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 Status: obsolete; technical support availability may vary.
