The HP 70951A is a diffraction-grating-based optical spectrum analyzer designed as a plugin module for the HP 70004A mainframe. It delivers precise spectral analysis of optical signals across the 600 nm to 1700 nm wavelength range, measuring optical power versus wavelength with high accuracy and dynamic range. The instrument integrates a unique double-pass monochromator architecture that combines single-monochromator sensitivity with double-monochromator dynamic range while maintaining polarization insensitivity. When paired with the HP 70004A mainframe, it forms the HP 71451A system, enabling high-speed digital communication and computer control via MSIB and GPIB interfaces.
Technical Specifications
• Wavelength Range: 600 nm to 1700 nm
• Wavelength Accuracy: ±1 nm
• Wavelength Linearity: ±0.05 nm (spans 0.5 nm)
• Dynamic Range: 60 dB
• Sensitivity: −85 dBm
• Polarization Dependency: ±2.5 dB (600–1700 nm)
• Memory: 1 Mbyte total; non-volatile storage for up to 10 user-definable setups
– Key Features
• Double-pass monochromator design optimizing sensitivity and dynamic range
• Five operational modes for flexible measurement scenarios
• FC/PC connectors standard; optional FC/APC interface (HP 81000NI)
• TTL-compatible external trigger input (0 V to +5 V)
• Rear-panel analog output for photocurrent measurement
• ADC sync connector for external event synchronization
• Optional programmable current source (Option 001)
– Typical Applications
• Characterization of optical components, amplifiers, LEDs, DBF lasers, and Fabry-Perot lasers
• Spectral analysis in optical laboratories and fiber-optic communication systems
• High-resolution optical power distribution measurements
– Compatibility & Integration
• Operates as a plugin module for the HP 70004A mainframe
• Integrates into the HP Modular Measurement System (MMS) via MSIB and GPIB
• Standard FC/PC interface connectors; alternative connectors available separately
