amplifiers, lasers, and EDFA systems.

Technical Specifications

Wavelength and Resolution

• Wavelength range: 600 nm to 1700 nm


• Span range: 0.2 nm to full range, continuously variable


• Resolution bandwidth (FWHM): <0.08 nm and 0.1 to 10 nm in 1,2,5 sequence


• FWHM setting: <0.065 nm ±15% Performance Metrics


• Sensitivity: –90 dBm (1200 to 1600 nm range)


• Dynamic range: 60 dB


• Wavelength accuracy (absolute): ±0.3 nm


• Span linearity: ±0.05 nm for spans <40 nm


• Reproducibility (1 minute): ±0.005 nm


• Maximum sweep rate: 40 nm/50 ms


• Monochromator: Double-pass design Polarization Performance


• Polarization dependency at ≥0.2 nm resolution (1250–1600 nm): ±0.5 dB


• Polarization dependency at ≥0.2 nm resolution (700–1600 nm): ±1.5 dB


• Polarization dependency at ≥0.2 nm resolution (600–1700 nm): ±2.5 dB

Key Features

• Double-pass monochromator enables superior spectral resolution and dynamic range


• Real-time sweep capability with maximum rate of 40 nm/50 ms


• Low polarization dependency across extended wavelength bands


• Excellent wavelength reproducibility and span linearity


• Optimized sensitivity configuration for EDFA testing applications

Input/Output & Operating Conditions Connectors

• Optical input: FC/PC monochromator and photodetector inputs


• Optical output: 62.5 µm fiber connector (other adapters available) Environmental


• Operating temperature: 0°C to +55°C


• Storage temperature: –40°C to +71°C


• Humidity: <95% R.H. (noncondensing)


• Maximum input power (monochromator): +30 dBm total


• Maximum input power (photodetector): +20 dBm

Compatibility & Integration The 70951B module integrates exclusively within the Keysight 70000 Modular Measurement System. Requires HP 70004A display or HP 70001A mainframe. Status: obsolete; technical support availability may vary.