HP / Agilent 81618A Single Optical Head Interface Module

The HP/Agilent 81618A is a single-channel optical head interface module that integrates with 816x mainframe systems to enable precise optical power and wavelength measurements. This interface module provides the necessary connections and control functions to operate compatible 8162x optical heads within HP/Agilent lightwave measurement platforms. Digital data processing supports fiber optic network testing, component characterization, and system integration workflows.

– Technical Specifications

• Channels: 1
• Optical Head Interface Inputs: 1
• Physical dimensions: 12.4 in L × 1.25 in W × 2.7 in H
• Weight: 1 lb
• Digital signal processing; analog output capability depends on connected optical head

– Key Features

• Full compatibility with 8163A/B, 8164A/B, and 8166A/B mainframes
• Supports all 8152x and 8162x series optical heads
• Instantaneous analog signal output when optical heads with analog capability are connected (e.g., 8162xB series)
• Analog output voltage directly proportional to optical signal strength
• Autoranging control on mainframe must be disabled when using analog output to maintain stable voltage reference

– Typical Applications

• Fiber optic network testing
• Optical component characterization
• Lightwave system integration and measurement
• Single-channel power and wavelength monitoring

– Compatibility & Integration

The 81618A interfaces with the 8162x optical head family, including:

• 81620B (Si detector): +10 dBm to −90 dBm
• 81623B (Ge detector): +10 dBm to −80 dBm
• 81624B (5 mm InGaAs): +10 dBm to −90 dBm
• 81625A/B (InGaAs): +27 dBm to −70 dBm
• 81626B (InGaAs): +27 dBm to −70 dBm
• 81628B (InGaAs): +40 dBm to −60 dBm

Operation must comply with the environmental specifications of the host mainframe, including temperature, humidity, and condensation prevention limits.