Agilent/Keysight 81511A – Optical Head

The Agilent/Keysight 81511A is an optical head designed for integration with Agilent/Keysight 8151A Optical Pulse Power Meters and compatible interface modules. It performs accurate power measurements across fiber optic communication systems, supporting peak power, average power, and extinction ratio characterization for component testing, system verification, and manufacturing quality control.

– Technical Specifications

• Wavelength Range: 550 nm to 950 nm; factory calibrated for 850 nm
• Maximum Core Diameter: 200 µm
• Measurement Range: +10 dBm to −60 dBm
• Resolution: 3 digits (Watts) with 1 pW minimum; 4 digits (dB) with 0.01 dB minimum
• Accuracy: ±2.5%
• Dimensions: 60 mm (H) × 96 mm (W) × 200 mm (D)
• Weight: 1.3 kg net; 2 kg shipping
• Operating Temperature: 0°C to +55°C
• Storage Temperature: −40°C to +70°C
• Humidity Rating: 95% RH from 0°C to +40°C

– Key Features

• Peak and average power measurements for digital and non-repetitive signal evaluation
• Median power and amplitude measurement capability
• Extinction ratio measurement for on/off state signal analysis
• O/E transducer functionality
• HP-IB interface support (functions: SH1, AH1, T6, L4, SR1, RL1, PPO, DC1, DT1, CO)
• Calibration grid indicates correction factors for wavelengths outside 850 nm primary calibration
• Supports multiple fiber connector types and bare fiber configurations

– Typical Applications

• Fiber optic component and module characterization
• Digital optical signal threshold and amplitude assessment
• Optical system verification and performance validation
• Manufacturing quality control for fiber optic assemblies

– Compatibility & Integration

The 81511A integrates with the 8151A Optical Pulse Power Meter mainframe and supports the Agilent 81618A (single-channel) and 81619A (dual-channel) interface modules. Legacy support extends to Keysight N7749C platforms. Connector adapters accommodate standard Diamond HMS-10 fiber optics and optional NEC/D3 (FC) configurations.