Agilent/Keysight 81618A Fabry-Perot Laser Source Module

The Agilent/Keysight 81618A is an optical head interface module that bridges 8162x series optical heads to Keysight 816x series lightwave measurement mainframes. This single-channel interface enables integrated optical signal characterization by connecting external optical heads—which may contain laser sources or sensors—to compatible mainframes such as the 8163A/B, 8164A/B, or 8166A/B. The module does not contain an internal laser source; instead, it provides the interface layer for external optical components within Keysight’s Lightwave Solution Platform.

– Technical Specifications

• Module Type: Optical Head Interface Module
• Channels: 1
• Dimensions: 12.4 in. length × 1.25 in. width × 2.7 in. height
• Weight: 1 lb
• Operating Temperature: 0 °C to 40 °C
• Storage/Shipping Temperature: -40 °C to +70 °C
• Relative Humidity: Maximum 80%
• Altitude: Up to 2000 meters
• Analog Output: 0 to 2 V (proportional to optical input power; 2 V corresponds to full power)
• Analog Output Connector: BNC

– Key Features

• Single-channel optical head interface optimized for 8162x series optical heads
• Direct analog output via BNC connector with fixed 2 V full-scale capability
• Autoranging support with option to disable for consistent voltage scaling
• Front panel status indicators for connected optical head operation
• Designed for insertion into compatible Keysight mainframes; mainframe supplies all operating power
• Requires AC mains connection to mainframe with proper grounding to prevent shock hazards

– Typical Applications

• Optical signal power measurement and monitoring
• Integration of external optical heads into automated measurement systems
• Lightwave characterization within multi-module test configurations

– Compatibility & Integration

The 81618A connects 8162x series optical heads to Keysight 816x series mainframes including the 8163A/B, 8164A/B, and 8166A/B. All power is derived from the installed mainframe. Laser source modules connected through compatible optical heads may require 20–60 minute warm-up periods for stabilization. Operation with appropriate safety interlocks is mandatory.