Service & Repair of HP 70951B Optical Spectrum Analyzer OSA

The HP 70951B is a diffraction-grating-based optical spectrum analyzer module designed for spectral measurements of optical power versus wavelength across the 600 to 1700 nm range. It characterizes optical components, amplifiers, LEDs, DFB lasers, and Fabry-Perot lasers with high wavelength accuracy and excellent amplitude fidelity. The module integrates into the HP 71451B Optical Spectrum Analyzer System and the 70000 Modular Measurement System, requiring installation in either an HP 70004A display or HP 70001A mainframe.

– Technical Specifications

• Wavelength Range: 600 to 1700 nm
• Wavelength Accuracy: ±1 nm; ±0.3 nm absolute; ±0.9 dB after user calibration
• Wavelength Linearity: ±0.05 nm for spans 50 dB greater than ±1 nm)
• Resolution Accuracy: ±30% (600 to 1700 nm)
• Sweep Time: 40 nm/50 ms
• Sensitivity: −90 dBm; −95 dBm (1250 to 1600 nm)
• Amplitude Accuracy: +0.1/−0.05 dB with external photodetector; +0.2/−0.1 dB with internal photodetector after user calibration
• Flatness: ±0.4 dB (1250 to 1600 nm); ±2 dB (900 to 1700 nm) for ≥2 dBm input
• Polarization Dependency: ±2.5 dB (600 to 1700 nm)
• Maximum Input: 610 V, 610 mA at rear-panel TRANS-Z INPUT connector

– Key Features

• Selectable input connectors for monochromator or photodetector configuration
• Front-panel and remote HP-IB control with addressable configuration
• 4/8-width modular form factor
• Low polarization dependency across full wavelength range

– Typical Applications

• Optical component and amplifier characterization
• LED and laser spectral analysis (DFB and Fabry-Perot types)
• Stimulus-response measurements via monochromator or photodetector inputs

– Compatibility & Integration

Installs in HP 70004A display or HP 70001A mainframe as a component of the 70000 Modular Measurement System. Operates as part of the HP 71451B Optical Spectrum Analyzer System.