HP 81533A Optical Head Interface

The HP 81533A Optical Head Interface is a single-slot module for HP and Agilent lightwave multimeter mainframes that enables connection of compatible optical heads for precision optical power measurement. It provides analog signal output via BNC connector and integrates with the 8153A, 8163A, and 8164A series mainframes to deliver measurements across UV to near-infrared wavelengths with 0.001 dBm resolution.

– Technical Specifications

• Wavelength Range: 450 nm to 1020 nm (with compatible optical heads)
• Power Range: +10 dBm to −100 dBm (with compatible optical heads)
• Power Resolution: 0.001 dBm or 0.1 pW (with compatible optical heads)
• Measurement Uncertainty: ±2.2% at reference conditions (with compatible optical heads)
• Linearity: +3 dBm to −80 dBm (with compatible optical heads)
• Noise Floor: <50 pW (with compatible optical heads)
• Operating Temperature: 0°C to +40°C
• Analog Output Interface: BNC connector
• Module Dimensions: 12.4 in. × 1.25 in. × 2.7 in.
• Weight: 0.45 kg (1.0 lb)

– Key Features

• Single-channel optical head interface with BNC analog output
• Supports parallel beam fiber types from 9/125 µm to 100/140 µm with numerical aperture <0.3
• High dynamic range measurement from +10 dBm to −100 dBm enables characterization of weak optical signals and high-power sources
• Sub-picowatt noise performance maintains signal fidelity across the full measurement range
• Compact single-slot module design integrates into standard lightwave multimeter chassis

– Compatibility & Integration

The 81533A operates as a plug-in module within HP 8153A, 8163A, and 8164A mainframes. Compatible optical heads include the HP 81521B and HP 81524A, which define the actual wavelength coverage, power range, and measurement characteristics of the complete system. The analog BNC output enables real-time signal monitoring and external data acquisition integration.