The Agilent/Keysight 81624A is an InGaAs optical power head engineered for precise optical power measurements across the near-infrared spectrum. It delivers measurement accuracy as low as ±2.2% at reference conditions (1000 nm to 1630 nm) with exceptional linearity of ±0.02 dB in the CW range from +10 dBm to -70 dBm. The large area 5 mm diameter InGaAs detector provides low polarization dependent loss, low spectral ripple, and high return loss—critical performance metrics for optical component testing and characterization in demanding measurement environments.
Technical Specifications
• Sensor Type: Large area InGaAs detector
• Detector Diameter: 5 mm
• Wavelength Range: 800 nm to 1700 nm
• Power Range: +10 dBm to -90 dBm
• Measurement Accuracy: ±2.2% (1000 nm to 1630 nm at reference conditions)
• Linearity: ±0.02 dB (CW, +10 dBm to -70 dBm)
• Fiber Compatibility: Standard single-mode and multimode (max. 100 µm core, NA < 0.3)
– Key Features
• Low polarization dependent loss minimizes measurement errors in polarization-sensitive applications
• Low spectral ripple ensures flat response across the operating wavelength range
• High return loss reduces reflective errors from the detector interface
• Wide dynamic range from +10 dBm to -90 dBm supports both high-power and ultralow-power measurements
• 5 mm active area accommodates both single-mode and multimode fiber coupling
– Typical Applications
• Optical component characterization and validation
• In-service optical power monitoring
• Wavelength-dependent power profiling (800 nm to 1700 nm)
• Low-loss optical system testing
– Compatibility & Integration
The 81624A connects to the Agilent 81618A (single-channel) or 81619A (dual-channel) interface modules, which integrate into Agilent optical mainframes: 8163A/B, 8164A/B, and 8166A/B. This modular architecture enables flexible multi-head measurement configurations within a single chassis.
