HP / Agilent 81624A InGaAs Optical Head, 5mm Diameter

The HP/Agilent 81624A is an InGaAs optical sensor head designed for optical power measurement across the telecommunications and photonics spectrum. Built around a 5 mm diameter large area InGaAs detector, it delivers accurate power readings from +10 dBm to −90 dBm across 800 nm to 1700 nm. The sensor achieves ±2.2% measurement uncertainty at reference conditions (−20 dBm, 1000–1630 nm range) with linearity as low as ±0.02 dB, making it suitable for precision lightwave applications requiring minimal polarization and spectral effects.

– Technical Specifications

• Sensor Type: Large Area InGaAs
• Detector Diameter: 5 mm
• Wavelength Range: 800 nm to 1700 nm
• Power Range: +10 dBm to −90 dBm
• Measurement Uncertainty (−20 dBm, 1000–1630 nm): ±2.2%
• Linearity: ±0.02 dB
• Low Polarization Dependent Loss (PDL)
• Low Spectral Ripple
• High Return Loss
• Single Channel Configuration
• No Analog Output

– Key Features

• 5 mm aperture diameter optimized for large-area signal collection
• Extended wavelength coverage from 800 nm through 1700 nm
• Wide dynamic range spanning 100 dB of optical power
• Exceptional measurement accuracy and repeatability in the 1000–1630 nm telecommunications window
• PDL and spectral ripple characteristics controlled for precision applications
• Includes magnetic D-shape adapter for convenient mounting

– Typical Applications

• Optical power measurement in fiber-optic communication systems
• Lightwave component characterization and testing
• Photonics research requiring broadband NIR/SWIR detection
• System-level validation of optical power budgets

– Compatibility & Integration

The 81624A interfaces with HP/Agilent lightwave mainframes through dedicated interface modules: single-channel (Agilent 81618A) or dual-channel (Agilent 81619A) configurations. Compatible mainframe models include 8163A/B, 8164A/B, and 8166A/B. Connector adapter options support FC/PC, SC/PC, E-2000, ST/PC, and LC/PC terminations.