The Agilent/Keysight 81620C Optical Power Head is a precision measurement component featuring a large-area silicon detector optimized for optical power characterization across visible and near-infrared wavelengths. It integrates with the Keysight N7749C Optical Head Interface to enable flexible remote measurement in telecommunications, research, and manufacturing environments. The detector accepts parallel beams up to 4 mm diameter and is compatible with standard single-mode and multimode fiber (core ≤100 µm, NA ≤0.3), as well as open-beam applications via optional adapters.
Technical Specifications
• Detector: Silicon (Si), 5 mm diameter
• Wavelength Range: 450 nm to 1020 nm (specified 600 nm to 1020 nm)
• Power Measurement Range: –90 dBm to +10 dBm
• Maximum Safe Input Power: +16 dBm (CW and peak)
• Minimum Averaging Time: 100 µs
• Beam Input: Parallel beams up to 4 mm diameter; compatible with SM and MM fiber (core ≤100 µm, NA ≤0.3)
• Analog Output: 0 to 2 V (BNC connector), proportional to optical power. Configurable as linear or logarithmic scaling. Requires autoranging disabled for consistent output.
• Data Buffering: Dual 1 M sample buffers per head with internal or external triggering
– Key Features
• Low-noise performance optimized for 850 nm measurements
• SCPI command set compatibility with Keysight optical power meters
• LAN and USB interfaces with built-in web-browser GUI
• Family-wide synchronized trigger architecture
• Rapid magnetic D-shaped adapters for fiber connector types and bare fibers
– Typical Applications
Optical power characterization in fiber-optic networks, photonics research, component manufacturing, and field testing requiring stable, low-noise measurements across the visible to near-infrared spectrum.
– Compatibility & Integration
Designed for operation with the Keysight N7749C Optical Head Interface. Also compatible with 8162-B and 8162-C series optical heads.
