Agilent/Keysight 11890A

The Agilent/Keysight 11890A is a three-port, single-direction lightwave directional coupler engineered for fiber optic test and measurement applications. It separates forward and reverse traveling waves, enabling reflection measurements and transmission signal monitoring within optical systems. The device couples optical signals at a nominal 3 dB coupling factor (50% coupling) across the 1270–1600 nm wavelength range. Built with rugged packaging for demanding environments, the 11890A integrates readily with HP Lightwave Component Analyzers and other compatible test instrumentation.

– Technical Specifications

• Product Type: Lightwave Directional Coupler
• Ports: Three-port
• Coupling Mechanism: Single-direction coupling
• Coupling Factor: 3 dB nominal (50% coupling)
• Wavelength Range: 1270–1600 nm
• Fiber Type: Single-Mode Fiber (SMF), 9/125 µm
• Optical Connector Interface: PC (81000xI Series connectors sold separately)

– Key Features

• Separates forward and reverse traveling optical waves in a single direction
• Nominal 3 dB coupling factor enables precise signal branching
• Operates across C-band and L-band wavelengths (1270–1600 nm)
• Compatible with standard single-mode fiber (9/125 µm)
• Rugged construction for field and laboratory deployment

– Typical Applications

• Reflection and return-loss measurements in optical systems
• Transmission signal monitoring and diagnostics
• Integration with component analyzer platforms
• Directional signal separation in lightwave test setups

– Compatibility & Integration

The 11890A operates with HP Lightwave Component Analyzers and other suitable test equipment. Optical connectivity requires PC-interface connectors from the 81000xI Series, available separately. The coupler accommodates standard 9/125 µm single-mode fiber, ensuring compatibility with prevalent fiber optic infrastructure.