The HP/Agilent 81622B is a Germanium optical sensor head designed for precision optical power measurement across the infrared spectrum. This 5 mm diameter detector integrates with Agilent optical power meter systems via interface modules such as the 81618A or 81619A, delivering accurate readings from 850 nm to 1650 nm. The sensor achieves ±3.0% accuracy across 950 nm to 1630 nm and offers exceptional linearity of ±0.05 dB ±40 nW in the 950–1630 nm band. Built for demanding laboratory and industrial applications, the 81622B accepts standard single-mode and multi-mode fiber up to 100 µm core diameter (NA = 0.3) and delivers 0.001 dB power resolution with ±0.02 dB repeatability.
## Technical Specifications
• Sensor Element: Germanium (Ge)
• Optical Diameter: 5 mm
• Wavelength Range: 850 nm to 1650 nm
• Power Measurement Range: +27 dBm to −55 dBm (1250–1650 nm); +23 dBm to −55 dBm (850–1650 nm)
• Measurement Accuracy: ±3.0% (950–1630 nm)
• Linearity (CW, 23°C ±5°C): ±0.05 dB ±40 nW (+27 dBm to −40 dBm, 950–1630 nm)
• Power Resolution: 0.001 dB
• Measurement Repeatability: ±0.02 dB
• Noise (peak-to-peak): < 40 nW
• Polarization Dependence: 45 dB
• Maximum Input Power: 300 mW
• Optical Damage Threshold: 500 mW/cm²
• Analog Output: 0–2 V via BNC connector
## Key Features
• Germanium detector optimized for near-infrared and infrared wavelengths
• Supports standard single-mode and multi-mode fiber (core up to 100 µm, NA = 0.3)
• Real-time analog output for instantaneous signal monitoring
• High return loss (> 45 dB) minimizes reflective artifacts
• Compact 80 × 42 × 190 mm form factor; 0.4 kg
## Typical Applications
• Optical power measurement in fiber optic systems
• Infrared detector calibration and validation
• Laboratory characterization of broadband and narrowband sources
• Industrial optical power monitoring
## Compatibility & Integration
The 81622B integrates with Agilent optical power meter platforms via the 81618A or 81619A interface modules. Optical input adapts to common fiber connectors (FC/PC, SC, ST) or bare fiber through available connector adapters. Threaded or D-type magnetic interface options are available depending on model variant.
