The Keysight 81623B Optical Power Head is a germanium-based detector for precision optical power measurements across the near-infrared spectrum. This remote sensor head integrates with Keysight’s 816xA/B Lightwave Mainframes via 81618A or 81619A interface modules, enabling flexible positioning for component characterization, laser analysis, and amplifier testing in telecommunications and research applications. The 5 mm germanium detector delivers calibrated accuracy across distinct wavelength bands, with polarization-insensitive performance and real-time data acquisition capabilities including automated ranging and extended logging.
Technical Specifications
• Sensor Element: Germanium (Ge)
• Detector Diameter: 5 mm
• Wavelength Range: 750 nm to 1800 nm
• Power Range: +10 dBm to -80 dBm
• Detector for Fiber NA: Up to 0.3
• Detector for Open Beams: Up to 5 mm diameter
• Calibration Uncertainty (800–1000 nm): ±2.5%
• Calibration Uncertainty (1000–1650 nm): ±1.7%
• Relative Uncertainty (Polarization): Typically <±0.01 dB (typical <±0.005 dB)
• Relative Uncertainty (Spectral Ripple): Typically <±0.006 dB (typical <±0.003 dB)
• Averaging Time: 100 µs to 10 s
• Data Logging Capacity: Up to 20,000 samples
• Analog Output: 0–2 V via BNC connector
• Dimensions: 55 mm (H) × 80 mm (W) × 250 mm (D)
• Weight: 0.9 kg (without heat sink)
– Key Features
• Automatic power ranging with min/max monitoring
• Magnetic D-shaped connector adapters for quick optical input switching
• Accepts 81000xI connectors, bare fiber adapters, and threaded adapters with removable ring
• Analog output proportional to optical signal (requires autoranging disabled for stable DC level)
• Operating temperature range per mainframe specifications; maximum 80% relative humidity (non-condensing); rated to 2000 m altitude
– Typical Applications
• Optical component characterization and wavelength-dependent power analysis
• Laser and optical amplifier measurement in telecommunications
• Research-grade spectral power profiling from 750 nm to 1800 nm
– Compatibility & Integration
• Compatible Mainframes: Keysight 8163A/B, 8164A/B, 8166A/B Lightwave Mainframes
• Interface Modules: 81618A (single-channel) or 81619A (dual-channel)
• Connector Support: MT ribbon fiber connectors and bare fiber clamps available
